introduction to 4n25, intro to 4n25, basics of 4n25, working of 4n25, principle of 4n25 Hey Fellas! We always strive to give you useful information that resonates with your needs and requirements. Today, I'm going to unlock the details on the Introduction to 4n25. It is a standard single channel 6 pin optocoupler that contains silicon NPN phototransistor and gallium arsenide infrared ...