This circuit was found in the April 1993 Electronics Now magazine. With it, it is possible to control the gain of an operational circuit with a JFET.
The circuit presented is a simple MW tuner that can be plugged into the input of any audio...
This circuit is from an American 1967 documentation and can be implemented with modern equivalent...
This RF circuit measures transmission power from 0.25 W to 10 W. The maximum frequency depends on...