Hi I have tried to wire up a circuit according to this fritzing example http://fritzing.org/media/projects/o/p/t/optocoupler/images/optocoupler_Optocoupler_1.jpg But I'm using arduino as powersource on both sides (batteries are on charging at the moment) First I didn't thought it was working at …

LED hardly light up with 4n35 optocoupler

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