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Whats with this buzzing?!?

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#1 brooksey!!!


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Posted 20 July 2010 - 06:51 AM

Right, when i use a certain type of power supply unit (the ones which you can specify the polarity & voltage) with my guitar pedals, i get a horrific buzzing noise. The polarity & voltage is all correct. I'm using all unbalanced jack --> jacks. I have tried it on two of my amps - same results. But when i use a different supply, the buzz goes away. Any ideas? I would use the other power supply, but i need to power about 4 pedals with that polarity so.....

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#2 Nawtheasta


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Posted 21 July 2010 - 11:30 AM

Hi brooksey!!!
My wife does DJ work. Weddings parties and so forth. If you Google “Hum Eliminators” you will find a lot of info.
We incorporate one in the set up that seems to work OK but sometimes at certain venues or towns we always have some hum come through. I also ground everything through our power supply. I am not sure how this may relate to a guitar set-up
You mention that it seems to be one specific power supply. A lot of these are pretty cheaply made in China. You may just have a defective unit. If cost is not too much it might be worth just replacing it.
Best Regards

#3 Capn Easy

Capn Easy

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Posted 21 July 2010 - 05:56 PM

I do a lot of audio with my computers -- no guitar pedals, though. Still, the description sounds a lot like a ground loop. Try Googling that, along with "hum eliminator," and see if that makes sense.

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