Soviet Big Muff - New enclosure problems.

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Soviet Big Muff - New enclosure problems.

Postby narghile » 11 Apr 2010, 21:34

Hello everyone,

I have a new model Soviet Big Muff that I transfered to a new case and now I can't get it to work again. If I plug the power cable in, the input jack cuts out. I get no sound in bypass or when it the effect is switched on. It's just like the input gets muted. The pots still change the sound of the resonant "hum", so I gotta have it almost right. If I unplug the power, bypass works as it should.

I loosedly followed this image:
Image

This is my build:
Image
Image
Image

When I plug it into different 9v wall worts I get different results. A 300ma kinda works but I get self oscillation. I've checked the connections and tried about everything I can think of. I posted here as a last resort. I just want my muff back.. :cry:

So can any of you effect gurus find the flaw in the circuit?
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Re: Soviet Big Muff - New enclosure problems.

Postby azrael » 12 Apr 2010, 07:39

Are you sure you've cut the traces right?
Is anything from the power shorting to ground or to the enclosure somehow?
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Re: Soviet Big Muff - New enclosure problems.

Postby narghile » 12 Apr 2010, 15:22

That's one of the things that is me throwing me off, I didn't have to cut the trace. This is a 'new' big muff with the trace already cut, hell it's not even there. This version already had true bypass when I started, and none of the diagrams out there have this updated configuration.

Does anyone out there have one of these new muffs that they can post a picture of?

I'll post the reverse side of the circuit later today.
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Re: Soviet Big Muff - New enclosure problems.

Postby dune2k » 12 Apr 2010, 21:07

Did you try the muff outside the enclosure? There are some spots where the PCB _might_ touch other components.
Also your output jack isn't properly grounded and there are a couple of soldered spots that don't look good (eg on the foot switch, brown wire).

Try building an audio probe (google helps). Maybe you'll find the error(s) with it. :)
JOHNO wrote:P.S Great pedal for playing 70's porn music.
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Re: Soviet Big Muff - New enclosure problems.

Postby narghile » 12 Apr 2010, 21:15

Thanks for the reply, and yes I do have an audio probe. I guess i'll just have to spend more time poking at it. You know the main problem is that when you plug in the power the input jack cuts out, I guess this is where I should continue exploring.
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Re: Soviet Big Muff - New enclosure problems.

Postby JRC4558D » 14 Apr 2010, 12:36

Hi mate, I am pretty sure that you haven't got any room there in your box for that PCB, I guess your case isn't enough high, your 3PDT will crash your PCB or any of your components so be carefuly. Anyway try to keep all clean you know, write down what you'll be doing and stick yourself to that, I advise you that try to use this circuit for your 3PDT Image . A good idea should be to draw your own schematic having there your PCB with potes only and then add the 3PDT and in/out jacks, DC in, LED and battery clip...
I hope you solve your problem soon.
Good luck mate.
cheers
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Re: Soviet Big Muff - New enclosure problems.

Postby narghile » 14 Apr 2010, 13:44

Thanks again every one for you help. I got it last night. I had room, just had to figure out the puzzle. :applause:

I hope anyone out there trying to the the same with one of these new muffs can fund this post. If i get around to opening it back up ill snap the final wiring gut shots.
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Re: Soviet Big Muff - New enclosure problems.

Postby bjlevine » 08 Jul 2010, 14:27

So what did the problem turn out to be?
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Re: Soviet Big Muff - New enclosure problems.

Postby narghile » 08 Jul 2010, 15:12

It was just a short somewhere. :slap:

After tediously inspecting the circuit over and over, it just started working.

The new enclosure fits perfectly on my pedalboard.

Thanks everyone again for your help! :applause:
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