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To make them easier to find, the schematics on this page have been divided into sections. To jump right to a specific section, click on the appropriate link below.

amplifiers
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simple preamp

this easy-to-build preamp provides good gain to weak audio signals.

single ic preamp

this simple preamp is based on the LM358 single-supply dual op amp.

cartridge amplifier

circuit to amplify sound from a magnetic cartridge - also works with a guitar pickup, which is also usable for sound/touch sensing.

sound detector amp/electret mike amplifier

amplifier to boost signal from an electret microphone element. very sensitive - adjustable by R1.

8 watt amplifier

an eight watt amplifier built around the LM383 power audio amp ic.

16 watt amplifier

this 16-watt amplifier is built around 2 LM383 power audio amp ic's.

sound detectors
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sound detector latch circuit

this circuit latches onto sounds and helps you detect them on intervals.

sound detector tone decoder

this decoder listens for specific sounds picked up on the sound detector amp/electret mike amp

sound generators
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tone generator

this is a variable frequency tone generator built around the 555 timer. the output spans most of the range of human hearing.

warbler

warbler siren made out of two 555 timer ic's.