This circuit is from a 1967 Triplett manual. The circuit uses components of the time, the common FET and the general-purpose bipolar transistor.
This interesting sensor for RF signals was found in an article in the June 1989 Radio Electronics...
The frequency of this oscillator depends on the inductor and capacitors in parallel with it. In...
This circuit was found in RCA and General Electric documentation from the 1980s. The circuit has...