Public learning track
AC Phase Control with Triacs and Diacs
11th Grade · Technology · UK A-Level
9 lessons
Goal
Analyse and design AC phase control circuits using RC phase-shift networks, diacs, and triacs for smooth, bidirectional power control.
Featured Diagrams
Triac Bidirectional Structure and Operating Quadrants
9 lessons
0 of 9 done
- 1Triac Bidirectional Structure and Operating QuadrantsUp nextStart
- 2Diac Breakover Characteristics and Triggering PulsesPremiumNot started yet
- 3RC Phase-Shift Networks in AC Timing CircuitsNot started yet
- 4Calculating Firing Delay Angles in Phase ControlNot started yet
- 5Circuit Diagram and Waveform Analysis of a Triac Lamp DimmerNot started yet
- 6Calculating RMS Load Voltage and Power Under Phase ControlNot started yet
- 7Hysteresis and Flash-on Effects in Simple RC TriggeringNot started yet
- 8Electromagnetic Interference and RF Filtering in Triac CircuitsNot started yet
- 9Inductive Load Commutation and Snubbers in Triac CircuitsNot started yet
Curriculum Framework
11th Grade · Technology · UK A-Level
1
8 lessons
Semiconductor Physics and P-N Junctions
Explain the microscopic conduction mechanisms in intrinsic, n-type, and p-type semiconductors and analyse the operation of p-n junction diodes, LEDs, and photodiodes.
2
7 lessons
Field-Effect Transistors and MOSFET Operation
Analyse the structural physics, channel formation, pinch-off behaviour, and switching and amplification characteristics of enhancement and depletion n-channel MOSFETs.
3
9 lessons
Audio System Architecture and Multi-Stage Preamplifiers
Design and evaluate end-to-end audio systems and multi-stage voltage preamplifiers that satisfy specified voltage gain and bandwidth constraints.
4
9 lessons
Audio Mixers and Active Filter Circuits
Design virtual-earth audio mixer circuits and first-order active filters for bass and treble boost and cut tone control.
5
10 lessons
Power Amplifiers, Efficiency, and Output Stages
Analyse emitter followers, source followers, complementary push-pull output stages, crossover distortion reduction, and power gain in decibels.
6
8 lessons
Audio Digitisation, Sampling, and Dynamic Range
Examine analogue-to-digital conversion of audio signals, evaluating sampling rates, bit resolution, Nyquist criteria, and quantisation distortion.
7
8 lessons
Mains Rectification and Smoothing Networks
Design and analyse half-wave, full-wave centre-tapped, and bridge rectifier circuits with capacitive smoothing filters under varying load conditions.
8
9 lessons
Voltage Regulators and Power Supply Design
Design and analyse discrete and op-amp-based voltage regulator circuits, evaluating load regulation, line regulation, and thermal stability.
9
8 lessons
DC Thyristor Switching and Commutation
Design high-power DC thyristor (SCR) switching circuits and explain latching, holding current, and forced capacitor commutation methods.
10
9 lessons
AC Phase Control with Triacs and Diacs
Analyse and design AC phase control circuits using RC phase-shift networks, diacs, and triacs for smooth, bidirectional power control.
11
8 lessons
Radio Frequency Spectrum and RF Transmission Channels
Evaluate the radio frequency spectrum for data transmission, determining bandwidth allocations, propagation modes, and channel capacities.
12
10 lessons
Amplitude and Frequency Modulation Systems
Analyse and compare amplitude modulation (AM) and frequency modulation (FM) transmitters, receivers, spectral bandwidths, and noise immunity.
13
8 lessons
Optical Fibre Transmission, Attenuation, and Dispersion
Analyse signal propagation in optical fibres using refraction physics and quantify attenuation, modal dispersion, and chromatic dispersion mechanisms.
14
8 lessons
Optoelectronic Transmitters and Receiver Circuits
Design electronic driver circuits for optical emitters and transimpedance receiver preamplifiers for optical photodiodes.