I am setting up box to trigger 4 cameras at the same time and I just wanted to run this by someone. My OK is a 4 channel device with a forward current of 60mA per channel. I am going to feed 5v through a offboard switch to all 4 channels in parallel. So I add all 4 channels current say 50mA that would be 200mA (.2). So now I divide 5 by .2 and I get 25 ohms. Is that correct? I guess it doesn't matter which side of the OK the resistor goes on either.