yes stm32f103
Have absolutely no experience with the STM32 processors or development boards, so I can't comment on what might be the issue.
Maybe you should try one of the STMicro forums.
That's ok, before I suspect that there is a problem with the grounding, now I know that the program also plays a role.
I added a DC voltmeter, there is no noise on it, I need to look for another AC voltmeter.
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