Irf520 vs irf540
Putting in the IRF540 causes the motor to run away completely. The FET also gets really warm. My guess is that there's not enough internal resistance in the IRF540 FET (0.27ohm in the 520 versus 0.07ohm in the 540) to keep the motor from running away and it needs a second resistor. Where would I put that second resistor in?.