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.
In the figure we have a circuit for line receiver (twisted pair) with the possibility of...
This circuit appeared in the November 1995 issue of Electronics Now magazine. The circuit uses...
This circuit was found in a 1987 edition of the United States' Hands On Electronics magazine. The...