This circuit with automatic gain control was found in the July 1988 issue of Radio Electronics magazine. The circuit is based on a transconductance operational amplifier.
Found in a 1969 documentation this circuit shows how it uses SCRs and transistors to selectively...
This circuit was found in a 1967 US publication. In it we have the implementation of a ring...
We got this circuit in a publication of 1987. This is an audio limiter, a circuit that cuts peaks...