Fuzzy Fox Loud static when engaged [Moved from The Toolbox]

Ctrl4Smilerz

Ctrl4Smilerz

Well-known member
Hi all. I got this Fuzzy Fox built but all I'm getting is a loud static when engaged. I tried reflowing so joints, but so far it didn't help. I usually start by measuring voltages on the ICs but not sure how to go about debugging this one. I already tried cleaning the flux with ISO and a toothbrush but plan to give it another go. The transistors were purchased directly from the PedalPCB website. I have tried boxing it up to no help. The noise is like a loud persistent SHHHH. I would welcome any guidance on how debug this.

TIA
 

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Ctrl4Smilerz said:
Hi all. I got this Fuzzy Fox built but all I'm getting is a loud static when engaged. I tried reflowing so joints, but so far it didn't help. I usually start by measuring voltages on the ICs but not sure how to go about debugging this one. I already tried cleaning the flux with ISO and a toothbrush but plan to give it another go. The transistors were purchased directly from the PedalPCB website. I have tried boxing it up to no help. The noise is like a loud persistent SHHHH. I would welcome any guidance on how debug this.

TIA
Click to expand...
How's it looking after the reflow and clean? Do you have new pics?

I was looking it over for bridges, but it would be easier to tell if it was cleaner.

Have you confirmed the transistors are all turned the right way? That all the component values are right?
 
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Erik S said:
How's it looking after the reflow and clean? Do you have new pics?

I was looking it over for bridges, but it would be easier to tell if it was cleaner.

Have you confirmed the transistors are all turned the right way? That all the component values are right?
Click to expand...
After reflowing a few more joints and fixing one potential bridge I heard a noticeable improvement. I just did another pass with the ISO and am giving it some time to fully dry before testing it again. I think this is an inherently noisy circuit, so I don't expect it to be silent, but want to get it as good as possible. Thanks for your help, and I'll follow-up after I box and test it again.
 
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Ctrl4Smilerz said:
Don't have one yet, but am planning to get parts to build one with my next order.
Click to expand...
While totally not necessary i really like this for an audio probe


I use a little slide switch on mine with a philmore probe. Just got it out two nights ago, missed a joint on a capacitor in my build that wasn’t passing signal. Took me about 2 minutes to find the problem. Audio probing is almost always the right answering to troubleshoot
 
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I boxed it up and tested and it definitely sounds better there is still a persistent SHHH. I discovered that if I turn the drive all the way down it goes away, and I don't hear it until around 8 or 9 o'clock. Here are some updated pictures:

PXL_20260116_020435038.jpg PXL_20260116_020425702.jpg
 
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