Could you either put in an insulating section into the rotary encoder shaft or fit an earthing 'wiper' onto the knob?
ESDs aren't as common as they once were, components tend to be more robust now.
I will answer my question myself... I should indeed have used a non-metallic knob, or have replaced the rotary encoder on the PCB by one with a plastic shaft.
But since I really like this aluminum knob and don't want to replace the rotary encoder on the PCB, I will try to find a way to insulate the knob from the rotary shaft somehow.
I guess this was a stupid beginner's mistake. Even though this is the first time I ever built something, I should have known better...
Deleted as duplicate of previous post.Edited by Guest
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