We found this circuit in the Radio Electronics magazine of May 1977. The circuit has the frequency given by the components according to the formula next to the diagram.
Originally this circuit was designed to power tube transceiver equipment in the car, using a 12 V...
This circuit is from a Radio Electronics from February 1966. The circuit is of a type that was...
This circuit is from a Japanese publication in 1967. The circuit uses a Geiger-Muller valve and...