This circuit was found in a 1967 Electronic Design. The FET is from that time. Capacitor C is determined by the frequency of the signal worked.
The circuit below was found in the March 1990 issue of Radio Electronics magazine. The circuit...
This circuit was originally suggested in a 1968 publication to generate a white mark (frame) on a...
We found this circuit in a 1980s publication for amateur radio. It consists of an audio amplifier...