Misc. Audio Schematics
(also see Music, Amplifier, Preamp)

1.5V Audio Amplifier
3 Transistor Audio Amp (50 milliwatt)
3-Band equalizer
555 Tone Generators (8 Ohm Speaker)
6-Input mixer
Active Sub-Woofer and Controller
Amplified ear
Amplifier thermal protection
Amplifier timer
Analog VU meter
Audio frequency meter
Audio graphic equalizer
Audio level indicator
Audio line isolator
Audio mixer
Audio notch filer
Audio Signal Source
Automatic Charger for Battery Operated Hi-Fi Preamps
Automatic gain control (AGC) circuits
Automatic loudness control
Balanced Line Driver & Receiver
Base / treble control circuit using LM1036N
Bell ring generator
Bias circuits
Bridging Adapter For Power Amplifiers
Bull Horn
Code practice oscillator
Condenser microphone hookup
Cuckoo sound generator
Digital Delay Unit For Surround Sound
Digital noise generator (PDF)
Digital volume control
Digital volume control
Direct Injection Box for Recording & PA Systems
Doorphone intercom
Dual Voltage Controlled Filter w/Modulator
Dual Voltage Controlled Oscillator w/Modulator
Dynamic microphone to electret microphone input
Electret microphone powering circuits
Electronic attenuator
Electronic canary
Electronic siren
Electronic siren
Electronic whistle
Fast Audio Peak Limiter
FET audio mixer
High Quality Sound Mixer
Improved PL tone decoder
Intercom preamp
Line level signal to microphone input adapter
Linkwitz Cosine Burst Generator
LM358 preamp
Load Sensing Automatic Switch
Loudspeaker Protection and Muting
Low Frequency Sinewave Generator
Low Noise Balanced Microphone Preamp
Low Noise Microphone Preamplifier
Low Power Op-Amp - Audio Amp (Intercom)
Magnetic cartridge amplifier
Microphone mixer
Microphone phantom power supply
Minimalist Discrete Hi-Fi Preamp
MS Stereo Decoder
MS Stereo Microphone
Noise generator
Paradoxical Sound Syntheizer
Parametric And Sub-Woofer Equaliser
Peak reading audio level meter
Phase shifter
Phono Preamps For All
Power Amplifier Clipping Indicator
Precision audio millivoltmeter
Precision audio millivoltmeter
RIAA Equalized Stereo Phono Preamp
Room noise detector
Room noise detector
Signal Detecting Auto Power-On Unit
Simple amplifier
Simple Surround Sound Decoder
Simple two line output combiner
Simplest Ever Amplifier Bridging
Sine wave generator
Six-channel Mixer and Amplifier
Sound detector
Sound level meter
Sound Mixer/Amplifier
Speaker Microphone Circuit
Speaker signals to line level inputs
Speech recorded using ISD2560
Spring reverb unit
Stereo Ducker
Stereo line driver
Stereo Width Controllers
Subwoofer Equaliser
Surround Sound Decoder Mk2
Three band Active Tone Control
Three channel audio spectrum analyzer
Tone control
Tone control
Tone detector
Tone display system
Tone generator
Tube active crossover
Tube amplifier
Twin-T Audio Sine Wave Oscillator
Two-tone siren
Underwater microphone
Use amplifier phono input as line level input
Variable Amplifier Impedance
Various tube crossover circuits
Very loud beeper (PDF)
Voltage controlled amplifier
Voltage Controlled Mixer w/Modulator
Voltage Controlled Panner
VU And PPM Audio Metering
Warbler

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