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Pedal whine
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vvv
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Joined: 13 May 2003
Posts: 7954
Location: Chi

PostPosted: Wed Nov 02, 2016 7:23 pm    Post subject: Re: Pedal whine Reply with quote

I just messaged the manufracturer:
=========================
I have a single-digit serial # Meat pedal, and a 400's # Meat, Jr.

Both work fine with batteries, but using a 1-Spot or Mr. Power, even if they are the only pedal, results in whine-like noises. Is that because the power-supplies are not isolated? Is there a mod I can do to use these pedals on my board without having to use batteries?
=========================

If any of all y'all have an idear, lemme know, please.
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vvv
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PostPosted: Wed Nov 02, 2016 7:24 pm    Post subject: Re: Pedal whine Reply with quote

FWIW, I use the Toadworks Mr. Squishy compressor on my bass board, with a 1-Spot, no issues.
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vvv
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PostPosted: Wed Nov 02, 2016 7:52 pm    Post subject: Re: Pedal whine Reply with quote

Back to the manufracturer website linked above it says, "Recommended AC Adaptor Visual Sound 1-Spot". Evil or Very Mad
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Drone
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PostPosted: Wed Nov 02, 2016 9:41 pm    Post subject: Re: Pedal whine Reply with quote

Well better regulated supplies, maybe tweaking the value of that big grey cap, if it's on the power line. I think there's like a chargeable 9v supply you can get, that would give you clean DC for a gig.

Simplest and best DIY would be build a nice regulated 9V supply, going by the size I imagine the 1-Spot must be a switch mode, I have an older Boss supply that is regulated well, look for something like that?
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vvv
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Joined: 13 May 2003
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Location: Chi

PostPosted: Thu Nov 03, 2016 1:16 pm    Post subject: Re: Pedal whine Reply with quote

Toadworks responded:
===============================

Hi Mick

The short answer is yes, there is a simple mod - and yes, it's because the
op-amps in the signal path are not decoupled from the power supply... when I
designed them, it wasn't a problem... but some of the newer digital power
supplies generate ALOT of noise, so this has become necessary on all new
designs.

Easy mod: both pedals should have a red, white, and black wire connecting
the 2.1mm DC jack to the PCB. Replace the WHITE wire with a 25 ohm resistor.
That should fix the problem.

Feel free to contact me if you have any other questions.

-Ryan

===============================

Cool
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PostPosted: Mon Nov 07, 2016 10:26 am    Post subject: Re: Pedal whine Reply with quote

Gru-v. Did it work?
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vvv
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PostPosted: Tue Nov 08, 2016 7:36 am    Post subject: Re: Pedal whine Reply with quote

I ordered the resistors, still awaiting receipt.

I will report back.
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Scodiddly
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PostPosted: Sun Nov 13, 2016 2:44 pm    Post subject: Re: Pedal whine Reply with quote

Wouldn't be a big deal to make an inline power filter for those PSU's. Electrolytic cap on each end, either a choke or just a small resistor between.
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vvv
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PostPosted: Sun Nov 13, 2016 10:48 pm    Post subject: Re: Pedal whine Reply with quote

Scodiddly wrote:
... a small resistor between.


Yeah, I think that's what the guy said?
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vvv
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PostPosted: Wed Nov 30, 2016 4:21 pm    Post subject: Re: Pedal whine Reply with quote

Installed and working! Cool
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PostPosted: Wed Nov 30, 2016 8:18 pm    Post subject: Re: Pedal whine Reply with quote


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vvv
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PostPosted: Thu Dec 01, 2016 4:06 pm    Post subject: Re: Pedal whine Reply with quote

Actually something to keep in mind if ever such a problem is again encountered.
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