Audio circuit diagrams
A 24 Watt Class A Amplifier made from discrete semiconductors, built and tested by Marc Klynhans from South Africa.
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A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance.
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Output power: 6W into 4 Ohm load. FET input stage - Passive Tone Control
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A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. The op-amp used can be any low noise, high performance type, e.g. NE5534,TL071, OPA 371 etc.
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A small battery driven amplifier with 200mW output. This is a suitable amplifier for portable radios and other battery powered equipment.
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A pre-amplifier for electric guitars. The guitar pickup is high impedance, therefore good quality screened cable must be used between guitar pickup and the preamp.
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A stereo line driver for feeding long cables or buffering an audio source.
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This circuit can be used to remotely monitor a loudspeaker, alarm, or audio source for presence of an audio waveform. It can also be directly connected across loudspeaker terminals used as a peak indicator.
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A 2 Watt audio amplifier made from discrete components.
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