This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and the coil can be made with 80 to 100 turns of fine enameled wire on a ferrite rod.
September 2017 - Mouser Electronics announces the availability of new MIC28514T series DC-DC...
This circuit can be used as a modulator for TV games. The circuit is from a 1975 publication. The...
We found this wattmeter that operates between 100 kHz and 70 MHz in a 1974 amateur radio...