02-27-2007 08:46 PM
02-28-2007 11:08 AM
Add a resistor to the Positive terminal of V1 to the opto-coupler and it works fine. I not exactlysure why the origninal circuit is doing this. I thought the Beakdown Voltage of the opto-coupler diode was being exceeded, but the model indicates that the BV=infinite. Maybe Nestor would know at little more in that area than I do. It could be that with that much voltage it is overdriving the opto-coupler LED in the forward direction and exceeding the maximum forward current. Suffice it to say that with the resistor everything works like it should.