Re: Really universal soldering controller Reply #2895 – May 23, 2020, 01:12:36 pm Hi,now, that is a very interesting thought, and it also seems to be the right place to start looking. Because, the voltage across C10 is 0,7 V, which in my opinion is everything else but close to 0 V. Tracing the problem back to the µC lead me to a broken pulldown resistor for U3 (R21 was bad). Replacing it did not change anything, but ONOFF seems to be having a duty cycle of 50% (at least the voltage of the ONOFF trace is ~1,7 V, measured at U3A:2 and U5:2).As I am writing this, I reflowed pins U5:2 and U5:3. That solved the temperature problem, indeed. Now, onto the next problem: the lab supply I'm using seems to struggle with providing the required power. It did work in the past, it's specified for up to 8 A, but I guess that's a problem not related to Unisolder but rather something I have to solve on my end. The supply is like 30 years old... Will report back testing with a different supply.For now I really want to thank you guys for supporting me and leading me to the solution!