Found in an American documentation from the 90s, this circuit has a configuration that has been extensively explored in other articles on this site. The FET can be the MPF102 or equivalent.
The main feature of this circuit is that it provides a sine waveform signal. In this circuit, the...
This circuit behaves as a voltage controlled resistor and can serve as a small load. The circuit is...
The circuit presented, from a 2005 documentation, can provide from 1 W to 2.5 W of output when...