Hello. I have built a simple stepper circuit that also has three relays that draw 60 or 70 ma as far as I remember. I switched on the 12v power supply and the uln2003a blows in a matter of a few seconds. I do not have the stepper motor wired in yet and the parallel cable is not plugged in yet either. The relays are the only thing wired up right now. There are no shorts and everything looks great. What have I done wrong? I am totally stumped; please help.