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.
The CMOS PLL used on this circuit is not very common. The circuit can be used to take out contact...
We found this circuit in the Radio Electronics magazine of February 1993. The main integrated...
This circuit was found in Motorola documentation from 1968. SCRs can be modern equivalents and the...