This is a circuit for receiving signals from the previous transmitter. The circuit uses a common phototransistor. It was found in the August 1984 issue of Radio Electronics magazine.
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...