This circuit was found in an Experimenters Handbook of the 1990s. The purpose of this circuit is to keep constant the audio signal level of a system, increasing the lower signals.
This two-transistor circuit is from a December 1964 Radio Electronics. Modern transistors can be...
Here we have a circuit suggested by Texas lnstruments that consists of a receiving stage that has...
This circuit was found in a 1964 documentation. It shows how to achieve automatic gain control for...