I found this circuit in a documentation for radio amateurs from 1975. The FET could be the BF245. The circuit works in the range of 40, 80 and 160 meters of radio amateurs.
This circuit was found in a 90s Electronics Now. It generates sinusoidal signals according to the...
This 2006 documentation source contains several built-in regulators that can be adjusted for...
This circuit serves as a reference to learn how signals were decoded in the 1960s. The fully...