This is a bit of spin-off on Risa’s thermal controller. Below you can see the “battle plan”. The idea is that this device will be connected to a thermal probe and Arduino UNO and based on the code it will regulate current going to the heater.
And this is a final product – all made by Risa (c).
And bit closer you can see Risa’s Mosfets in a series:
Can’t wait to see it in action 🙂