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.
This old circuit for circuit breaker cars was found in a 1963 publication. The transistors are...
In the figure we have an infrared receiver circuit using an operational 741. The circuit is an...
May 18, 2015 - Mouser Electronics, Inc., the global authorized distributor with the newest...