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 Post subject: Noise Issue with ISO 5
PostPosted: Tue Oct 31, 2017 8:35 pm 
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Joined: Tue Oct 31, 2017 8:24 pm
Posts: 3
My pedalboard patch cables are carefully built and everything is sounding clean with batteries.

When I connected my Voodoo Lab Pedal Power ISO-5 I heard a super nasty hum. If I move the ISO-5 far away from the pedals (can only go so far with all those short DC cables) the noise goes away. It's got to be about 8" away from ANY of the pedals to fully remove the noise. But my board, like many, is totally cram-packed and I don't wanna use a huge pedalboard just to add space between the ISO-5 and the nearest pedal.

I'm pretty sure the noise isn't ground loop (obviously they are isolated outputs) but EMI coming off the transformer inside the pedal power. It gets worse when I bring the Pedal Power near to the pedals, so...Kind of a bummer since the whole reason I got it was to keep things quiet. Even if I'm using a different power supply for the pedals, bringing the ISO-5 physically close to any of the pedals produces a hum (as long as the ISO 5 is connected to the 120v power)

So next I tried a 10-spot daisy chain (Pig Hog brand, nice thick cables) and chained all the pedals together with the daisy chain cable. I then tried connecting it to 2 different cheap power adaptors with sufficient current. HUGE buzz with both adaptors, more of a ground hum type sound. No surprise there.

So next I tried connecting the daisy chain to the 400ma output on the ISO-5, keeping it far away from the pedals (all pedals daisy chained together and connected to ONE output on the ISO-5). This actually seemed QUIETER than using the isolated outputs for each separate pedal. Probably because I was able to keep the ISO-5far far away from the pedalboard. This tells me I probably don't have to worry about ground loop noise if the power supply is clean and far away from any pedal.

The ISO 5 was certainly the cleanest/quietest AS LONG AS I kept it 8 or 10 inches away from any of the pedals...but I'd really like to have it mounted to my board.

I figured it was just EMI coming off the transformer inside the ISO 5. But nobody else seems to be complaining about this, and after I posted about this issue on another gear forum, somebody suggested this isn't normal and I should contact VooDooLab.

Thanks


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 Post subject: Re: Noise Issue with ISO 5
PostPosted: Wed Nov 01, 2017 10:52 am 
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Joined: Tue May 05, 2009 2:33 pm
Posts: 6760
Location: The Lab
We will gladly inspect your ISO-5. Feel free to give us a call or write to info@voodoolab.com to arrange for an RMA if you would like.

Have you tried powering just one pedal at a time to find if there is perhaps a main offender in the bunch? What pedals are you powering?


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 Post subject: Re: Noise Issue with ISO 5
PostPosted: Wed Nov 01, 2017 12:02 pm 
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Joined: Tue Oct 31, 2017 8:24 pm
Posts: 3
JohnClark wrote:
We will gladly inspect your ISO-5. Feel free to give us a call or write to info@voodoolab.com to arrange for an RMA if you would like.

Have you tried powering just one pedal at a time to find if there is perhaps a main offender in the bunch? What pedals are you powering?


Thanks for the reply.

Korg Pitchblack tuner--> EHX Octave Multiplexer--> MXR Phase 90--> HBE Power Screamer (overdrive)

When I power all 4 pedals on batteries and all pedals OFF (ISO-5 not even connected to pedal, just powered by AC cord), I can bring the ISO-5 close to the tuner, octave or phase 90 and I get a loud hum. I get a minor hum bringing the ISO-5 close to the overdrive pedal. When I turn on the overdrive, and bring the ISO-5 near it, it now too produced the loud hum. Again this is with the ISO-5 not even connected to any of the pedals.

The hum is worse when I face the bottom of the ISO-5 toward the pedals, the sides and top aren't as bad but still present.

I'll contact support through the email provided, thanks!


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 Post subject: Re: Noise Issue with ISO 5
PostPosted: Wed Nov 15, 2017 12:08 am 
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Joined: Tue Oct 31, 2017 8:24 pm
Posts: 3
I just wanted to follow up and say that I sent in the ISO-5 and I really really appreciate the customer service. Fast, prompt with clear instructions for the shipping. I hope I haven't wasted Voodoo Lab's time though, as I just bought a brand new Pedal Power Plus from Sam Ash (adding more pedals over the next couple weeks), and it's doing the exact same thing. Different guitar, different arrangement of pedals (some the same), different cables, and different amp. but it's doing the exact same thing. I'll just work around it and build a larger board to set the power supply several inches form the pedals.

I'd like to pay for the return shipping on the ISO-5 as it's probably not broken. I guess it's just the "nature of the beast" with transformers. If I put it about 5" or 6" away it's fine. Can't have it right next to the pedals.

I see on pedalsnake.com it says:

"Any power supply will emit a certain amount of electromagnetic interference (EMI). When placed to close to an effects pedal, you can hear the effects."

when moving the unit close to the pedals, Power Screamer is the worst, Phase 90 second worse, BOSS CS-3 has moderate noise, CE-2 (running at 12v) has barely noticeable noise, Korg tuner has no noise.

Power is super clean and quiet once I move the unit away from the pedals. I'm not dissatisfied with the products, just sorry I wasted somebody's time. I plan to keep the Pedal Power Plus, this is NOT a complaint!


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