>>2921698
>>2921684
Okay, so far the circuit works as intended, but only if I omit the 10V zener and replace it with a short. I've checked and double checked the polarity of the diode and it seems fine, so I'm guessing it is in the design? The only other difference is I'm using a light bulb as a load, not the power tool, but that shouldn't matter...
My calculations were done from the following abstract:
https://www.electronics-tutorials.ws/diode/diode_7.html