<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Condenser Microphone Circuit</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 8px;
      user-select: none;
    }
    .diagram-root {
      width: 100%;
      max-width: 620px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .formula-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #f1f5f9;
      border-radius: 6px;
      padding: 8px 12px;
      font-size: 13px;
      font-weight: 600;
      gap: 8px;
    }
    .formula-item {
      display: flex;
      align-items: center;
      gap: 4px;
      white-space: nowrap;
    }
    .val-tag {
      background: #e2e8f0;
      color: #0284c7;
      padding: 2px 6px;
      border-radius: 4px;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 12px;
      font-weight: 700;
    }
    .svg-container {
      width: 100%;
      position: relative;
    }
    svg {
      width: 100%;
      height: auto;
      display: block;
    }
    .controls {
      display: flex;
      gap: 6px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #334155;
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: background-color 0.15s, border-color 0.15s, color 0.15s;
    }
    .btn:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }
    .btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
    }
    .status-text {
      font-size: 12px;
      text-align: center;
      color: #475569;
      font-weight: 500;
      min-height: 20px;
      line-height: 1.4;
      padding: 0 4px;
    }

    @media (max-width: 440px) {
      .formula-bar {
        font-size: 11px;
        padding: 6px 8px;
        gap: 4px;
      }
      .val-tag {
        font-size: 11px;
        padding: 1px 4px;
      }
      .btn {
        padding: 5px 8px;
        font-size: 11px;
      }
      .status-text {
        font-size: 11px;
      }
    }
  </style>
</head>
<body>

<div class="diagram-root">
  
  <div class="formula-bar">
    <div class="formula-item">
      <span>Q = C × V</span>
      <span style="font-size: 10px; color: #64748b;">(const)</span>
    </div>
    <div class="formula-item">
      <span>C = εA / <span id="labelD">d</span></span>
    </div>
    <div class="formula-item">
      <span>Out:</span>
      <span class="val-tag" id="valOut">ΔV = 0.0 V</span>
    </div>
  </div>

  
  <div class="svg-container">
    <svg viewBox="0 0 610 270" aria-label="Condenser Microphone Circuit">
      
      <g stroke="#64748b" stroke-width="2.5" fill="none" stroke-linecap="round" stroke-linejoin="round">
        
        <path d="M 65 190 L 65 65 L 140 65" />
        
        
        <path d="M 140 65 L 146 55 L 158 75 L 170 55 L 182 75 L 194 55 L 206 75 L 212 65" />
        
        
        <path d="M 212 65 L 255 65 L 255 85" />
        
        
        <path d="M 330 205 L 330 235 L 65 235" />

        
        <path d="M 255 65 L 395 65" />

        
        <path d="M 395 53 L 395 77" stroke-width="3" stroke="#334155" />
        <path d="M 403 53 L 403 77" stroke-width="3" stroke="#334155" />
        <text x="399" y="44" font-size="10" font-weight="bold" fill="#64748b" text-anchor="middle">C<tspan font-size="8" dy="2">block</tspan></text>
        <path d="M 403 65 L 475 65" />

        
        <path d="M 65 235 L 65 248" />
        <path d="M 53 248 L 77 248" />
        <path d="M 58 253 L 72 253" />
        <path d="M 62 258 L 68 258" />
      </g>

      
      <g stroke="#0284c7" stroke-width="2.5">
        <line x1="48" y1="190" x2="82" y2="190" stroke-width="3" />
        <line x1="55" y1="200" x2="75" y2="200" stroke-width="2" />
        <line x1="48" y1="210" x2="82" y2="210" stroke-width="3" />
        <line x1="55" y1="220" x2="75" y2="220" stroke-width="2" />
      </g>
      
      <text x="38" y="209" font-size="12" font-weight="bold" fill="#0284c7" text-anchor="end">+48V</text>
      <text x="38" y="222" font-size="9" fill="#64748b" text-anchor="end">Phantom</text>

      
      <text x="176" y="44" font-size="12" font-weight="bold" fill="#475569" text-anchor="middle">R (High-Ω)</text>

      
      <circle cx="480" cy="65" r="4" fill="#0284c7" />
      <circle cx="480" cy="235" r="4" fill="#64748b" />
      <path d="M 330 235 L 476 235" stroke="#64748b" stroke-width="2" stroke-dasharray="4 4" fill="none" />
      <text x="492" y="69" font-size="12" font-weight="bold" fill="#0284c7">Audio Out (ΔV)</text>
      <text x="492" y="239" font-size="11" font-weight="bold" fill="#64748b">0V (GND)</text>

      
      <g id="soundWaves" opacity="0.8">
        <path id="wave1" d="M 210 105 Q 220 145 210 185" stroke="#f59e0b" stroke-width="3" fill="none" stroke-linecap="round" />
        <path id="wave2" d="M 190 100 Q 202 145 190 190" stroke="#f59e0b" stroke-width="2.5" fill="none" stroke-linecap="round" opacity="0.6" />
        <path id="wave3" d="M 170 95 Q 185 145 170 195" stroke="#f59e0b" stroke-width="2" fill="none" stroke-linecap="round" opacity="0.35" />
        
        <text x="190" y="212" font-size="11" font-weight="bold" fill="#d97706" text-anchor="middle">Sound Wave</text>
      </g>

      
      <rect x="230" y="85" width="120" height="120" rx="6" fill="#f1f5f9" stroke="#cbd5e1" stroke-width="1.5" stroke-dasharray="3 3" />

      
      <rect x="315" y="95" width="15" height="100" rx="2" fill="#334155" />
      <text x="322" y="222" font-size="11" font-weight="bold" fill="#334155" text-anchor="middle">Backplate</text>

      
      <path id="diaphragm" d="M 255 95 Q 255 145 255 195" stroke="#eab308" stroke-width="4.5" fill="none" stroke-linecap="round" />
      <text id="diaphragmLabel" x="255" y="222" font-size="11" font-weight="bold" fill="#ca8a04" text-anchor="middle">Diaphragm</text>

      
      <g id="distGroup">
        <line id="distLine" x1="255" y1="145" x2="315" y2="145" stroke="#dc2626" stroke-width="1.5" />
        <line id="guideDiaphragm" x1="255" y1="136" x2="255" y2="154" stroke="#dc2626" stroke-width="1.5" />
        <line x1="315" y1="136" x2="315" y2="154" stroke="#dc2626" stroke-width="1.5" />
        <text id="distText" x="285" y="138" font-size="12" font-weight="bold" fill="#dc2626" text-anchor="middle">d</text>
      </g>
    </svg>
  </div>

  
  <div class="status-text" id="statusText">Resting: Constant distance d → constant capacitance C → ΔV = 0 V</div>

  
  <div class="controls">
    <button class="btn active" id="btnNeutral" onclick="setState('neutral')">1. Rest (d)</button>
    <button class="btn" id="btnComp" onclick="setState('compression')">2. Compression (d ↓)</button>
    <button class="btn" id="btnRare" onclick="setState('rarefaction')">3. Rarefaction (d ↑)</button>
    <button class="btn" id="btnPlay" onclick="toggleAuto()">▶ Auto-Cycle</button>
  </div>
</div>

<script>
  let currentState = 'neutral';
  let autoTimer = null;

  const states = ['neutral', 'compression', 'rarefaction'];
  const data = {
    neutral: {
      curveX: 255,
      dLabel: "d",
      vOut: "ΔV = 0.0 V",
      vColor: "#0284c7",
      status: "Resting: Constant distance d → constant capacitance C → ΔV = 0 V",
      waveOpacity: 0.7
    },
    compression: {
      curveX: 288, // moves closer to backplate (x=315)
      dLabel: "d ↓",
      vOut: "ΔV = +1.5 V",
      vColor: "#16a34a",
      status: "Compression: Pressure pushes diaphragm inward (d ↓) → C ↑ → Audio ΔV > 0",
      waveOpacity: 1.0
    },
    rarefaction: {
      curveX: 232, // moves away from backplate
      dLabel: "d ↑",
      vOut: "ΔV = -1.5 V",
      vColor: "#dc2626",
      status: "Rarefaction: Diaphragm flexes outward (d ↑) → C ↓ → Audio ΔV < 0",
      waveOpacity: 0.35
    }
  };

  function updateVisuals(st) {
    const s = data[st];
    
    // Update Diaphragm curve: M 255 95 Q [curveX] 145 255 195
    const dPath = `M 255 95 Q ${s.curveX} 145 255 195`;
    document.getElementById('diaphragm').setAttribute('d', dPath);

    // Update Distance Dimension line
    const lineX1 = s.curveX;
    const lineX2 = 315;
    const distLine = document.getElementById('distLine');
    distLine.setAttribute('x1', lineX1);
    distLine.setAttribute('y1', '145');
    distLine.setAttribute('x2', lineX2);
    distLine.setAttribute('y2', '145');

    // Update vertical guide line on diaphragm center
    const guide = document.getElementById('guideDiaphragm');
    guide.setAttribute('x1', lineX1);
    guide.setAttribute('x2', lineX1);
    guide.setAttribute('y1', '136');
    guide.setAttribute('y2', '154');

    // Update center label text position
    const midX = (lineX1 + lineX2) / 2;
    const distText = document.getElementById('distText');
    distText.setAttribute('x', midX);
    distText.textContent = s.dLabel;

    // Formula & Header tags
    document.getElementById('labelD').textContent = s.dLabel;
    const valOut = document.getElementById('valOut');
    valOut.textContent = s.vOut;
    valOut.style.color = s.vColor;

    // Status description
    document.getElementById('statusText').textContent = s.status;

    // Waves opacity
    document.getElementById('soundWaves').setAttribute('opacity', s.waveOpacity);

    // Button states
    document.getElementById('btnNeutral').classList.toggle('active', st === 'neutral');
    document.getElementById('btnComp').classList.toggle('active', st === 'compression');
    document.getElementById('btnRare').classList.toggle('active', st === 'rarefaction');
  }

  function setState(st) {
    currentState = st;
    updateVisuals(st);
  }

  function toggleAuto() {
    const playBtn = document.getElementById('btnPlay');
    if (autoTimer) {
      clearInterval(autoTimer);
      autoTimer = null;
      playBtn.textContent = '▶ Auto-Cycle';
      playBtn.classList.remove('active');
    } else {
      playBtn.textContent = '⏸ Pause';
      playBtn.classList.add('active');
      let idx = states.indexOf(currentState);
      autoTimer = setInterval(() => {
        idx = (idx + 1) % states.length;
        setState(states[idx]);
      }, 2200);
    }
  }

  // Initialize
  updateVisuals('neutral');
</script>

</body>
</html>

Transducer Types: Dynamic, Condenser, and Ribbon Microphones

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html, body {
      width: 100%;
      height: 100%;
      background: #f8fafc;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      user-select: none;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 8px 12px;
      overflow-x: hidden;
    }

    .main-svg {
      width: 100%;
      max-width: 680px;
      height: auto;
      flex-grow: 1;
      max-height: 480px;
      display: block;
    }

    /* Controls bar */
    .controls {
      display: flex;
      gap: 8px;
      justify-content: center;
      width: 100%;
      max-width: 520px;
      margin-top: 4px;
      margin-bottom: 2px;
      flex-wrap: wrap;
    }

    .btn {
      flex: 1 1 120px;
      padding: 8px 10px;
      font-size: 13px;
      font-weight: 600;
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      border-radius: 8px;
      color: #475569;
      cursor: pointer;
      text-align: center;
      transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    }

    .btn:hover {
      border-color: #94a3b8;
      background: #f1f5f9;
    }

    .btn.active {
      background: #2563eb;
      border-color: #2563eb;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(37,99,235,0.25);
    }

    /* Wave animations */
    @keyframes frontWave {
      0% { transform: translateY(0) scale(0.92); opacity: 0; }
      35% { opacity: 0.85; }
      100% { transform: translateY(26px) scale(1.04); opacity: 0; }
    }
    @keyframes rearWave {
      0% { transform: translateY(0) scale(0.92); opacity: 0; }
      35% { opacity: 0.85; }
      100% { transform: translateY(-26px) scale(1.04); opacity: 0; }
    }
    @keyframes ribbonOscillate {
      0%, 100% { transform: translate(0, 0); }
      25% { transform: translate(-2.5px, 0); }
      75% { transform: translate(2.5px, 0); }
    }
    @keyframes currentFlow {
      0% { stroke-dashoffset: 40; }
      100% { stroke-dashoffset: 0; }
    }

    .wave-front {
      animation: frontWave 2.6s ease-out infinite;
      transform-origin: 300px 305px;
    }
    .wave-front-2 {
      animation: frontWave 2.6s ease-out infinite;
      animation-delay: 1.3s;
      transform-origin: 300px 305px;
    }
    .wave-rear {
      animation: rearWave 2.6s ease-out infinite;
      transform-origin: 300px 75px;
    }
    .wave-rear-2 {
      animation: rearWave 2.6s ease-out infinite;
      animation-delay: 1.3s;
      transform-origin: 300px 75px;
    }

    .ribbon-vibe {
      animation: ribbonOscillate 1.8s ease-in-out infinite;
      transform-origin: 300px 190px;
    }

    .current-line {
      stroke-dasharray: 8 8;
      animation: currentFlow 2.4s linear infinite;
    }

    .trans-element {
      transition: opacity 0.35s ease;
    }

    .hidden {
      display: none !important;
    }

    @media (max-width: 480px) {
      .btn {
        font-size: 11.5px;
        padding: 6px 6px;
      }
      body {
        padding: 4px 6px;
      }
    }
  </style>
</head>
<body>

  <svg class="main-svg" viewBox="0 0 710 430" fill="none" xmlns="http://www.w3.org/2000/svg">
    <defs>
      
      <linearGradient id="northGrad" x1="0%" y1="0%" x2="100%" y2="100%">
        <stop offset="0%" stop-color="#ef4444" />
        <stop offset="100%" stop-color="#b91c1c" />
      </linearGradient>
      <linearGradient id="northTop" x1="0%" y1="100%" x2="0%" y2="0%">
        <stop offset="0%" stop-color="#f87171" />
        <stop offset="100%" stop-color="#fca5a5" />
      </linearGradient>
      <linearGradient id="northSide" x1="0%" y1="0%" x2="100%" y2="0%">
        <stop offset="0%" stop-color="#991b1b" />
        <stop offset="100%" stop-color="#7f1d1d" />
      </linearGradient>

      <linearGradient id="southGrad" x1="0%" y1="0%" x2="100%" y2="100%">
        <stop offset="0%" stop-color="#3b82f6" />
        <stop offset="100%" stop-color="#1d4ed8" />
      </linearGradient>
      <linearGradient id="southTop" x1="0%" y1="100%" x2="0%" y2="0%">
        <stop offset="0%" stop-color="#60a5fa" />
        <stop offset="100%" stop-color="#93c5fd" />
      </linearGradient>
      <linearGradient id="southSide" x1="0%" y1="0%" x2="100%" y2="0%">
        <stop offset="0%" stop-color="#1e40af" />
        <stop offset="100%" stop-color="#1e3a8a" />
      </linearGradient>

      
      <linearGradient id="foilGrad" x1="0%" y1="0%" x2="100%" y2="0%">
        <stop offset="0%" stop-color="#94a3b8" />
        <stop offset="35%" stop-color="#f8fafc" />
        <stop offset="70%" stop-color="#cbd5e1" />
        <stop offset="100%" stop-color="#64748b" />
      </linearGradient>

      
      <linearGradient id="coreGrad" x1="0%" y1="0%" x2="100%" y2="100%">
        <stop offset="0%" stop-color="#64748b" />
        <stop offset="100%" stop-color="#334155" />
      </linearGradient>

      
      <marker id="arrowMag" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
        <path d="M 0 1 L 8 5 L 0 9 z" fill="#0284c7" />
      </marker>
    </defs>

    
    <g id="figure8Group" class="trans-element" opacity="0.32">
      
      <path d="M 300 185 C 220 115 220 30 300 30 C 380 30 380 115 300 185 Z" fill="#38bdf8" />
      
      <path d="M 300 185 C 220 255 220 340 300 340 C 380 340 380 255 300 185 Z" fill="#38bdf8" />
    </g>

    
    <g id="sideNullGroup" class="trans-element">
      <rect x="18" y="174" width="94" height="24" rx="4" fill="#ffffff" stroke="#cbd5e1" stroke-width="1.2"/>
      <text x="65" y="190" font-size="11.5" font-weight="700" fill="#1e293b" text-anchor="middle">Side Null (0)</text>

      <rect x="490" y="174" width="94" height="24" rx="4" fill="#ffffff" stroke="#cbd5e1" stroke-width="1.2"/>
      <text x="537" y="190" font-size="11.5" font-weight="700" fill="#1e293b" text-anchor="middle">Side Null (0)</text>
    </g>

    
    <g id="rearWaves" class="trans-element">
      <path class="wave-rear" d="M 230 62 Q 300 88 370 62" stroke="#0284c7" stroke-width="3" stroke-linecap="round" fill="none" opacity="0.75"/>
      <path class="wave-rear-2" d="M 245 42 Q 300 68 355 42" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" fill="none" opacity="0.75"/>
      <text x="300" y="32" font-size="13" font-weight="700" fill="#0284c7" text-anchor="middle">Rear Sound (+)</text>
    </g>

    
    <g class="trans-element" id="magneticLabelGroup">
      <rect x="220" y="96" width="160" height="20" rx="4" fill="#ffffff" fill-opacity="0.9" stroke="#93c5fd" stroke-width="1" />
      <text x="300" y="110" font-size="11" font-weight="700" fill="#0284c7" text-anchor="middle" letter-spacing="0.5">MAGNETIC FIELD (B)</text>
    </g>

    
    <g class="trans-element" id="magLines" stroke="#0284c7" stroke-width="1.5" stroke-dasharray="4 4" opacity="0.65">
      <line x1="205" y1="135" x2="395" y2="135" marker-end="url(#arrowMag)" />
      <line x1="205" y1="168" x2="395" y2="168" marker-end="url(#arrowMag)" />
      <line x1="205" y1="202" x2="395" y2="202" marker-end="url(#arrowMag)" />
      <line x1="205" y1="235" x2="395" y2="235" marker-end="url(#arrowMag)" />
    </g>

    
    <g id="northPole" class="trans-element">
      
      <polygon points="120,105 185,105 205,123 140,123" fill="url(#northTop)" />
      
      <polygon points="140,123 205,123 205,255 140,255" fill="url(#northGrad)" />
      
      <polygon points="120,105 140,123 140,255 120,237" fill="url(#northSide)" />
      
      <text x="172" y="198" font-size="34" font-weight="900" fill="#ffffff" text-anchor="middle" opacity="0.95">N</text>
    </g>

    
    <g id="southPole" class="trans-element">
      
      <polygon points="395,123 460,123 480,105 415,105" fill="url(#southTop)" />
      
      <polygon points="395,123 460,123 460,255 395,255" fill="url(#southGrad)" />
      
      <polygon points="460,123 480,105 480,237 460,255" fill="url(#southSide)" />
      
      <text x="428" y="198" font-size="34" font-weight="900" fill="#ffffff" text-anchor="middle" opacity="0.95">S</text>
    </g>

    
    <rect x="286" y="112" width="28" height="14" rx="3" fill="#475569" stroke="#334155" stroke-width="1.5"/>
    <circle cx="300" cy="119" r="3" fill="#cbd5e1" />
    <rect x="286" y="254" width="28" height="14" rx="3" fill="#475569" stroke="#334155" stroke-width="1.5"/>
    <circle cx="300" cy="261" r="3" fill="#cbd5e1" />

    
    <g id="ribbonGroup" class="ribbon-vibe trans-element">
      <path d="
        M 292,126 L 308,126
        L 294,136 L 306,140
        L 294,150 L 306,154
        L 294,164 L 306,168
        L 294,178 L 306,182
        L 294,192 L 306,196
        L 294,206 L 306,210
        L 294,220 L 306,224
        L 294,234 L 306,238
        L 294,248 L 306,252
        L 308,254 L 292,254
        L 294,248 L 292,248
        L 294,234 L 292,234
        L 294,220 L 292,220
        L 294,206 L 292,206
        L 294,192 L 292,192
        L 294,178 L 292,178
        L 294,164 L 292,164
        L 294,150 L 292,150
        L 294,136 L 292,136
        Z"
        fill="url(#foilGrad)" stroke="#475569" stroke-width="0.8" stroke-linejoin="round" />
    </g>

    <text x="300" y="74" font-size="12.5" font-weight="700" fill="#1e2945" text-anchor="middle">Corrugated Ribbon</text>

    
    
    <path d="M 300 112 L 300 82 L 485 82 L 485 305 L 452 305" fill="none" stroke="#d97706" stroke-width="2.5" stroke-linecap="round"/>
    <path class="current-line" d="M 300 112 L 300 82 L 485 82 L 485 305 L 452 305" fill="none" stroke="#fbbf24" stroke-width="2.5"/>

    
    <path d="M 300 268 L 300 286 L 418 286 L 418 322 L 430 322" fill="none" stroke="#d97706" stroke-width="2.5" stroke-linecap="round"/>
    <path class="current-line" d="M 300 268 L 300 286 L 418 286 L 418 322 L 430 322" fill="none" stroke="#fbbf24" stroke-width="2.5"/>

    
    <g id="frontWaves" class="trans-element">
      <path class="wave-front" d="M 230 316 Q 300 292 370 316" stroke="#0284c7" stroke-width="3" stroke-linecap="round" fill="none" opacity="0.75"/>
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      <text x="536" y="321" font-size="12" font-weight="700" fill="#2563eb" text-anchor="start">Mic Output (V~)</text>
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  <div class="controls">
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    <button class="btn" id="btnFig8" onclick="setMode('fig8')">Figure-8 Pattern</button>
    <button class="btn" id="btnTrans" onclick="setMode('trans')">Transformer Circuit</button>
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</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
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      padding: 0;
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    body {
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      color: #1e2945;
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      align-items: center;
      padding: 2px 4px;
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    .title {
      font-size: 14px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
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    .btn-wave {
      appearance: none;
      border: 1px solid #cbd5e1;
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      color: #1e2945;
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      font-weight: 600;
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      gap: 6px;
      transition: background 0.2s, box-shadow 0.2s;
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    .btn-wave:hover {
      background: #f1f5f9;
      box-shadow: 0 1px 3px rgba(0,0,0,0.08);
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    .cards-grid {
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      gap: 10px;
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    @media (max-width: 580px) {
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      border-radius: 12px;
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      justify-content: space-between;
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    .card-title {
      font-size: 15px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .tag-badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 6px;
      text-transform: uppercase;
      letter-spacing: 0.03em;
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    /* Accents */
    .c-dynamic { --accent: #22b7ff; }
    .c-condenser { --accent: #10b981; }
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    .c-ribbon .tag-badge { background: #fef3c7; }

    /* Visual Mechanism Box */
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      width: 100%;
      height: 120px;
      background: #f8fafc;
      border: 1px solid #f1f5f9;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .mech-svg {
      width: 100%;
      height: 100%;
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    /* Property Chips */
    .props {
      display: flex;
      flex-direction: column;
      gap: 5px;
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    .prop-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      padding: 3px 6px;
      background: #f8fafc;
      border-radius: 6px;
      border: 1px solid #f1f5f9;
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      color: #64748b;
      font-weight: 500;
    }

    .prop-val {
      font-weight: 700;
      color: #1e2945;
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    /* Wave Animation */
    .animating .vibrate-x {
      animation: vibX 0.4s ease-in-out infinite alternate;
    }

    .animating .vibrate-y {
      animation: vibY 0.3s ease-in-out infinite alternate;
    }

    .animating .wave-line {
      stroke-dasharray: 4;
      animation: waveMove 0.6s linear infinite;
    }

    @keyframes vibX {
      0% { transform: translateX(-3px); }
      100% { transform: translateX(3px); }
    }

    @keyframes vibY {
      0% { transform: scaleY(0.95); }
      100% { transform: scaleY(1.05); }
    }

    @keyframes waveMove {
      0% { stroke-dashoffset: 0; }
      100% { stroke-dashoffset: 8; }
    }
  </style>
</head>
<body class="animating" id="bodyRoot">

  <div class="header-bar">
    <span class="title">Transducer Architectures</span>
    <button class="btn-wave" id="toggleAnim" type="button">
      <span id="btnIcon">⏸</span> Sound Motion
    </button>
  </div>

  <div class="cards-grid">
    
    
    <div class="mic-card c-dynamic">
      <div class="card-top">
        <span class="card-title">🛡️ Dynamic</span>
        <span class="tag-badge">Induction</span>
      </div>

      <div class="mech-box">
        <svg class="mech-svg" viewBox="0 0 160 100">
          
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          <rect x="113" y="25" width="22" height="50" rx="3" fill="#cbd5e1" stroke="#94a3b8" stroke-width="1.5"/>
          <text x="124" y="54" font-size="10" font-weight="bold" fill="#475569" text-anchor="middle">S</text>
          
          <rect x="65" y="32" width="30" height="36" rx="2" fill="#94a3b8"/>
          <text x="80" y="54" font-size="11" font-weight="bold" fill="#ffffff" text-anchor="middle">N</text>

          
          <g class="vibrate-x" style="transform-origin: 80px 50px;">
            
            <path d="M 45,20 Q 80,5 115,20" fill="none" stroke="#0284c7" stroke-width="3" stroke-linecap="round"/>
            
            <line x1="56" y1="18" x2="56" y2="60" stroke="#f59e0b" stroke-width="3" stroke-dasharray="2 2"/>
            <line x1="104" y1="18" x2="104" y2="60" stroke="#f59e0b" stroke-width="3" stroke-dasharray="2 2"/>
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          <line x1="95" y1="50" x2="113" y2="50" stroke="#38bdf8" stroke-width="1" stroke-dasharray="2"/>
        </svg>
      </div>

      <div class="props">
        <div class="prop-row">
          <span class="prop-label">Diaphragm Mass</span>
          <span class="prop-val">Heavy (Coil)</span>
        </div>
        <div class="prop-row">
          <span class="prop-label">Power Required</span>
          <span class="prop-val">0V (Passive)</span>
        </div>
        <div class="prop-row">
          <span class="prop-label">Key Strength</span>
          <span class="prop-val">High SPL / Rugged</span>
        </div>
      </div>
    </div>

    
    <div class="mic-card c-condenser">
      <div class="card-top">
        <span class="card-title">⚡ Condenser</span>
        <span class="tag-badge">Capacitor</span>
      </div>

      <div class="mech-box">
        <svg class="mech-svg" viewBox="0 0 160 100">
          
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          <circle cx="98" cy="50" r="2" fill="#ffffff"/>
          <circle cx="98" cy="65" r="2" fill="#ffffff"/>
          
          
          <g class="vibrate-x" style="transform-origin: 65px 50px;">
            <line x1="68" y1="18" x2="68" y2="82" stroke="#10b981" stroke-width="2.5" stroke-linecap="round"/>
          </g>

          
          <path d="M 68,50 L 50,50 L 50,88 L 110,88 L 110,50 L 104,50" fill="none" stroke="#94a3b8" stroke-width="1.5"/>
          
          
          <rect x="64" y="80" width="32" height="15" rx="4" fill="#10b981"/>
          <text x="80" y="91" font-size="9" font-weight="bold" fill="#ffffff" text-anchor="middle">+48V</text>

          
          <line x1="72" y1="35" x2="88" y2="35" stroke="#34d399" stroke-width="1" stroke-dasharray="1.5"/>
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          <line x1="72" y1="65" x2="88" y2="65" stroke="#34d399" stroke-width="1" stroke-dasharray="1.5"/>
        </svg>
      </div>

      <div class="props">
        <div class="prop-row">
          <span class="prop-label">Diaphragm Mass</span>
          <span class="prop-val">Ultra-Light Foil</span>
        </div>
        <div class="prop-row">
          <span class="prop-label">Power Required</span>
          <span class="prop-val">+48V Phantom</span>
        </div>
        <div class="prop-row">
          <span class="prop-label">Key Strength</span>
          <span class="prop-val">Fast Transients</span>
        </div>
      </div>
    </div>

    
    <div class="mic-card c-ribbon">
      <div class="card-top">
        <span class="card-title">〰️ Ribbon</span>
        <span class="tag-badge">Velocity</span>
      </div>

      <div class="mech-box">
        <svg class="mech-svg" viewBox="0 0 160 100">
          
          <path d="M 25,20 L 48,35 L 48,65 L 25,80 Z" fill="#cbd5e1" stroke="#94a3b8" stroke-width="1.5"/>
          <text x="34" y="54" font-size="11" font-weight="bold" fill="#475569" text-anchor="middle">N</text>
          
          <path d="M 135,20 L 112,35 L 112,65 L 135,80 Z" fill="#cbd5e1" stroke="#94a3b8" stroke-width="1.5"/>
          <text x="126" y="54" font-size="11" font-weight="bold" fill="#475569" text-anchor="middle">S</text>

          
          <g class="vibrate-x" style="transform-origin: 80px 50px;">
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                  fill="none" stroke="#f59e0b" stroke-width="3" stroke-linecap="round"/>
          </g>

          
          <path d="M 62,50 L 72,50" stroke="#f59e0b" stroke-width="1.5" marker-end="url(#arrow)" class="wave-line"/>
          <path d="M 98,50 L 88,50" stroke="#f59e0b" stroke-width="1.5" marker-end="url(#arrow)" class="wave-line"/>

          
          <line x1="48" y1="50" x2="112" y2="50" stroke="#fbbf24" stroke-width="1" stroke-dasharray="2 3"/>
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      </div>

      <div class="props">
        <div class="prop-row">
          <span class="prop-label">Diaphragm Mass</span>
          <span class="prop-val">Near-Zero Ribbon</span>
        </div>
        <div class="prop-row">
          <span class="prop-label">Power Required</span>
          <span class="prop-val">0V (Passive)</span>
        </div>
        <div class="prop-row">
          <span class="prop-label">Polar Pattern</span>
          <span class="prop-val">Natural Figure-8</span>
        </div>
      </div>
    </div>

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    const btnIcon = document.getElementById('btnIcon');

    let isPlaying = true;

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      if (isPlaying) {
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        btnIcon.textContent = '⏸';
      } else {
        body.classList.remove('animating');
        btnIcon.textContent = '▶';
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  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      min-height: 100%;
      background: transparent;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 8px;
      user-select: none;
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      max-width: 640px;
      display: flex;
      flex-direction: column;
      gap: 10px;
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    .header-labels {
      display: grid;
      grid-template-columns: 1.1fr 0.8fr 1.1fr;
      text-align: center;
      font-size: clamp(12px, 3.2vw, 14px);
      font-weight: 700;
      letter-spacing: 0.2px;
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    .label-acoustic { color: #0284c7; }
    .label-transducer { color: #1e2945; }
    .label-electric { color: #e67e22; }

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      position: relative;
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    canvas {
      display: block;
      width: 100%;
      height: auto;
      aspect-ratio: 640 / 280;
    }

    .legend {
      display: flex;
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      flex-wrap: wrap;
      gap: 16px;
      font-size: clamp(11px, 2.8vw, 13px);
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      display: flex;
      align-items: center;
      gap: 6px;
    }

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      height: 10px;
      border-radius: 50%;
      flex-shrink: 0;
    }
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    .dot-orange { background: #e67e22; }

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      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: 2px;
    }

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      border-radius: 8px;
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      font-size: 13px;
      font-weight: 600;
      color: #1e2945;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: background-color 0.15s ease, border-color 0.15s ease;
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      background: #f1f5f9;
      border-color: #94a3b8;
    }

    .btn:active {
      background: #e2e8f0;
    }
  </style>
</head>
<body>
  <div class="main-view">
    <div class="header-labels">
      <span class="label-acoustic">Acoustic Pressure</span>
      <span class="label-transducer">Transducer</span>
      <span class="label-electric">Electrical Audio</span>
    </div>

    <div class="canvas-container">
      <canvas id="stage" width="640" height="280"></canvas>
    </div>

    <div class="legend">
      <div class="legend-item">
        <span class="dot dot-blue"></span>
        <span>Compressions &amp; Rarefactions</span>
      </div>
      <div class="legend-item">
        <span class="dot dot-orange"></span>
        <span>Alternating Voltage (AC)</span>
      </div>
    </div>

    <div class="controls">
      <button class="btn" id="playToggle" aria-label="Toggle animation playback">
        <span id="playIcon">⏸</span> <span id="playText">Pause</span>
      </button>
    </div>
  </div>

  <script>
    const canvas = document.getElementById('stage');
    const ctx = canvas.getContext('2d');
    const playBtn = document.getElementById('playToggle');
    const playIcon = document.getElementById('playIcon');
    const playText = document.getElementById('playText');

    let isPlaying = true;
    let time = 0;

    // Particle grid for acoustic pressure wave
    const numRows = 13;
    const numCols = 22;
    const particles = [];
    for (let r = 0; r < numRows; r++) {
      for (let c = 0; c < numCols; c++) {
        particles.push({
          baseX: 18 + c * 9.5,
          baseY: 34 + r * 15,
          row: r,
          col: c
        });
      }
    }

    playBtn.addEventListener('click', () => {
      isPlaying = !isPlaying;
      playIcon.textContent = isPlaying ? '⏸' : '▶';
      playText.textContent = isPlaying ? 'Pause' : 'Play';
    });

    function draw() {
      ctx.clearRect(0, 0, canvas.width, canvas.height);

      const freq = 0.05;
      const speed = 0.08;
      const t = time;
      const cy = 125;

      // 1. LEFT REGION: Acoustic Sound Pressure Waves
      const acousticBoxW = 230;
      ctx.save();
      
      for (const p of particles) {
        const wave = Math.sin(p.baseX * freq - t * speed);
        const dispX = wave * 7;
        const currentX = p.baseX + dispX;
        const density = (wave + 1) / 2;
        
        ctx.fillStyle = `rgba(2, 132, 199, ${0.25 + density * 0.75})`;
        ctx.beginPath();
        ctx.arc(currentX, p.baseY, 2.4, 0, Math.PI * 2);
        ctx.fill();
      }

      // Pressure wave guide envelope
      ctx.strokeStyle = 'rgba(2, 132, 199, 0.4)';
      ctx.lineWidth = 1.5;
      ctx.setLineDash([3, 3]);
      ctx.beginPath();
      for (let x = 15; x < acousticBoxW; x += 2) {
        const y = cy - Math.sin(x * freq - t * speed) * 36;
        if (x === 15) ctx.moveTo(x, y);
        else ctx.lineTo(x, y);
      }
      ctx.stroke();
      ctx.setLineDash([]);
      ctx.restore();

      // 2. CENTER REGION: Transducer Capsule
      const capsuleX = 242;
      const capsuleY = 22;
      const capsuleW = 156;
      const capsuleH = 188; // Bottom at y = 210

      // Capsule Box
      ctx.fillStyle = 'rgba(241, 245, 249, 0.7)';
      ctx.strokeStyle = '#94a3b8';
      ctx.lineWidth = 1.5;
      ctx.beginPath();
      ctx.roundRect(capsuleX, capsuleY, capsuleW, capsuleH, 8);
      ctx.fill();
      ctx.stroke();

      // Diaphragm displacement driven by sound pressure wave hitting capsule boundary
      const diaphragmWave = Math.sin(acousticBoxW * freq - t * speed);
      const diaphragmX = 268 + diaphragmWave * 6;

      // Diaphragm plate
      ctx.strokeStyle = '#0284c7';
      ctx.lineWidth = 4;
      ctx.beginPath();
      ctx.moveTo(diaphragmX, 44);
      ctx.lineTo(diaphragmX, 186);
      ctx.stroke();

      // Diaphragm flexible suspension mounts
      ctx.strokeStyle = '#94a3b8';
      ctx.lineWidth = 2;
      ctx.beginPath();
      ctx.moveTo(268, 34);
      ctx.lineTo(diaphragmX, 44);
      ctx.moveTo(268, 196);
      ctx.lineTo(diaphragmX, 186);
      ctx.stroke();

      // Voice Coil linking diaphragm to magnet
      ctx.strokeStyle = '#e67e22';
      ctx.lineWidth = 2;
      const coilW = 36;
      const coilH = 26;
      ctx.strokeRect(diaphragmX, cy - coilH / 2, coilW, coilH);

      // Magnet Core
      ctx.fillStyle = '#334155';
      ctx.beginPath();
      ctx.roundRect(328, cy - 28, 48, 56, 4);
      ctx.fill();

      // Magnet Pole indicators
      ctx.fillStyle = '#f8fafc';
      ctx.font = 'bold 11px system-ui, sans-serif';
      ctx.textAlign = 'center';
      ctx.fillText('N', 340, cy + 4);
      ctx.fillText('S', 364, cy + 4);

      // Energy conversion symbol
      ctx.fillStyle = '#e67e22';
      ctx.font = '15px system-ui, sans-serif';
      ctx.fillText('⚡', 306, cy + 5);

      // Transducer Component Labels (Placed cleanly below bottom border with ample clearance)
      ctx.fillStyle = '#1e2945';
      ctx.font = 'bold 13px system-ui, -apple-system, sans-serif';
      ctx.textAlign = 'center';
      ctx.fillText('Diaphragm', 268, 238);
      ctx.fillText('Magnet', 352, 238);

      // 3. RIGHT REGION: Electrical Audio Waveform
      const graphLeft = 428;
      const graphRight = 622;

      // 0V Timeline center axis
      ctx.strokeStyle = '#cbd5e1';
      ctx.lineWidth = 1.5;
      ctx.beginPath();
      ctx.moveTo(graphLeft, cy);
      ctx.lineTo(graphRight, cy);
      ctx.stroke();

      // Time axis arrow
      ctx.strokeStyle = '#94a3b8';
      ctx.lineWidth = 1.5;
      ctx.beginPath();
      ctx.moveTo(graphRight - 6, cy - 5);
      ctx.lineTo(graphRight, cy);
      ctx.lineTo(graphRight - 6, cy + 5);
      ctx.stroke();

      // Voltage Reference Markers (Enhanced font size for mobile readability)
      ctx.fillStyle = '#64748b';
      ctx.font = 'bold 13px system-ui, -apple-system, sans-serif';
      ctx.textAlign = 'left';
      ctx.fillText('+V', graphLeft + 4, cy - 54);
      ctx.fillText('-V', graphLeft + 4, cy + 62);

      ctx.textAlign = 'right';
      ctx.fillText('0V', graphLeft - 6, cy + 4);

      // Alternating current copper waveform (Phase matched to diaphragm motion)
      ctx.strokeStyle = '#e67e22';
      ctx.lineWidth = 2.5;
      ctx.beginPath();

      const waveFreq = 0.04;
      for (let x = graphLeft; x <= graphRight; x++) {
        const dist = x - graphLeft;
        const v = Math.sin(acousticBoxW * freq - (t * speed) + dist * waveFreq);
        const y = cy - v * 48;

        if (x === graphLeft) {
          ctx.moveTo(x, y);
        } else {
          ctx.lineTo(x, y);
        }
      }
      ctx.stroke();

      // Connecting lead from coil/magnet to waveform origin
      const startV = Math.sin(acousticBoxW * freq - (t * speed));
      const leadStartY = cy - startV * 48;

      ctx.strokeStyle = '#e67e22';
      ctx.lineWidth = 1.5;
      ctx.setLineDash([3, 3]);
      ctx.beginPath();
      ctx.moveTo(376, cy);
      ctx.lineTo(graphLeft, leadStartY);
      ctx.stroke();
      ctx.setLineDash([]);

      // Active probe point at origin
      ctx.fillStyle = '#e67e22';
      ctx.beginPath();
      ctx.arc(graphLeft, leadStartY, 4.5, 0, Math.PI * 2);
      ctx.fill();

      // Animation step
      if (isPlaying) {
        time += 0.5;
      }
      requestAnimationFrame(draw);
    }

    requestAnimationFrame(draw);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Dynamic Microphone Capsule</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html, body {
      width: 100%;
      background: #f8fafc;
    }
    body {
      color: #1e2945;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 8px 8px 10px 8px;
      user-select: none;
      overflow-x: hidden;
    }

    .header-flow {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      gap: 4px 6px;
      width: 100%;
      max-width: 480px;
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.2px;
      margin-bottom: 4px;
    }
    .flow-item {
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }
    .flow-step {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 3px 7px;
      border-radius: 5px;
      color: #475569;
      transition: background-color 0.2s, border-color 0.2s, color 0.2s;
      white-space: nowrap;
      text-align: center;
    }
    .flow-step.active {
      background: #eff6ff;
      border-color: #3b82f6;
      color: #1d4ed8;
      box-shadow: 0 1px 2px rgba(59, 130, 246, 0.12);
    }
    .flow-arrow {
      color: #94a3b8;
      font-size: 10px;
      font-weight: 800;
      user-select: none;
    }

    .svg-container {
      width: 100%;
      max-width: 480px;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
    }

    /* Controls */
    .controls {
      display: flex;
      gap: 8px;
      margin-top: 4px;
    }
    .btn {
      background: #ffffff;
      border: 1px solid #94a3b8;
      color: #1e2945;
      padding: 5px 14px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 1px 2px rgba(0,0,0,0.06);
      transition: background-color 0.15s, border-color 0.15s, color 0.15s;
    }
    .btn:hover {
      background: #f1f5f9;
    }
    .btn.active {
      background: #0284c7;
      color: #ffffff;
      border-color: #0284c7;
    }

    /* Animations */
    .is-vibrating .sound-wave-1 {
      animation: wavePulse 1.4s infinite ease-out;
    }
    .is-vibrating .sound-wave-2 {
      animation: wavePulse 1.4s infinite ease-out 0.35s;
    }
    .is-vibrating .sound-wave-3 {
      animation: wavePulse 1.4s infinite ease-out 0.7s;
    }
    .is-vibrating .moving-assembly {
      animation: coilOscillate 1.4s infinite ease-in-out;
    }
    .is-vibrating .flux-arrow {
      animation: fluxFlash 1.4s infinite ease-in-out;
    }
    .is-vibrating .signal-line {
      stroke-dashoffset: 0;
      animation: signalFlow 1.4s linear infinite;
    }

    @keyframes wavePulse {
      0% { opacity: 0; transform: translateY(-4px); }
      30% { opacity: 1; }
      80% { opacity: 0.8; }
      100% { opacity: 0; transform: translateY(8px); }
    }
    @keyframes coilOscillate {
      0%, 100% { transform: translateY(0px); }
      25% { transform: translateY(4px); }
      75% { transform: translateY(-4px); }
    }
    @keyframes fluxFlash {
      0%, 100% { stroke: #0891b2; opacity: 0.75; }
      25%, 75% { stroke: #0284c7; opacity: 1; stroke-width: 2.2px; }
    }
    @keyframes signalFlow {
      to { stroke-dashoffset: -20; }
    }

    /* Small screen tuning */
    @media (max-width: 380px) {
      body {
        padding: 6px 6px 8px 6px;
      }
      .header-flow {
        font-size: 10px;
        gap: 3px 5px;
      }
      .flow-item {
        gap: 4px;
      }
      .flow-step {
        padding: 2.5px 5.5px;
      }
      .flow-arrow {
        font-size: 9px;
      }
      .btn {
        padding: 4px 11px;
        font-size: 11px;
      }
    }
  </style>
</head>
<body class="is-vibrating">

  
  <div class="header-flow">
    <div class="flow-item">
      <span class="flow-step active" id="st1">Diaphragm Vibrates</span>
      <span class="flow-arrow" aria-hidden="true">→</span>
    </div>
    <div class="flow-item">
      <span class="flow-step active" id="st2">Coil Cuts Flux</span>
      <span class="flow-arrow" aria-hidden="true">→</span>
    </div>
    <div class="flow-item">
      <span class="flow-step active" id="st3">Voltage Induced</span>
    </div>
  </div>

  
  <div class="svg-container">
    <svg viewBox="0 0 460 315" preserveAspectRatio="xMidYMid meet">
      <defs>
        
        <marker id="arrow-left" markerWidth="5" markerHeight="5" refX="4" refY="2.5" orient="auto">
          <polygon points="5 0, 0 2.5, 5 5" fill="#0891b2" />
        </marker>
        <marker id="arrow-right" markerWidth="5" markerHeight="5" refX="1" refY="2.5" orient="auto">
          <polygon points="0 0, 5 2.5, 0 5" fill="#0891b2" />
        </marker>
        
        
        <linearGradient id="copperGrad" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#b45309" />
          <stop offset="50%" stop-color="#f59e0b" />
          <stop offset="100%" stop-color="#b45309" />
        </linearGradient>

        
        <linearGradient id="northGrad" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#ef4444" />
          <stop offset="50%" stop-color="#f87171" />
          <stop offset="100%" stop-color="#dc2626" />
        </linearGradient>
        <linearGradient id="southGrad" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#2563eb" />
          <stop offset="50%" stop-color="#60a5fa" />
          <stop offset="100%" stop-color="#1d4ed8" />
        </linearGradient>
      </defs>

      
      <text x="230" y="14" text-anchor="middle" font-size="12" font-weight="700" fill="#0284c7">Sound Waves (Pressure)</text>
      <g id="sound-waves" stroke="#0284c7" stroke-width="2.5" fill="none" stroke-linecap="round">
        <path class="sound-wave-1" d="M 175 25 Q 230 17 285 25" opacity="0.8"/>
        <path class="sound-wave-2" d="M 160 36 Q 230 27 300 36" opacity="0.8"/>
        <path class="sound-wave-3" d="M 145 47 Q 230 37 315 47" opacity="0.8"/>
      </g>

      
      <g id="magnet-assembly">
        
        <path d="M 95 145 L 95 245 Q 95 253 103 253 L 357 253 Q 365 253 365 245 L 365 145 L 335 145 L 335 225 L 125 225 L 125 145 Z" 
              fill="#e2e8f0" stroke="#94a3b8" stroke-width="2" />
        
        
        <rect x="98" y="145" width="34" height="65" fill="url(#southGrad)" stroke="#1e3a8a" stroke-width="1.5" rx="2" />
        <text x="115" y="182" fill="#ffffff" font-size="15" font-weight="800" text-anchor="middle">S</text>

        
        <rect x="328" y="145" width="34" height="65" fill="url(#southGrad)" stroke="#1e3a8a" stroke-width="1.5" rx="2" />
        <text x="345" y="182" fill="#ffffff" font-size="15" font-weight="800" text-anchor="middle">S</text>

        
        <rect x="195" y="145" width="70" height="80" fill="url(#northGrad)" stroke="#991b1b" stroke-width="1.5" rx="2" />
        <text x="230" y="189" fill="#ffffff" font-size="17" font-weight="800" text-anchor="middle">N</text>
        <text x="230" y="205" fill="#fee2e2" font-size="10" font-weight="700" text-anchor="middle">MAGNET</text>

        
        <rect x="75" y="81" width="22" height="6" fill="#94a3b8" rx="2" />
        <rect x="363" y="81" width="22" height="6" fill="#94a3b8" rx="2" />
      </g>

      
      <g id="flux-lines" stroke="#0891b2" stroke-width="1.8" stroke-dasharray="3,2">
        
        <line class="flux-arrow" x1="192" y1="157" x2="135" y2="157" marker-end="url(#arrow-left)" />
        <line class="flux-arrow" x1="192" y1="177" x2="135" y2="177" marker-end="url(#arrow-left)" />
        <line class="flux-arrow" x1="192" y1="197" x2="135" y2="197" marker-end="url(#arrow-left)" />

        
        <line class="flux-arrow" x1="268" y1="157" x2="325" y2="157" marker-end="url(#arrow-right)" />
        <line class="flux-arrow" x1="268" y1="177" x2="325" y2="177" marker-end="url(#arrow-right)" />
        <line class="flux-arrow" x1="268" y1="197" x2="325" y2="197" marker-end="url(#arrow-right)" />
      </g>
      
      
      <rect x="100" y="123" width="102" height="16" rx="3" fill="#f0fdf4" stroke="#86efac" stroke-width="0.8" />
      <text x="151" y="135" fill="#047857" font-size="9.5" font-weight="700" text-anchor="middle">Magnetic Field (B)</text>

      
      <g class="moving-assembly">
        
        <path d="M 85 84 
                 Q 100 84 110 73 
                 Q 120 91 135 84 
                 Q 180 53 230 53 
                 Q 280 53 325 84 
                 Q 340 91 350 73 
                 Q 360 84 375 84" 
              fill="rgba(56, 189, 248, 0.22)" 
              stroke="#0284c7" 
              stroke-width="2.5" 
              stroke-linecap="round" />
        
        
        <rect x="175" y="63" width="110" height="17" rx="3" fill="rgba(255, 255, 255, 0.9)" />
        <text x="230" y="75" fill="#0369a1" font-size="11.5" font-weight="700" text-anchor="middle">Mylar Diaphragm</text>

        
        <line x1="164" y1="79" x2="164" y2="147" stroke="#64748b" stroke-width="1.5" stroke-dasharray="2,2"/>
        <line x1="296" y1="79" x2="296" y2="147" stroke="#64748b" stroke-width="1.5" stroke-dasharray="2,2"/>

        
        <g id="coil-left">
          <rect x="156" y="147" width="16" height="52" fill="url(#copperGrad)" stroke="#78350f" stroke-width="1.2" rx="3" />
          <line x1="156" y1="155" x2="172" y2="155" stroke="#78350f" stroke-width="1" />
          <line x1="156" y1="163" x2="172" y2="163" stroke="#78350f" stroke-width="1" />
          <line x1="156" y1="171" x2="172" y2="171" stroke="#78350f" stroke-width="1" />
          <line x1="156" y1="179" x2="172" y2="179" stroke="#78350f" stroke-width="1" />
          <line x1="156" y1="187" x2="172" y2="187" stroke="#78350f" stroke-width="1" />
        </g>

        
        <g id="coil-right">
          <rect x="288" y="147" width="16" height="52" fill="url(#copperGrad)" stroke="#78350f" stroke-width="1.2" rx="3" />
          <line x1="288" y1="155" x2="304" y2="155" stroke="#78350f" stroke-width="1" />
          <line x1="288" y1="163" x2="304" y2="163" stroke="#78350f" stroke-width="1" />
          <line x1="288" y1="171" x2="304" y2="171" stroke="#78350f" stroke-width="1" />
          <line x1="288" y1="179" x2="304" y2="179" stroke="#78350f" stroke-width="1" />
          <line x1="288" y1="187" x2="304" y2="187" stroke="#78350f" stroke-width="1" />
        </g>
      </g>

      
      <g font-size="10" font-weight="700">
        <rect x="295" y="123" width="105" height="16" rx="3" fill="#fef3c7" stroke="#fcd34d" stroke-width="0.8" />
        <text x="347" y="135" fill="#92400e" text-anchor="middle">Copper Voice Coil</text>
        <line x1="315" y1="139" x2="302" y2="151" stroke="#92400e" stroke-width="1" />
      </g>

      
      <path class="signal-line" d="M 164 199 Q 150 260 70 260" fill="none" stroke="#d97706" stroke-width="2.2" stroke-dasharray="6,4" />
      <path class="signal-line" d="M 296 199 Q 310 260 390 260" fill="none" stroke="#d97706" stroke-width="2.2" stroke-dasharray="6,4" />

      
      <g transform="translate(48, 248)">
        <circle cx="12" cy="12" r="10" fill="#1e2945" />
        <text x="12" y="16" fill="#ffffff" font-size="14" font-weight="bold" text-anchor="middle">−</text>
      </g>
      <g transform="translate(388, 248)">
        <circle cx="12" cy="12" r="10" fill="#1e2945" />
        <text x="12" y="16.5" fill="#ffffff" font-size="14" font-weight="bold" text-anchor="middle">+</text>
      </g>
      <text x="230" y="280" fill="#1e2945" font-size="12" font-weight="700" text-anchor="middle">Induced Audio Signal (AC Voltage)</text>
      <text x="230" y="297" fill="#64748b" font-size="10" font-weight="600" text-anchor="middle">Faraday's Law: Motion in Magnetic Field creates Current</text>
    </svg>
  </div>

  
  <div class="controls">
    <button class="btn active" id="toggleBtn" onclick="toggleMotion()">
      <span id="btnIcon">⏸</span> <span id="btnText">Pause Motion</span>
    </button>
  </div>

  <script>
    let isMoving = true;
    const body = document.body;
    const btn = document.getElementById('toggleBtn');
    const btnIcon = document.getElementById('btnIcon');
    const btnText = document.getElementById('btnText');

    function toggleMotion() {
      isMoving = !isMoving;
      if (isMoving) {
        body.classList.add('is-vibrating');
        btn.classList.add('active');
        btnIcon.textContent = '⏸';
        btnText.textContent = 'Pause Motion';
      } else {
        body.classList.remove('is-vibrating');
        btn.classList.remove('active');
        btnIcon.textContent = '▶';
        btnText.textContent = 'Vibrate Diaphragm';
      }
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Dynamic Microphone Capsule Cutaway</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      width: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 10px;
    }
    .nav-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: center;
      width: 100%;
      max-width: 580px;
      margin-bottom: 8px;
    }
    .btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 5px 10px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      transition: background 0.2s, color 0.2s, border-color 0.2s;
    }
    .btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
    }
    .svg-container {
      width: 100%;
      max-width: 580px;
      aspect-ratio: 4 / 3;
      position: relative;
    }
    svg {
      width: 100%;
      height: 100%;
      display: block;
    }
    .part {
      transition: opacity 0.3s ease, stroke-width 0.3s ease;
    }
    .dimmed {
      opacity: 0.25;
    }
    .highlighted {
      opacity: 1;
      filter: drop-shadow(0 0 3px rgba(2, 132, 199, 0.4));
    }
    .wave-line {
      stroke-dasharray: 6, 6;
      animation: waveFlow 2s linear infinite;
    }
    @keyframes waveFlow {
      to { stroke-dashoffset: -24; }
    }
    text {
      user-select: none;
      font-family: system-ui, -apple-system, sans-serif;
    }
  </style>
</head>
<body>

  <div class="nav-bar" id="navBar">
    <button class="btn active" onclick="setMode(0)">Overview</button>
    <button class="btn" onclick="setMode(1)">1. Mylar Dome</button>
    <button class="btn" onclick="setMode(2)">2. Moving Coil</button>
    <button class="btn" onclick="setMode(3)">3. Rear Cavity</button>
    <button class="btn" onclick="setMode(4)">4. Damping Screen</button>
  </div>

  <div class="svg-container">
    <svg viewBox="0 0 600 450" fill="none" xmlns="http://www.w3.org/2000/svg">
      
      <rect width="600" height="450" fill="#fafbfc"/>
      <line x1="20" y1="320" x2="580" y2="320" stroke="#e2e8f0" stroke-width="1"/>
      <line x1="300" y1="20" x2="300" y2="300" stroke="#e2e8f0" stroke-dasharray="4,4" stroke-width="1"/>

      
      
      
      <g id="housing" class="part" stroke="#64748b" stroke-width="2" fill="#f1f5f9">
        <path d="M 170 120 L 170 270 L 430 270 L 430 120" />
        <path d="M 150 120 L 170 120" />
        <path d="M 430 120 L 450 120" />
      </g>

      
      <g id="part3" class="part">
        
        <rect x="200" y="160" width="200" height="90" fill="#e0f2fe" opacity="0.6"/>
        <path d="M 180 180 Q 200 240 240 250 L 360 250 Q 400 240 420 180" fill="#bae6fd" opacity="0.4"/>
        
        
        <path class="wave-line" d="M 180 200 C 220 220, 240 230, 300 230 C 360 230, 380 220, 420 200" stroke="#0284c7" stroke-width="2.5" fill="none"/>
        <path class="wave-line" d="M 300 230 L 300 135" stroke="#0284c7" stroke-width="2.5" fill="none"/>
      </g>

      
      <g id="magnet" class="part">
        
        <rect x="200" y="150" width="35" height="95" fill="#cbd5e1" stroke="#475569" stroke-width="1.5"/>
        <rect x="365" y="150" width="35" height="95" fill="#cbd5e1" stroke="#475569" stroke-width="1.5"/>
        
        <rect x="260" y="145" width="80" height="100" fill="#94a3b8" stroke="#334155" stroke-width="1.5"/>
        
        <line x1="236" y1="155" x2="259" y2="155" stroke="#ef4444" stroke-width="2" stroke-dasharray="2,2"/>
        <line x1="236" y1="170" x2="259" y2="170" stroke="#ef4444" stroke-width="2" stroke-dasharray="2,2"/>
        <line x1="341" y1="155" x2="364" y2="155" stroke="#ef4444" stroke-width="2" stroke-dasharray="2,2"/>
        <line x1="341" y1="170" x2="364" y2="170" stroke="#ef4444" stroke-width="2" stroke-dasharray="2,2"/>
      </g>

      
      <g id="part4" class="part">
        <rect x="165" y="195" width="10" height="50" rx="2" fill="#10b981" stroke="#047857" stroke-width="1.5"/>
        <rect x="425" y="195" width="10" height="50" rx="2" fill="#10b981" stroke="#047857" stroke-width="1.5"/>
        
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        <line x1="165" y1="225" x2="175" y2="225" stroke="#ffffff" stroke-width="1.5"/>
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      <g id="part2" class="part">
        
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        <line x1="346" y1="167" x2="358" y2="167" stroke="#fef3c7" stroke-width="1.5"/>
      </g>

      
      <g id="part1" class="part">
        
        <path d="M 160 120 Q 185 110 210 120 Q 230 130 248 135" stroke="#0284c7" stroke-width="3" fill="none"/>
        <path d="M 440 120 Q 415 110 390 120 Q 370 130 352 135" stroke="#0284c7" stroke-width="3" fill="none"/>
        
        <path d="M 248 135 C 265 80, 335 80, 352 135" stroke="#0284c7" stroke-width="4.5" fill="#38bdf8" fill-opacity="0.25"/>
        
        <path class="wave-line" d="M 300 45 L 300 85" stroke="#0284c7" stroke-width="2.5"/>
        <path class="wave-line" d="M 260 50 L 275 88" stroke="#0284c7" stroke-width="2.5"/>
        <path class="wave-line" d="M 340 50 L 325 88" stroke="#0284c7" stroke-width="2.5"/>
      </g>

      
      <g id="labels" font-size="13" font-weight="600">
        
        <g id="lbl1" class="part">
          <line x1="300" y1="88" x2="300" y2="35" stroke="#0284c7" stroke-width="1.5"/>
          <circle cx="300" cy="88" r="3" fill="#0284c7"/>
          <rect x="235" y="16" width="130" height="24" rx="4" fill="#ffffff" stroke="#0284c7" stroke-width="1.5"/>
          <text x="300" y="32" text-anchor="middle" fill="#0369a1">1. Mylar Dome</text>
        </g>

        
        <g id="lbl2" class="part">
          <line x1="358" y1="155" x2="495" y2="155" stroke="#d97706" stroke-width="1.5"/>
          <circle cx="358" cy="155" r="3" fill="#d97706"/>
          <rect x="440" y="143" width="125" height="24" rx="4" fill="#ffffff" stroke="#d97706" stroke-width="1.5"/>
          <text x="502" y="159" text-anchor="middle" fill="#b45309">2. Moving Coil</text>
        </g>

        
        <g id="lbl3" class="part">
          <line x1="300" y1="230" x2="300" y2="288" stroke="#0284c7" stroke-width="1.5"/>
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          <rect x="235" y="276" width="130" height="24" rx="4" fill="#ffffff" stroke="#0284c7" stroke-width="1.5"/>
          <text x="300" y="292" text-anchor="middle" fill="#0369a1">3. Rear Cavity</text>
        </g>

        
        <g id="lbl4" class="part">
          <line x1="165" y1="225" x2="90" y2="225" stroke="#059669" stroke-width="1.5"/>
          <circle cx="165" cy="225" r="3" fill="#059669"/>
          <rect x="25" y="213" width="135" height="24" rx="4" fill="#ffffff" stroke="#059669" stroke-width="1.5"/>
          <text x="92" y="229" text-anchor="middle" fill="#047857">4. Damping Screen</text>
        </g>
      </g>

      
      <g id="graph" transform="translate(60, 335)">
        
        <line x1="0" y1="80" x2="480" y2="80" stroke="#94a3b8" stroke-width="1.5"/>
        <line x1="0" y1="10" x2="0" y2="80" stroke="#94a3b8" stroke-width="1.5"/>
        
        
        <line x1="0" y1="55" x2="480" y2="55" stroke="#cbd5e1" stroke-dasharray="3,3" stroke-width="1"/>
        <text x="-8" y="59" text-anchor="end" font-size="11" fill="#64748b">0 dB</text>
        <text x="-8" y="24" text-anchor="end" font-size="11" fill="#0284c7" font-weight="bold">+5 dB</text>

        
        <text x="40" y="95" text-anchor="middle" font-size="11" fill="#64748b">100 Hz</text>
        <text x="180" y="95" text-anchor="middle" font-size="11" fill="#64748b">1 kHz</text>
        <text x="340" y="95" text-anchor="middle" font-size="11" fill="#0284c7" font-weight="bold">5 kHz</text>
        <text x="450" y="95" text-anchor="middle" font-size="11" fill="#64748b">15 kHz</text>

        
        <path d="M 10 65 Q 40 55 120 55 T 260 55 Q 310 55 340 20 Q 370 20 400 55 Q 430 70 470 78" 
              stroke="#0284c7" stroke-width="3" fill="none"/>
        
        
        <circle cx="340" cy="20" r="4" fill="#0284c7"/>
        <rect x="270" y="2" width="145" height="18" rx="3" fill="#e0f2fe"/>
        <text x="342" y="15" text-anchor="middle" font-size="11" font-weight="bold" fill="#0369a1">5 kHz Presence Boost</text>
      </g>
    </svg>
  </div>

  <script>
    const modes = [
      { id: 0, parts: ['part1', 'part2', 'part3', 'part4', 'magnet', 'housing', 'lbl1', 'lbl2', 'lbl3', 'lbl4'] },
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      { id: 2, parts: ['part2', 'magnet', 'lbl2'] },
      { id: 3, parts: ['part3', 'lbl3'] },
      { id: 4, parts: ['part4', 'lbl4'] }
    ];

    const allPartIds = ['part1', 'part2', 'part3', 'part4', 'magnet', 'housing', 'lbl1', 'lbl2', 'lbl3', 'lbl4'];

    function setMode(index) {
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      buttons.forEach((b, i) => b.classList.toggle('active', i === index));

      const activeParts = modes[index].parts;

      allPartIds.forEach(id => {
        const el = document.getElementById(id);
        if (!el) return;
        if (index === 0) {
          el.classList.remove('dimmed', 'highlighted');
        } else {
          if (activeParts.includes(id)) {
            el.classList.add('highlighted');
            el.classList.remove('dimmed');
          } else {
            el.classList.add('dimmed');
            el.classList.remove('highlighted');
          }
        }
      });
    }
  </script>
</body>
</html>

Presence Peaks and High-Frequency Resonance Tailoring

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #0f172a;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 10px 12px;
      user-select: none;
      -webkit-user-select: none;
      width: 100%;
    }

    .main-wrapper {
      width: 100%;
      max-width: 580px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    /* Step Selector Tabs */
    .steps-nav {
      display: flex;
      gap: 6px;
      width: 100%;
    }
    .step-btn {
      flex: 1;
      padding: 7px 4px;
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      border-radius: 8px;
      font-size: 12px;
      font-weight: 700;
      color: #334155;
      cursor: pointer;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }
    .step-btn .step-num {
      font-size: 10px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #475569;
      font-weight: 700;
    }
    .step-btn.active {
      background: #eff6ff;
      border-color: #2563eb;
      color: #1d4ed8;
    }
    .step-btn.active .step-num {
      color: #2563eb;
      font-weight: 800;
    }

    /* Diagram Area */
    .graph-container {
      width: 100%;
      background: #ffffff;
      border-radius: 8px;
      padding: 4px 6px;
      position: relative;
    }
    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }

    /* SVG Layer States */
    .spotlight {
      opacity: 0;
      transition: opacity 0.25s ease;
      pointer-events: none;
    }
    .spotlight.active {
      opacity: 1;
    }

    /* Bottom Controls / Status Bar */
    .controls {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      font-size: 12px;
      color: #334155;
      padding: 0 2px;
    }
    .play-btn {
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      border-radius: 6px;
      padding: 4px 10px;
      font-size: 11px;
      font-weight: 700;
      color: #1e293b;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: background-color 0.15s ease;
    }
    .play-btn:active {
      background: #f1f5f9;
    }
    .dots {
      display: flex;
      gap: 6px;
      align-items: center;
    }
    .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #94a3b8;
      cursor: pointer;
      transition: background-color 0.2s ease, transform 0.2s ease;
    }
    .dot.active {
      background: #2563eb;
      width: 10px;
      height: 10px;
    }
  </style>
</head>
<body>

  <div class="main-wrapper">
    
    <div class="steps-nav">
      <button class="step-btn active" onclick="setStep(0)">
        <span class="step-num">Step 1</span>
        <span>4–6 kHz Peak</span>
      </button>
      <button class="step-btn" onclick="setStep(1)">
        <span class="step-num">Step 2</span>
        <span>+4 dB Boost</span>
      </button>
      <button class="step-btn" onclick="setStep(2)">
        <span class="step-num">Step 3</span>
        <span>&gt;15 kHz Roll-off</span>
      </button>
    </div>

    
    <div class="graph-container">
      <svg viewBox="0 0 560 250">
        <defs>
          
          <linearGradient id="peakGlow" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#3b82f6" stop-opacity="0.25"/>
            <stop offset="100%" stop-color="#3b82f6" stop-opacity="0.02"/>
          </linearGradient>
          <linearGradient id="dropGlow" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#ef4444" stop-opacity="0.25"/>
            <stop offset="100%" stop-color="#ef4444" stop-opacity="0.02"/>
          </linearGradient>
        </defs>

        
        <g stroke="#e2e8f0" stroke-width="1">
          <line x1="45" y1="35" x2="540" y2="35"/>
          <line x1="45" y1="75" x2="540" y2="75"/>
          <line x1="45" y1="155" x2="540" y2="155"/>
          <line x1="45" y1="195" x2="540" y2="195"/>
        </g>

        
        <line x1="45" y1="115" x2="540" y2="115" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="4 3"/>

        
        <g stroke="#e2e8f0" stroke-width="1">
          <line x1="102" y1="20" x2="102" y2="215"/>
          <line x1="292" y1="20" x2="292" y2="215"/>
          <line x1="483" y1="20" x2="483" y2="215"/>
        </g>

        
        <g font-size="10" fill="#475569" font-weight="600" font-family="sans-serif">
          <text x="38" y="39" text-anchor="end">+10</text>
          <text x="38" y="79" text-anchor="end">+5</text>
          <text x="38" y="119" text-anchor="end" font-weight="800" fill="#1e293b">0 dB</text>
          <text x="38" y="159" text-anchor="end">-5</text>
          <text x="38" y="199" text-anchor="end">-10</text>

          <text x="50" y="232" text-anchor="middle">50</text>
          <text x="102" y="232" text-anchor="middle">100</text>
          <text x="160" y="232" text-anchor="middle">200</text>
          <text x="236" y="232" text-anchor="middle">500</text>
          <text x="292" y="232" text-anchor="middle" font-weight="800" fill="#1e293b">1k</text>
          <text x="350" y="232" text-anchor="middle">2k</text>
          <text x="408" y="232" text-anchor="middle">4k</text>
          <text x="483" y="232" text-anchor="middle">10k</text>
          <text x="517" y="232" text-anchor="middle">15k</text>
          <text x="540" y="232" text-anchor="middle">20k</text>
          <text x="542" y="245" text-anchor="end" font-size="9" font-weight="700" fill="#475569">Hz</text>
        </g>

        
        <path d="M 45,205 C 80,180 102,145 160,130 C 210,118 250,115 292,115 C 335,115 370,103 408,83 C 430,73 455,77 483,110 C 505,140 517,170 540,220"
              fill="none" stroke="#0f172a" stroke-width="2.5" stroke-linecap="round"/>

        
        <g id="spot1" class="spotlight active">
          <rect x="408" y="25" width="40" height="190" fill="url(#peakGlow)" rx="4"/>
          <line x1="408" y1="25" x2="408" y2="215" stroke="#2563eb" stroke-width="1.2" stroke-dasharray="3 2"/>
          <line x1="448" y1="25" x2="448" y2="215" stroke="#2563eb" stroke-width="1.2" stroke-dasharray="3 2"/>
          <circle cx="426" cy="75" r="4.5" fill="#2563eb" stroke="#ffffff" stroke-width="2"/>
          
          
          <path d="M 408,38 L 448,38 M 408,34 L 408,42 M 448,34 L 448,42" stroke="#1d4ed8" stroke-width="1.5"/>
          <rect x="388" y="14" width="80" height="18" rx="3" fill="#eff6ff" stroke="#bfdbfe" stroke-width="1"/>
          <text x="428" y="27" text-anchor="middle" font-size="9.5" font-weight="700" fill="#1e40af">4–6 kHz (Vocal Bite)</text>
        </g>

        
        <g id="spot2" class="spotlight">
          
          <circle cx="292" cy="115" r="4" fill="#334155" stroke="#ffffff" stroke-width="1.5"/>
          <rect x="250" y="93" width="84" height="16" rx="3" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1"/>
          <text x="292" y="105" text-anchor="middle" font-size="9" font-weight="700" fill="#334155">1 kHz Baseline</text>
          
          
          <circle cx="426" cy="83" r="4.5" fill="#2563eb" stroke="#ffffff" stroke-width="2"/>

          
          <line x1="292" y1="115" x2="435" y2="115" stroke="#64748b" stroke-width="1" stroke-dasharray="3 3"/>
          
          
          <line x1="430" y1="115" x2="430" y2="83" stroke="#2563eb" stroke-width="2"/>
          <polygon points="427,87 430,80 433,87" fill="#2563eb"/>
          <polygon points="427,111 430,118 433,111" fill="#2563eb"/>
          
          
          <rect x="440" y="87" width="62" height="22" rx="4" fill="#eff6ff" stroke="#93c5fd" stroke-width="1"/>
          <text x="471" y="102" text-anchor="middle" font-size="11" font-weight="800" fill="#1d4ed8">+4 dB Boost</text>
        </g>

        
        <g id="spot3" class="spotlight">
          <rect x="517" y="25" width="28" height="190" fill="url(#dropGlow)" rx="4"/>
          <line x1="517" y1="25" x2="517" y2="215" stroke="#dc2626" stroke-width="1.5" stroke-dasharray="3 2"/>

          
          <path d="M 517,170 C 526,190 534,207 538,217" fill="none" stroke="#dc2626" stroke-width="3"/>
          <polygon points="534,219 542,223 541,214" fill="#dc2626"/>

          
          <rect x="410" y="152" width="102" height="22" rx="4" fill="#fef2f2" stroke="#fca5a5" stroke-width="1"/>
          <text x="461" y="167" text-anchor="middle" font-size="9.5" font-weight="700" fill="#991b1b">&gt;15 kHz Coil Roll-off</text>
        </g>
      </svg>
    </div>

    
    <div class="controls">
      <button class="play-btn" id="playBtn" onclick="togglePlay()">
        <span id="playIcon">⏸</span> <span id="playLabel">Auto</span>
      </button>
      <div class="dots">
        <div class="dot active" onclick="setStep(0)"></div>
        <div class="dot" onclick="setStep(1)"></div>
        <div class="dot" onclick="setStep(2)"></div>
      </div>
    </div>
  </div>

  <script>
    let currentStep = 0;
    let playing = true;
    let timer = null;

    const stepBtns = document.querySelectorAll('.step-btn');
    const spotlights = [
      document.getElementById('spot1'),
      document.getElementById('spot2'),
      document.getElementById('spot3')
    ];
    const dots = document.querySelectorAll('.dot');
    const playIcon = document.getElementById('playIcon');
    const playLabel = document.getElementById('playLabel');

    function setStep(index) {
      currentStep = index;
      
      stepBtns.forEach((btn, i) => {
        btn.classList.toggle('active', i === currentStep);
      });

      spotlights.forEach((spot, i) => {
        spot.classList.toggle('active', i === currentStep);
      });

      dots.forEach((dot, i) => {
        dot.classList.toggle('active', i === currentStep);
      });
    }

    function nextStep() {
      setStep((currentStep + 1) % 3);
    }

    function startAutoPlay() {
      stopAutoPlay();
      timer = setInterval(nextStep, 3400);
      playing = true;
      playIcon.textContent = '⏸';
      playLabel.textContent = 'Auto';
    }

    function stopAutoPlay() {
      if (timer) clearInterval(timer);
      timer = null;
      playing = false;
      playIcon.textContent = '▶';
      playLabel.textContent = 'Play';
    }

    function togglePlay() {
      if (playing) {
        stopAutoPlay();
      } else {
        nextStep();
        startAutoPlay();
      }
    }

    // Initialize auto-cycling
    startAutoPlay();
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Frequency Response Comparison</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      width: 100%;
      min-height: 100vh;
      background: transparent;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      user-select: none;
      -webkit-user-select: none;
      padding: 12px 8px;
    }
    .chart-wrapper {
      position: relative;
      width: 100%;
      max-width: 650px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .legend {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 20px;
      font-size: 13.5px;
      font-weight: 600;
      flex-wrap: wrap;
      padding: 0 4px;
    }
    .legend-item {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #1e2945;
    }
    .legend-line {
      width: 22px;
      height: 3px;
      border-radius: 2px;
    }
    .line-ref {
      background: #94a3b8;
      border-top: 2px dashed #94a3b8;
      height: 0;
    }
    .line-mic {
      background: #0284c7;
      height: 3.5px;
    }
    .svg-container {
      position: relative;
      width: 100%;
      aspect-ratio: 16 / 10;
      min-height: 240px;
      max-height: 380px;
    }
    svg {
      width: 100%;
      height: 100%;
      display: block;
      overflow: visible;
    }
    .grid-line {
      stroke: #e2e8f0;
      stroke-width: 1;
      stroke-dasharray: 2 2;
    }
    .grid-line-major {
      stroke: #cbd5e1;
      stroke-width: 1;
    }
    .axis-zero {
      stroke: #94a3b8;
      stroke-width: 1.5;
    }
    .axis-label {
      font-size: 12px;
      fill: #475569;
      font-weight: 500;
      font-family: inherit;
    }
    .axis-title {
      font-size: 11.5px;
      fill: #64748b;
      font-weight: 600;
      letter-spacing: 0.02em;
    }
    .peak-band {
      fill: #06b6d4;
      opacity: 0.12;
      transition: opacity 0.2s ease, fill 0.2s ease;
      cursor: pointer;
    }
    .peak-band.active, .peak-band:hover {
      opacity: 0.28;
      fill: #0891b2;
    }
    .band-label {
      font-size: 12px;
      font-weight: 700;
      fill: #0891b2;
      text-anchor: middle;
      pointer-events: none;
    }
    .curve-ref {
      stroke: #94a3b8;
      stroke-width: 2.2;
      stroke-dasharray: 6 5;
      fill: none;
    }
    .curve-mic {
      stroke: #0284c7;
      stroke-width: 3.5;
      fill: none;
      stroke-linecap: round;
      stroke-linejoin: round;
      filter: drop-shadow(0 2px 4px rgba(2, 132, 199, 0.25));
    }
    .tooltip-box {
      position: absolute;
      pointer-events: none;
      background: #0f172a;
      color: #ffffff;
      padding: 8px 12px;
      border-radius: 8px;
      font-size: 12px;
      font-weight: 500;
      text-align: center;
      box-shadow: 0 4px 14px rgba(15, 23, 42, 0.25);
      transform: translate(-50%, -100%);
      transition: opacity 0.2s ease, transform 0.2s ease;
      opacity: 0;
      z-index: 20;
      white-space: nowrap;
    }
    .tooltip-box.visible {
      opacity: 1;
      transform: translate(-50%, -115%);
    }
    .tooltip-title {
      color: #38bdf8;
      font-weight: 700;
      font-size: 12.5px;
      margin-bottom: 2px;
    }

    @media (max-width: 480px) {
      .legend {
        font-size: 12px;
        gap: 12px;
      }
      .axis-label {
        font-size: 11.5px;
      }
      .tooltip-box {
        font-size: 11px;
        padding: 6px 9px;
        white-space: normal;
        max-width: 200px;
      }
      .tooltip-title {
        font-size: 11.5px;
      }
    }
  </style>
</head>
<body>

  <div class="chart-wrapper" id="chartWrapper">
    <div class="legend">
      <div class="legend-item">
        <span class="legend-line line-ref"></span>
        <span>Flat Reference</span>
      </div>
      <div class="legend-item">
        <span class="legend-line line-mic"></span>
        <span>Dynamic Vocal Mic</span>
      </div>
    </div>

    <div class="svg-container" id="svgContainer">
      <div class="tooltip-box" id="tooltip">
        <div class="tooltip-title">Presence Peak</div>
        <div>Boosts consonant clarity &amp; vocal cut</div>
      </div>

      <svg id="svgPlot" viewBox="0 0 560 310" preserveAspectRatio="xMidYMid meet">
        
        <g id="gridGroup"></g>
        <rect id="peakZone" class="peak-band" rx="4" />
        <text id="peakZoneText" class="band-label">3 kHz – 8 kHz</text>
        <path id="pathRef" class="curve-ref" />
        <path id="pathMic" class="curve-mic" />
        <g id="axesGroup"></g>
      </svg>
    </div>
  </div>

  <script>
    const gridGroup = document.getElementById('gridGroup');
    const axesGroup = document.getElementById('axesGroup');
    const peakZone = document.getElementById('peakZone');
    const peakZoneText = document.getElementById('peakZoneText');
    const pathRef = document.getElementById('pathRef');
    const pathMic = document.getElementById('pathMic');
    const tooltip = document.getElementById('tooltip');
    const svgContainer = document.getElementById('svgContainer');

    const padLeft = 48;
    const padRight = 24;
    const padTop = 22;
    const padBottom = 38;

    const width = 560;
    const height = 310;
    const plotW = width - padLeft - padRight;
    const plotH = height - padTop - padBottom;

    const minF = 20;
    const maxF = 20000;
    const minDb = -10;
    const maxDb = 10;

    const logMin = Math.log10(minF);
    const logMax = Math.log10(maxF);

    function getX(f) {
      return padLeft + ((Math.log10(f) - logMin) / (logMax - logMin)) * plotW;
    }

    function getY(db) {
      return padTop + ((maxDb - db) / (maxDb - minDb)) * plotH;
    }

    // Grid & Axis labels
    const freqs = [
      { f: 20, l: '20' }, { f: 50, l: '50' }, { f: 100, l: '100' },
      { f: 200, l: '200' }, { f: 500, l: '500' }, { f: 1000, l: '1k' },
      { f: 2000, l: '2k' }, { f: 5000, l: '5k' }, { f: 10000, l: '10k' },
      { f: 20000, l: '20k Hz' }
    ];

    const dbs = [-10, -5, 0, 5, 10];

    // Draw horizontal grid & labels
    dbs.forEach(db => {
      const y = getY(db);
      const line = document.createElementNS('http://www.w3.org/2000/svg', 'line');
      line.setAttribute('x1', padLeft);
      line.setAttribute('x2', width - padRight);
      line.setAttribute('y1', y);
      line.setAttribute('y2', y);
      line.setAttribute('class', db === 0 ? 'axis-zero' : 'grid-line');
      gridGroup.appendChild(line);

      const label = document.createElementNS('http://www.w3.org/2000/svg', 'text');
      label.setAttribute('x', padLeft - 8);
      label.setAttribute('y', y + 4);
      label.setAttribute('text-anchor', 'end');
      label.setAttribute('class', 'axis-label');
      label.textContent = (db > 0 ? '+' : '') + db + ' dB';
      axesGroup.appendChild(label);
    });

    // Draw vertical grid & labels
    freqs.forEach(item => {
      const x = getX(item.f);
      const line = document.createElementNS('http://www.w3.org/2000/svg', 'line');
      line.setAttribute('x1', x);
      line.setAttribute('x2', x);
      line.setAttribute('y1', padTop);
      line.setAttribute('y2', height - padBottom);
      line.setAttribute('class', [100, 1000, 10000].includes(item.f) ? 'grid-line-major' : 'grid-line');
      gridGroup.appendChild(line);

      const label = document.createElementNS('http://www.w3.org/2000/svg', 'text');
      label.setAttribute('x', x);
      label.setAttribute('y', height - padBottom + 18);
      label.setAttribute('text-anchor', 'middle');
      label.setAttribute('class', 'axis-label');
      label.textContent = item.l;
      axesGroup.appendChild(label);
    });

    // Presence Peak Highlight Box (3 kHz to 8 kHz)
    const x3k = getX(3000);
    const x8k = getX(8000);
    peakZone.setAttribute('x', x3k);
    peakZone.setAttribute('y', padTop);
    peakZone.setAttribute('width', x8k - x3k);
    peakZone.setAttribute('height', plotH);

    const xPeakCenter = (x3k + x8k) / 2;
    peakZoneText.setAttribute('x', xPeakCenter);
    peakZoneText.setAttribute('y', padTop + 16);

    // Dynamic Vocal Mic response function (f -> dB)
    function micResponse(f) {
      let db = 0;
      // Presence peak dome: Gaussian centered at 5 kHz, +5 dB peak
      const dome = 5.0 * Math.exp(-Math.pow(Math.log(f / 5000), 2) / 0.18);
      db += dome;

      // Gentle roll-off above 10 kHz
      if (f > 9000) {
        db -= 5.5 * Math.pow((f - 9000) / 11000, 1.4);
      }
      return db;
    }

    // Generate accurate path points
    const samples = 160;
    let refD = '';
    let micD = '';

    for (let i = 0; i <= samples; i++) {
      const logF = logMin + (i / samples) * (logMax - logMin);
      const f = Math.pow(10, logF);
      const x = getX(f);
      const yRef = getY(0);
      const yMic = getY(micResponse(f));

      if (i === 0) {
        refD += `M ${x.toFixed(1)} ${yRef.toFixed(1)}`;
        micD += `M ${x.toFixed(1)} ${yMic.toFixed(1)}`;
      } else {
        refD += ` L ${x.toFixed(1)} ${yRef.toFixed(1)}`;
        micD += ` L ${x.toFixed(1)} ${yMic.toFixed(1)}`;
      }
    }

    pathRef.setAttribute('d', refD);
    pathMic.setAttribute('d', micD);

    // Tooltip positioning and toggle
    function showTooltip() {
      peakZone.classList.add('active');
      const pctX = (xPeakCenter / width) * 100;
      const peakY = getY(5.0);
      const pctY = (peakY / height) * 100;

      tooltip.style.left = pctX + '%';
      tooltip.style.top = pctY + '%';
      tooltip.classList.add('visible');
    }

    function hideTooltip() {
      peakZone.classList.remove('active');
      tooltip.classList.remove('visible');
    }

    peakZone.addEventListener('mouseenter', showTooltip);
    peakZone.addEventListener('mouseleave', hideTooltip);
    peakZone.addEventListener('touchstart', (e) => {
      e.preventDefault();
      tooltip.classList.contains('visible') ? hideTooltip() : showTooltip();
    });

    // Brief discovery pulse on load
    setTimeout(showTooltip, 600);
    setTimeout(hideTooltip, 3000);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: #ffffff;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      user-select: none;
      -webkit-user-select: none;
    }

    .toolbar {
      display: flex;
      gap: 6px;
      margin-bottom: 10px;
      flex-wrap: wrap;
      justify-content: center;
      width: 100%;
      max-width: 580px;
    }

    .btn-tab {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #1e2945;
      padding: 5px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    }

    .btn-tab.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
    }

    .svg-container {
      width: 100%;
      max-width: 580px;
      position: relative;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }

    .grid-line { stroke: #f1f5f9; stroke-width: 1; }
    .axis-line { stroke: #cbd5e1; stroke-width: 1.5; }
    .axis-label { font-size: 11px; fill: #64748b; font-weight: 500; text-anchor: middle; }
    
    .panel-box {
      fill: #fafafa;
      stroke: #e2e8f0;
      stroke-width: 1;
      rx: 8;
    }

    .panel-title {
      font-size: 12px;
      font-weight: 700;
      fill: #1e2945;
      letter-spacing: 0.3px;
    }

    .vowel-area {
      fill: #f59e0b;
      fill-opacity: 0.25;
      stroke: #d97706;
      stroke-width: 2.5;
      transition: fill-opacity 0.3s ease, stroke-width 0.3s ease;
    }

    .consonant-area {
      fill: #3b82f6;
      fill-opacity: 0.25;
      stroke: #2563eb;
      stroke-width: 2.5;
      transition: fill-opacity 0.3s ease, stroke-width 0.3s ease;
    }

    .ear-curve {
      fill: #8b5cf6;
      fill-opacity: 0.2;
      stroke: #7c3aed;
      stroke-width: 2.5;
      transition: fill-opacity 0.3s ease, stroke-width 0.3s ease;
    }

    .guide-line {
      stroke: #0284c7;
      stroke-width: 1.5;
      stroke-dasharray: 4 4;
      transition: opacity 0.3s ease;
    }

    .badge-amber {
      fill: #fef3c7;
      stroke: #d97706;
      stroke-width: 1;
      rx: 4;
    }
    .badge-blue {
      fill: #dbeafe;
      stroke: #2563eb;
      stroke-width: 1;
      rx: 4;
    }
    .badge-purple {
      fill: #f3e8ff;
      stroke: #7c3aed;
      stroke-width: 1;
      rx: 4;
    }

    .badge-text-amber { font-size: 11px; font-weight: 700; fill: #b45309; text-anchor: middle; }
    .badge-text-blue { font-size: 11px; font-weight: 700; fill: #1d4ed8; text-anchor: middle; }
    .badge-text-purple { font-size: 11px; font-weight: 700; fill: #6d28d9; text-anchor: middle; }

    .dimmed { opacity: 0.18 !important; }
    .highlight { stroke-width: 3.5 !important; fill-opacity: 0.45 !important; }
  </style>
</head>
<body>

  <div class="toolbar">
    <button class="btn-tab active" data-mode="all">All</button>
    <button class="btn-tab" data-mode="vowels">Vowels (Power)</button>
    <button class="btn-tab" data-mode="consonants">Consonants (Clarity)</button>
    <button class="btn-tab" data-mode="ear">Ear Resonance (3.5 kHz)</button>
  </div>

  <div class="svg-container">
    <svg viewBox="0 0 540 370">
      <defs>
        
        <linearGradient id="vowelGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#f59e0b" stop-opacity="0.4"/>
          <stop offset="100%" stop-color="#f59e0b" stop-opacity="0.02"/>
        </linearGradient>
        <linearGradient id="consonantGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#3b82f6" stop-opacity="0.4"/>
          <stop offset="100%" stop-color="#3b82f6" stop-opacity="0.02"/>
        </linearGradient>
        <linearGradient id="earGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#8b5cf6" stop-opacity="0.35"/>
          <stop offset="100%" stop-color="#8b5cf6" stop-opacity="0.02"/>
        </linearGradient>
      </defs>

      
      <rect x="20" y="10" width="500" height="155" class="panel-box"/>
      <text x="35" y="32" class="panel-title">Speech Acoustic Energy</text>

      
      <rect x="20" y="180" width="500" height="155" class="panel-box"/>
      <text x="35" y="202" class="panel-title">Human Ear Canal Sensitivity</text>

      
      
      <line x1="60" y1="38" x2="60" y2="330" class="grid-line"/>
      <line x1="280" y1="38" x2="280" y2="330" class="grid-line"/>
      <line x1="398" y1="38" x2="398" y2="330" class="grid-line"/>
      <line x1="474" y1="38" x2="474" y2="330" class="grid-line"/>

      
      <g id="guide-group">
        <line x1="398" y1="38" x2="398" y2="330" class="guide-line"/>
        <circle cx="398" cy="98" r="4" fill="#2563eb"/>
        <circle cx="398" cy="235" r="4" fill="#7c3aed"/>
      </g>

      
      <path id="curve-vowels" class="vowel-area" fill="url(#vowelGrad)"
            d="M 50 145 
               C 80 140, 100 55, 140 55 
               C 180 55, 230 115, 280 145 
               Z"/>

      
      <path id="curve-consonants" class="consonant-area" fill="url(#consonantGrad)"
            d="M 330 145 
               C 365 140, 385 95, 400 95 
               C 425 95, 455 125, 480 145 
               Z"/>

      
      <g id="badge-vowels">
        <rect x="75" y="62" width="130" height="22" class="badge-amber"/>
        <text x="140" y="77" class="badge-text-amber">Vowels (Power)</text>
      </g>

      <g id="badge-consonants">
        <rect x="333" y="62" width="135" height="22" class="badge-blue"/>
        <text x="400.5" y="77" class="badge-text-blue">Consonants (Clarity)</text>
      </g>

      
      <path id="curve-ear" class="ear-curve" fill="url(#earGrad)"
            d="M 50 315 
               C 120 310, 240 295, 330 270 
               C 375 255, 390 235, 398 235 
               C 406 235, 425 255, 450 280 
               C 475 305, 495 315, 500 315 
               Z"/>

      
      <g id="badge-ear">
        <rect x="315" y="278" width="165" height="22" class="badge-purple"/>
        <text x="397.5" y="293" class="badge-text-purple">Ear Canal Resonance</text>
      </g>

      
      <line x1="40" y1="345" x2="500" y2="345" class="axis-line"/>
      <text x="60" y="360" class="axis-label">100 Hz</text>
      <text x="280" y="360" class="axis-label">1 kHz</text>
      <text x="398" y="360" class="axis-label" font-weight="700" fill="#0284c7">3.5 kHz</text>
      <text x="474" y="360" class="axis-label">8 kHz</text>
    </svg>
  </div>

  <script>
    const buttons = document.querySelectorAll('.btn-tab');
    const vowelElements = [document.getElementById('curve-vowels'), document.getElementById('badge-vowels')];
    const consonantElements = [document.getElementById('curve-consonants'), document.getElementById('badge-consonants')];
    const earElements = [document.getElementById('curve-ear'), document.getElementById('badge-ear')];
    const guideGroup = document.getElementById('guide-group');

    function setHighlight(mode) {
      buttons.forEach(btn => btn.classList.toggle('active', btn.dataset.mode === mode));

      // Reset states
      const allEls = [...vowelElements, ...consonantElements, ...earElements];
      allEls.forEach(el => {
        el.classList.remove('dimmed', 'highlight');
      });
      guideGroup.classList.remove('dimmed');

      if (mode === 'vowels') {
        consonantElements.forEach(el => el.classList.add('dimmed'));
        earElements.forEach(el => el.classList.add('dimmed'));
        vowelElements[0].classList.add('highlight');
        guideGroup.classList.add('dimmed');
      } else if (mode === 'consonants') {
        vowelElements.forEach(el => el.classList.add('dimmed'));
        earElements.forEach(el => el.classList.add('dimmed'));
        consonantElements[0].classList.add('highlight');
      } else if (mode === 'ear') {
        vowelElements.forEach(el => el.classList.add('dimmed'));
        consonantElements[0].classList.add('highlight');
        earElements[0].classList.add('highlight');
      }
    }

    buttons.forEach(btn => {
      btn.addEventListener('click', () => setHighlight(btn.dataset.mode));
    });
  </script>
</body>
</html>

Transducer Types: Dynamic Moving-Coil Microphones

Transducer Types: Condenser and Electrostatic Microphones

Electret Condenser Capsules and Pre-Polarised Dielectrics

Phantom Power: +48V Distribution and DC Voltage Biasing

Transducer Types: Ribbon Microphones and Velocity Transduction

Active versus Passive Ribbon Microphones

Valve and Tube Condenser Microphones

Diaphragm Mass, Inertia, and Transient Response

Large-Diaphragm versus Small-Diaphragm Condensers

arts

Core Microphone Transducer Physics and Capsule Design

Boundary and Pressure Zone Microphones (PZM)

Piezoelectric Contact Microphones and Transducers

Shotgun Microphones and Acoustic Interference Tubes

Micro-Electro-Mechanical Systems (MEMS) Microphones

Microphone Capsule Suspension and Internal Shock-Mounting

Acoustic Pop Shields and Windscreen Aerodynamics

Output Transformer Design and Transformerless Circuits

Historical Evolution of Microphone Transducers

Specialised Microphones, Acoustic Isolation, and Circuit Topologies

Interpreting Microphone Polar Pattern Diagrams and Off-Axis Colouration

Off-Axis Rejection and Bleed Management on Live Stages

Polar Patterns and the Proximity Effect

Acoustic Distance Factor and Distance Factor Calculations

Random Energy Efficiency and Directivity Index

Subcardioid and Wide-Cardioid Applications

Hemispherical Polar Patterns in Boundary Microphones

Digital Modelling Microphones and Polar Pattern Emulation

Aural Identification of Polar Pattern Colouration

Applied Directional Acoustics and Critical Listening

Low-Frequency Cut Switches and High-Pass Filter Slopes

Pre-Attenuation Pads: Resistive Dividers and Headroom Protection

Transient Response Measurement and Step-Function Analysis

Evaluating Studio Microphone Shootouts and Benchmarking

Calibrated Measurement Microphones and Diffuse-Field Compensation

Decoding A-Level Microphone Specification Exam Questions

Microphone Acoustic Tailoring, Features, and Technical Evaluation

Capturing Vocals and Acoustic String Instruments

Multi-Microphone Acoustic Drum Kit Capture

Kick Drum Miking: In, Out, and Sub-Kick Transducers

Snare Drum Top and Bottom Microphone Alignment

Tom-Tom Capture: Bleed Control and Polar Pattern Selection

Hi-Hat and Ride Cymbal Spot-Miking Techniques

Recording Electric Guitar and Bass Amplifiers

The Fredman Technique for Heavy Guitar Cabinet Tracking

Electric Bass Capture: Combining DI and Microphone Signals

Studio Microphone Techniques: Drums, Electric Guitar, and Bass

Acoustic Guitar Multi-Mic Setups: 12th Fret and Bridge

Grand and Upright Piano Sound Capture

Capturing Brass, Woodwind, and Percussion

String Quartet and Orchestral String Section Tracking

Lead and Backing Vocal Tracking Chains and Technique

Live Room vs Dead Room Recording Environments

Exam Scenario Analysis: Designing Studio Recording Setups

Studio Microphone Techniques: Acoustic Instruments, Vocals, and Session Planning

music-technology

MUSTECH-5.2

MUSTECH-5.2

Aligned learning resources

Related diagrams