Agc System For Audio Signals Circuit

Posted on May 27, 2012

This circuit is an AGC system for audio-frequency signals. AGC systems usually consist of three parts: an amplifier, rectifier, and controlled impedance. In this circuit the functions of an amplifier and a rectifier are performed by a single op amp. This makes the system simple and cheap.The rectifier is made with the output push-pull cascade of the op amp and Rs, RL, and CB. The transistor Ql and D1 are used as a voltage-controlled resistance (Z).

Agc System For Audio Signals Circuit
Click here to download the full size of the above Circuit.

The input signal is (Z + R^/Z times, diminished by the voltage divider and 1 + R2/Ri times, amplified by the op amp. C2 eliminates influence of dc bias voltage. R3 protects Ql and D1 from excessive current.

Leave Comment

characters left:

New Circuits



Popular Circuits

DAC and Headphone Amplifier
5v Regulated Solar Power Supply Circuit
Low voltage detector
6418 Tube RIAA Phono Preamplifier
Flasher and Fader LED Circuit Using IC 555
Processor Fan Control
CMX866 V.22 Bis Modem With AT Commands
Temperature Logger and Standalone Voltage Logger