4N35 is a widely used optocoupler device. The post below covers 4N35 optocoupler pi… | Basic electronic circuits, Electronic schematics, Electronic circuit projects
opto isolator - My optocoupler doesn't give more than 1.86V - Electrical Engineering Stack Exchange
4N35 6-Pin PhotoTransistor Optocoupler Datasheet
4N35 Optocoupler 30V
Pin configuration of 4N35 Opto-coupler | Download Scientific Diagram
Pin configuration of 4N35 Opto-coupler | Download Scientific Diagram