There are 111 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Tuesday, July 11, 2017.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
Parabolic microphone project circuit (can be used with shotgun directional microphone also)AudioSep 23, 2009Status-5 vote up vote down
Using a speaker as a microphone - impedance matching circuitAudioSep 23, 2009Status-2 vote up vote down
Stereo audio simulatorAudioMar 23, 2015Status2 vote up vote down
White / LF noise generatorAudioDec 07, 2014Status-1 vote up vote down
Wind Sound GeneratorAudioOct 25, 2014Status1 vote up vote down
Audio Indicator - monitor a loudspeaker, alarm, or audio source for presence of an audio waveformAudio Status0 vote up vote down
Stereo Audio IsolatorAudio Status0 vote up vote down
Voltage Controlled PannerAudio Status2 vote up vote down
Voice-Over CircuitAudio Status-1 vote up vote down
Underwater microphone used in a home aquarium to monitor fish soundsAudio Status0 vote up vote down
Room Noise DetectorAudioJun 26, 2009Status0 vote up vote down
Novel buzzer using a relay and transformerAudioJun 26, 2009Status-1 vote up vote down
Cuckoo sound GeneratorAudio Status2 vote up vote down
Electronic CanaryAudio Status0 vote up vote down
Assortment of Siren CircuitsAudioSep 17, 2009Status0 vote up vote down
Three channel audio spectrum analyzerAudioOct 21, 2009Status0 vote up vote down
Precision Audio MillivoltmeterAudioSep 17, 2009Status1 vote up vote down
Digital Volume Control based around CD4067 CMOS chipsAudioOct 19, 2009Status0 vote up vote down
Three-Level Audio Power IndicatorAudioOct 19, 2009Status0 vote up vote down
Voice ScramblerAudioAug 12, 2009Status0 vote up vote down
Voice / Audio Record / Playback CircuitAudioAug 12, 2009Status0 vote up vote down
Build a Tape Linearizer and a Distortion AnalyzerAudioApr 14, 2010Status0 vote up vote down
Peak-reading metersAudioJan 26, 2001Status0 vote up vote down
Audio Spectrum Analyzer and Equalizer DesignsAudioMar 30, 2010Status-1 vote up vote down
Defeating SCMS on DAY recorders using a Sony CXD2601 chipAudioMay 07, 2010Status0 vote up vote down
Binaural Synthesizer/Mono to Stereo Converter for Small Speaker/PhonesAudioOct 03, 2013Status-1 vote up vote down
Powerline Carrier System Transmitter for Audio (Music/Speech)AudioOct 03, 2013Status0 vote up vote down
CMOS IC 1 kHz Audio OscillatorAudio Status1 vote up vote down
Two Tone Audio OscillatorAudio Status-1 vote up vote down
Microcontroller (AT89C2051) based tachometer (PDF)AudioNov 13, 2010Status0 vote up vote down
Spring reverb unitAudioJan 26, 2001Status0 vote up vote down
Voice Message Recorder / Player (uses an obsolete voice recorder chip)Audio Status0 vote up vote down
Cicuit diagram for super long range microphone for use with a shotgun microphone or parabolic dishAudioFeb 20, 2010Status-1 vote up vote down
Home theater systemAudioMay 24, 2010Status0 vote up vote down
Better Volume (and Balance) control circuit diagramsAudioApr 14, 2010Status0 vote up vote down
Simple surround sound decoder circuit schematicAudioApr 14, 2010Status1 vote up vote down
Parametric And Sub-Woofer EqualiserAudioApr 14, 2010Status0 vote up vote down
High Quality Audio MixerAudioMar 17, 2010Status0 vote up vote down
Loudspeaker Protection and MutingAudioJan 29, 2010Status-1 vote up vote down
VU And PPM Audio MeteringAudioMay 07, 2010Status0 vote up vote down
Low frequency / audio frequency dB output meterAudio Status-1 vote up vote down
Audio Signal SourceAudioOct 30, 2002Status0 vote up vote down
Audio graphic equaliserAudioAug 12, 2001Status-1 vote up vote down
3 Channel Spectrum AnalyzerAudioSep 01, 2009Status0 vote up vote down
FET Audio MixerAudioSep 01, 2009Status0 vote up vote down
Microphone MixerAudioSep 01, 2009Status0 vote up vote down
Mono To Stereo Synthesizer / SimulatorAudioSep 01, 2009Status0 vote up vote down
Tone Control using TDA1524A Tone Control ICAudioSep 01, 2009Status-1 vote up vote down
Digital Volume Control using DS1669 Digital Pot ICAudioSep 01, 2009Status0 vote up vote down
Sound Level MeterAudioSep 01, 2009Status0 vote up vote down
Simple Audio Tone Control CircuitAudioFeb 21, 2013Status1 vote up vote down
Very loud beeper (PDF)AudioJan 26, 2001Status0 vote up vote down
Digital noise generator (PDF)AudioJan 26, 2001Status0 vote up vote down
Tone display systemAudioOct 30, 2002Status0 vote up vote down
Simple electronic buzzerAudio Status0 vote up vote down
Big Ben sound effects generatorAudio Status-1 vote up vote down
Clack Clack Electronic BellAudio Status1 vote up vote down
Musical Electronic BellAudio Status0 vote up vote down
Digital volume controlAudioFeb 21, 2005Status-1 vote up vote down
Electronic attenuatorAudioFeb 21, 2005Status2 vote up vote down
Speech recorded using ISD2560AudioFeb 21, 2005Status0 vote up vote down
Cuckoo sound generatorAudioFeb 21, 2005Status0 vote up vote down
Audio line isolatorAudioJan 26, 2001Status0 vote up vote down
Dynamic microphone to electret microphone inputAudioJan 26, 2001Status-1 vote up vote down
Line level signal to microphone input adapterAudioJan 26, 2001Status-1 vote up vote down
Simple two line output combinerAudioJan 26, 2001Status0 vote up vote down
Electret microphone powering circuitsAudioJan 26, 2001Status-1 vote up vote down
Speaker signals to line level inputsAudioJan 26, 2001Status0 vote up vote down
Minimum Theremin Kit SchematicAudioSep 13, 2006Status0 vote up vote down
RC Audio OscillatorAudio Status0 vote up vote down
Subwoofer Filter, Gainer, Auto Power SystemAudio Status0 vote up vote down
Microphone phantom power supplyAudioJan 31, 2003Status1 vote up vote down
Dual Voltage Controlled Oscillator w/ModulatorAudioJun 08, 2002Status1 vote up vote down
MS Stereo DecoderAudioJun 08, 2002Status0 vote up vote down
RDS EncoderAudioMar 27, 2009Status0 vote up vote down
Improved PL tone decoderAudioJan 26, 2001Status0 vote up vote down
Audio Speech ProcessorAudio Status0 vote up vote down
Sound detector circuit diagramAudioJan 26, 2001Status-1 vote up vote down
Tone detector circuit diagramAudioJan 26, 2001Status0 vote up vote down
Tone generator circuit diagramAudioJan 26, 2001Status0 vote up vote down
Warbler siren circuit diagramAudioJan 26, 2001Status0 vote up vote down
Sound pressure level meter circuit diagramAudio Status0 vote up vote down
An Audio Limiter for NBFM useAudio Status0 vote up vote down
An Audio-Noise-Based Voting CircuitAudio Status0 vote up vote down
Speaker cabinet simulator - professional-quality frequency response in a DIY-friendly circuitAudioSep 30, 2009Status0 vote up vote down
Sound operated switchAudioAug 17, 2009Status0 vote up vote down
Audio Detector CircuitAudioOct 06, 2006Status1 vote up vote down
Sound activated relay, V1Audio Status0 vote up vote down
Sound activated relay, V2Audio Status0 vote up vote down
Voltage Controlled PannerAudioSep 21, 2006Status0 vote up vote down
Guitar Reverb Effect Version 2AudioSep 21, 2006Status0 vote up vote down
Stereo Audio IsolatorAudioSep 21, 2006Status0 vote up vote down
Panner Waveform GeneratorAudioSep 21, 2006Status0 vote up vote down
Voltage controlled audio pannerAudioAug 01, 2010Status0 vote up vote down
Voltage Controlled PannerAudioJan 26, 2001Status1 vote up vote down
An Ultra Low Distortion Audio Test OscillatorAudioJun 24, 2015Status0 vote up vote down
3-Band audio graphic equalizerAudioJan 26, 2001Status0 vote up vote down
6-Input mixer circuit diagramAudioJan 26, 2001Status0 vote up vote down
Doorphone intercomAudioJan 26, 2001Status0 vote up vote down
Stereo audio line driver for running audio over long distance cablesAudioJan 26, 2001Status0 vote up vote down
Tone control circuit schematicAudioJan 26, 2001Status0 vote up vote down
Speaker Microphone CircuitAudioNov 27, 2002Status0 vote up vote down
Electronic canary sound effectsAudioJan 26, 2001Status0 vote up vote down
Electronic sirenAudioNov 27, 2002Status1 vote up vote down
Envelope generator ADSRAudio Status-2 vote up vote down
Beat Tracking StrobeAudio Status0 vote up vote down
Two-Tone Siren Using One 4093 ICAudioJul 15, 2015Status0 vote up vote down
Whistling KettleAudioJul 30, 2015Status0 vote up vote down
Room Noise Detector Circuit SchematicAudioJul 30, 2015Status-1 vote up vote down
VOX circuit diagram (voice operated relay)AudioOct 02, 2016Status0 vote up vote down
Noise Canceling Electret Microphones - WB9YBMAudioOct 22, 2016Status0 vote up vote down