The purpose of this circuit found in an old Elektor is to light a lower power lamp when the bigger one burns out. The loads depend on the triacs.
This circuit causes a green LED to light up when we step on the brakes and the rear lamps to light...
This is a small audio amplifier for headphones for experimental receivers. The transistor can be...
Found in an old publication, this circuit uses an analog milliammeter to indicate the position of a...