HI all. I'm having trouble getting my optoisolator to work correctly. I'm using an NTE 3098 hooked up to an arduino to trigger a camera flash. I've hooked up the flash leads to the collector and emitter prongs on the optoisolator, and the cathode and anode are hooked up to ground and the arduino which triggers the flash.
The issue I'm having is that the circuit is complete between the emitter and the collector all the time, as I'm getting a 3.78V readout from my voltmeter. This means that I can't use the optoisolator to trigger the flash. Why is this happening? Shouldn't the emitter and collector circuit only be closed/complete when the anode and cathode have current running through them, thus lighting the led inside and completing the collector emitter circuit?
The issue I'm having is that the circuit is complete between the emitter and the collector all the time, as I'm getting a 3.78V readout from my voltmeter. This means that I can't use the optoisolator to trigger the flash. Why is this happening? Shouldn't the emitter and collector circuit only be closed/complete when the anode and cathode have current running through them, thus lighting the led inside and completing the collector emitter circuit?