We found this circuit in the April 1978 issue of Radio Electronics magazine. The power supply must be symmetrical, and the maximum recommended frequency is around 10MHz.
Found in a magazine 73 for radio amateurs of the 90s, this circuit shows how to supply a photo...
Using NPN transistors, this circuit activates a voltage relay according to the power supply. The...
This circuit causes a green LED to light up when we step on the brakes and the rear lamps to light...