Automatic Gain Control - AGC
Automatic Gain Control or AGC is a circuit design which maintain the same level of amplification for sound or radio frequency. If the signal is too low the AGC circuit will increase ( amplify ) the level and if is to high will lower it to maintain a constant level as possible.
The Automatic Gain Control principle is widely use in AM receivers and sometimes AGC is called an compressor-expander because it acts just like one.
On the electroschematics.com site you can find some AGC schematics, just use the seach box.
Mic preamplifier with AGC schematic
Random schematics
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