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.
This 80's circuit uses a germanium transistor like the AC121. The circuit has an output...
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...