Here's a test at 12v, 24v, and 36v, up to around 8 amps or so. It has a snubber of 0.01uF and 4.7Ohm from drain to source. I'll have to use a smaller capacitor for higher voltages, since the power requirement of the resistor goes up with the square of the voltage. At least I think it does. I forgot. haha.