Easyvibe pedal introduces ticking in other pedals through the power...

Started by Morocotopo, October 09, 2009, 11:58:27 AM

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Morocotopo

Hi, I recently finished my DIY pedalboard, it has one input for power and several outs to distribute it to all the pedals (I mean, all power connections are in parallell). LM317 regulated power supply. Big caps on it.
My Easyvibe "bleeds" ticking into the other pedals, even in bypass. When I use it with a battery, the ticking is gone, so the ticking doesn´t travel thorough the audio connections. How do I solve it? Any ideas?

thanks!
Morocotopo

R.G.

R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

Morocotopo

Morocotopo

R.G.

Quote from: Morocotopo on October 09, 2009, 12:03:25 PM
R.G, you mean putting bigger caps in the pedal?
Yes. A little series resistance (22R  to 100R) in the power line wouldn't hurt either.

Actually, you should be able to put a resistor in the ground line too. There should be **zero** ground current between pedals except for the signal flows, and that should NOT have supply current in it. But most boutique pedals deliberately pollute that by using the input jack ground wire to carry all the power supply for the whole pedal by using the ring contact on the input jack.

Just like center-negative power connectors and high impedance pickups, there's probably nothing we can do about that. So we have to paste over the holes in the pedals themselves.
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

Morocotopo

Morocotopo

kurtlives

Hmm I have this problem with my Neovibe. Can I put the series resistance before the filter caps?
My DIY site:
www.pdfelectronics.com

R.G.

Quote from: kurtlives on October 09, 2009, 12:38:05 PM
Hmm I have this problem with my Neovibe. Can I put the series resistance before the filter caps?
Sure. Maybe it will help.
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

Morocotopo

I thought of another idea: how about putting some filter caps directly into my pedalboard´s power connectors? Say, a pair of 4700 uF ones. So I would get extra smoothing for all the pedals... I know this is attacking the symptom and not the disease, but anyway...
I´ll try it later.
Morocotopo

Morocotopo

People, just so that you know, I put a 100R inline in the positive supply and the ticking is gone. Thanks R. G. and all, this might be useful for those who have the same problem. By the way, I put the EZ vibe before a dist/od pedal (BSIAB2 in this case). Classic Hendrix sounds! A bit hissy though, but that´s just the nature of the beast, I think.
Morocotopo