Found in a 90s Radio Electronics, this circuit uses a ceramic capacitor (C1) as a sensor. The operational amplifier is a double 741 of the time.
This distortion circuit was found in an American publication from 1970. It can be assembled with...
We found this circuit in a Radio Electronics magazine from January 1975. The transistors are...
Equivalent operational amplifiers can be used in this circuit of the 1990 Linear Databook,...