Re: KSGER STM32 T12 soldering stations

Hi,
I have an KSGER T12, which kept detecting movement of the handle even so the handle was resting in the cradle. Looking at the schematics of the control board that must mean that the 3.3V on the input at the STM32 must be missing.
Measuring with a normal multimeter everything looked fine. Stable 24V of supply and 3.3V at the chip.
After poking around with an oscilloscope I found that I have really short drops in the supply voltage, which I guess lead to the 3.3V missing.
After attaching the control board to a...