Please, I am having this challenges using my 4 pin opto coupler I need the best and reliable design on how to bias my c945 transistor from pin 3 and 4 in order to operate 12v relay on 12 v battery. I
cant read the number printed on the opto coupler I need a general approach.
thanks
cant read the number printed on the opto coupler I need a general approach.
thanks
Last edited: