This circuit was published in Radio Electronics magazine in June 1959. The circuit uses an inverter with transformer to generate the high voltage of the Geiger tube.
The battery charger suggested in the figure has its current limited by resistor R1. This component may...
This interesting 80's EDN circuit divides the input pulse frequency by a number given by n...
This circuit was found in a 1969 CQ magazine. It is intended for coupling telephones to radio...