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.
We found this circuit in an old French documentation from the 70s, but it can be assembled using...
This circuit adjusts the drained current to values up to 20 A, allowing the testing of power...
This half-wave control is used for resistive loads of up to 200W with the TIC106. The diode can be...