This circuit is from an old American amateur radio manual. The circuit shows how to use a Varicap on a high power frequency doubler circuit.
This circuit was found in a 1980s documentation. Q1 and Q2 can be BC548 and SCR a TIC106. The...
This circuit is from an 80's publication. The basic components indicated are of the time, mainly...
This interesting multivibrator was found in an Italian magazine that no longer exists. This is...