What is optocoupler and how to check it

An optocoupler (also called optoisolator) is a semiconductor device that allows an electrical signal to be transmitted between two isolated circuits. Two parts are used in an optocoupler: an LED that emits infrared light and a photosensitive device that detects light from the LED. For Training Purpose Call SK Computer Technologies Mb: 9444180072 / 9841925321 Website: Email: skcom2001@ map location: