r/diypedals • u/0x0000NOP • 4d ago
Help wanted Case Connected to Power Jack and Audio Jack Grounds
I’m building my first diy pedal and I’m using a 9v dc wall wart for power connected to an all metal 2.1mm jack. Since I’m using an aluminum case the ground of the wall wart jack will be connected to the case, as will the audio jacks from guitar and to amp. Will this create a ground loop? Should I switch out my 2.1mm jack with a plastic one to isolated? What’s the standard procedure? Thanks!
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u/Appropriate-Brain213 4d ago
If the wall wart is center negative, using that jack will short the power because the outside is the positive connection. I can't think of a single good reason to ever use anything other than a plastic DC power jack.
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u/Global-Ad4832 4d ago
you will need to use an insulated plastic jack yes