Amplify any tiny audio signals about fifty times; and deliver them to a power amplifier cleanly and undistorted. An AGC (automatic gain control) eliminates pops or distortion. This circuit will be useful in boosting the output from tape heads; microphones or a magnetic phono cartridge etc.. The fidelity is very good; use for input to an audio amplifier. Requires a 12V DC power supply at about 100 mA peak.
