This circuit for communications receivers was found in the January 1974 issue of Radio Electronics magazine. The transistors are Japanese types of the time, as the circuit was part of equipment of that origin.
Suggested by a 90s Radio Elecrtronics, this circuit is intended to supply mobile equipment of the time....
Cutting off the light that falls on the LDR causes the relay to be triggered. The light source may be...
When this circuit is activated the LED flashes for a moment indicating that the function has been...