Sorry for my german answer to a german reply. It was just to use the red and not the brown wire and my answer was, that I used the red one and that it worked for a while, but when I tried to refine the calibration suddenly I got the issue, I described.
I will try to find some mor infos about the issue in the group.
I will check the voltage. I already separated the part where the arduino is soldered to from the rest, but could get no connection to it. I even could not upload the bootloader.
BTW, besides the issue I ran into, I found it very annoying, that turning the pot during the calibration process is producing that loud clicking noise. That's louder than the station I am trying to tune on. So not really helpfull. Would be nice to turn that clicking completely of.
