Circuit works perfectly without a load, voltage changes from 0 to 12 with manual on. Turn manual switch off and V is still 12vdc - as it should be. Place magnet over Mr. Hall Effect and V drops to 0 - as it should. Over and over. Put the dc motor in place and the curcuit works fine the first time, may two or three. Then the smoke comes out ... Checked connections a billion times, replaced the 8 burned up halls, the npn and the cap -- no luck. The smoke keeps coming out. I am becoming Digikey's favorite customer. The relay is the larger automotive type, the motor is an auto wiper motor. How can the hall be protected, or is there a beefer hall I can use? Thankx in advance,
Glenn