This circuit covers the bands from 1.8 to 150 MHz, with plug-in coils whose characteristics are given next to the diagram. The FET can be a BF245. We found it in old documentation.
This circuit was found in a 2001 documentation. It is a test of zener diodes that uses a voltmeter or...
This simple transistor radio with only two germanium transistors was found in a Japanese magazine from...
The presented circuit produces the sound of a fireman's siren. In place of the output transformer with...