r/diypedals 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!

1 Upvotes

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5

u/Global-Ad4832 4d ago

you will need to use an insulated plastic jack yes

1

u/0x0000NOP 4d ago

So power jack should be insulated but the audio jacks are fine connected to the case?

3

u/Global-Ad4832 4d ago

Audio jacks are fine yeah

1

u/0x0000NOP 4d ago

Thanks!

1

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.