This current switch was found in a Radio Electronics from November 1957. It triggers the current determined by the electromechanical sensor, a polarized relay of the time.
Found in the August 1970 Radio Electronics magazine, this circuit uses a CA3018 with the trigger...
This circuit was obtained in an old English magazine from 1976. However, the components can still...
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...