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More hiss from external powered wah? Answered

I put together a gig box with power, and everything is fine.only problem is I have a George Dennis wah at the beginning of the chain, with a battery it is just fine. It has a power jack mini plug ts connector. Tip is positive and ring is ground. I am a technician , so I made a cord from the gig box power supply, reversed the tip and ring, because the ring is positive with guitar toys, it works but now I have a lot of hiss, more than normal, I use a nova drive of distortion and have a noise gate. When I unplug the power from the wah the hiss normalizes.
if I use an external power supply for the wah it is ok.
Used a meter and the power is correct 9.3 volts dc.
Not sure what to make of this?

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JosephR154
JosephR154

4 years ago

I took a ground from the outlet and touched all grounds on all devices, no change, I am going to have to use a battery in the wah for now.

But I never give up! I am sure you guys are the same way.

Going to try a few more things before I resort to a separate transformer.

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iceng
iceng

4 years ago

Reversing tip and ring my have put the wire shield inside and the signal outside on a coax cable unless it's a twisted pair... That can cause unexpected results..

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JosephR154
JosephR154

Answer 4 years ago

Thanks, I tried both types, twisted pair same result, I hate to put another transformer on my board, as with every guitarists pedal board, eventually has no real estate left.
Would a diode on the positive maybe help?
Thanks again.

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iceng
iceng

Answer 4 years ago

Diodes have a voltage step that might give you a plosive "Ba.Wah" sound.

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Downunder35m
Downunder35m

4 years ago

It might be enough to really put everything connected to common ground.
Back in the good old days all my amps and other equippment had seperated ground connectors.
Looped and put onto a good earth connection meant I never had any problems.
Of course it could also be that your power supply is just crap for job at hand or that other equippment is causing the interference.