I want to teach myself how to build a DC temperature controlled circuit, and use a thermo-probe for a closed-loop feedback to dial-in a specific temperature.
For the hot plate, I have the bottom surface of a coffee machine. A metal top, on the bottom looks like ceramic coated, with two leads sticking out where the A/C wires used to go.
I am measuring 9 ohms of resistance between the two leads.
I know how to drive mosfet with a PWM signal. I was going to hook that up to the coffee-plate. Since it's pretty much a short circuit, I suspect that's probably not a good idea. What circuit or device should I use to connect from my pulse signal to drive a 12-volt DC power into this hot-plate?