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 a 2006 publication. It can serve as the basis for a microcontrolled...
This circuit was obtained in a 1965 American magazine translation. The photocell can be the type...
We found this amplifier in a publication of 1990, but it can be mounted today with some exchanged...