Suggested by a 90s Radio Elecrtronics, this circuit is intended to supply mobile equipment of the time. The transformer data is given next to the diagram.
This simple electroscope with bipolar transistors is not the most sensitive, but can detect static...
This oscillator for various frequencies was obtained from a 1980s telecom documentation. The...
This circuit is from a July 1970 Radio Electronics magazine. The sensors are metal probes. The 18 V...