This VCA was found in the July 1988 issue of Radio Electronics magazine. It uses an OTA op amp and has its gain adjusted by the voltage at the gain input.
The circuit presented was obtained from a 1976 Italian Radio Elettronica but can be easily...
This voltage amplifier with operational amplifier was found in an old documentation. However, it can...
This filter was obtained from Radio Electronics from the 80's. The configuration applies to any...