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.
This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog...
This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...
This circuit was found in the comparator's own documentation, serving others in the same series. The...