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Need help with ground loop

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laejf:
I don't know if anyone is interested, but I managed to erase pretty much all noise by focusing on the 3.5mm cable connected to the BT-module instead of the feeding of the module. I replaced it with a short microphone-cable soldered to the module and amplifier-board this makes it a bit less modular and flexible but at least i know what to think of when/if I'm re-designing the board. Thank you for your suggestions!

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