This optical coupler for short distances is powered by 12 V which is the voltage of the lamp and the relay. The circuit can also use emitting LEDs and the phototransistor can be of any type.
Found in a 1990s Popular Electronics, this circuit uses two transistors to boost the power of a...
This compressor circuit was obtained in a Motorola manual from the 80's. The components are from...
September 2016 – At Mouser Electronics is available audio drivers for the purpose of suitable...