Preamplifiers circuit diagrams

Guitar Preamp

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.

Stereo Line Driver

A stereo line driver for feeding long cables or buffering an audio source.

Audio Voice-Over Circuit

This is a circuit where a microphone and preamp circuit (voice circuit) have priority over any other audio signal. You can think of this as a one way intercom, if the main amplifier is used for listening to music, then when the push to talk switch is pressed, the amplifier is switched to the voice signal.