Public learning track
Audio Mixers and Active Filter Circuits
11th Grade · Technology · UK A-Level
9 lessons
Goal
Design virtual-earth audio mixer circuits and first-order active filters for bass and treble boost and cut tone control.
Featured Diagrams
Summing Amplifier Theory and Virtual Earth Concept
9 lessons
0 of 9 done
- 1Summing Amplifier Theory and Virtual Earth ConceptUp nextStart
- 2Designing Multi-Channel Audio Mixers with Weighting ResistorsPremiumNot started yet
- 3Variable Gain Faders and Panning Circuits in MixersNot started yet
- 4Active Low-Pass Filters and Bass-Cut CircuitsNot started yet
- 5Active High-Pass Filters and Treble-Cut CircuitsNot started yet
- 6Active Bass-Boost Filter Analysis and DesignNot started yet
- 7Active Treble-Boost Filter Analysis and DesignNot started yet
- 8Calculating Break Frequencies and Roll-off RatesNot started yet
- 9Complete Baxandall and Active Equaliser NetworksNot started yet
Standards Covered
- ELEC-19.3General Certificate of Education Advanced Level (UK A-Level) · Electronics · Year 13 (A2 Level) · Grade 11the analysis and design of a mixer circuit based upon a summing amplifier
- ELEC-19.4General Certificate of Education Advanced Level (UK A-Level) · Electronics · Year 13 (A2 Level) · Grade 11the operation of first order active filters (bass boost, treble boost, bass cut, treble cut) including calculation of the break frequency
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.