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Solved!

2..3.... years on the shelf?  Came back to it, checked every available schematic on the www,cursory look at ceramic cap  C6 notice it says 104, its meant to be 150pf, which is like 151? Soo 100000pf instead of 150pf.. Tested it 98.7nf...Checked my bag and its a TAYDA mis-labelling!

Twisted a 100 with a 47, tested at ~146pf, wacked it in and sweet!

Then removed the 100k r15 to ground at the end, slight increase.

So now going back through all my old builds to recheck any 150pf's, britannia, kraken.....

1 bag out of like 200 bags is a pretty good ratio of success I guess, I still rate TAYDA.

Also while trawling through ic muff schems i noticed a few, including analog guru's schematic, had a 4.7uf for C5 instead of beans 1uf,... Reminds me of the fat fuzz factory  switch position, if ya catch my drift

Time to box!

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Audio probing was interesting, good idea wormy, I've never used one before although I made one ages ago. Sound was sounding great and crunchy through the first IC, through the sus pot up until about r9, then a duller less trebly and slightly quieter distortion till the end. Interestingly one side of the diode cluster was getting no audio, similarly one side of c6. Could this be it?

All the 914's were measuring ~600(mv?) each anisotropicly.

Cheers again.

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Checked all resistors,  using DMM unless it was weird then colour chart and an app. All checked out good, checked cap values, all good.  Sustain pot all good.  1n914 all orientated.

I've seen some schematics with 0.68uf for C1? Although I'm guessing that's more a frequency thing as opposed to volume?



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Haven't built one myself, but no more than unity volume and fuzz with one guitar but no so much another (for a pedal described as a "wall of fuzz") ... sounds like you have a problem. The 8.87V on the supply is not the problem, and neither is the output resistor (which seems superfluous anyway).

I would start by checking the values of the resistors by trying with the DMM (which might not work well in the assembled circuit) or reading the color bands (which works if you have good colour vision, which I haven't). I would start with the ones that modify the gain most in the circuit: R2, R3, R6, R7, R9, R10. If they are correct, I would check their soldering, as well as the soldering of C4 and the SUS pot (as well as its value).

Cheers, I'll check them out..

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Coming back to my pig butt after a year on the shelf I've hooked it up and, yeah, it's fuzzing {with one guitar and not so much with another,} it's just quiet, as in unity at full volume. Is this normal and can it be fixed?
Of note, I read the voltages and photo attached. Because I'm filtering my el cheapo power supply its starting off at 8.87v. Pertinent?
The tone off switch provides a slight boost at the cost of, well, tone.
I've attached a gut shot, not the cleanest build, especially after pulling the volume to recheck its ohms.

Maybe pulling the final drop down resistor?

Any feedback welcomed.

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Theremin!! heck yeah! I'm in!

the 2015 build doc suggests that C14 is "optional" and is used to smooth out the led clipping highs... might be worth removing, strewth I might try that myself... treble is good .

do you mean 5mm instead of the 3mm red Leds in the circuit? When you bypass the footswitch and connect the kill switch wires is it all g?

Cheers for the reply, yeah i triple checked those, each one is reading about 600(?)on my multi on diode test, i might just try replacing them just in case... being that they are the clipping. I kind of expected a volume increase even without clipping? Gremlins

Hi, soooooooo I made a Pig butt, stock everything, 1N914's.. LM741/ 4558. rocked it prior to you know what .

It does not seem to be clipping,
Sustain knob at 0 lets no signal through, (normal?)
the output with everything at full seems to be about unity.

IC voltages all good..

Made up an audio probe/ test rig ( wished I done that years ago) . Its my 1st time with a probe, a bit hit and miss.
Following the schem I guessed i should be getting signal at the input/pin 2 of LM471 ? don't seem to be, only on pin 6 , only on the output, weird. also i'll get noise in between the diodes but not at each end. I'm getting a bit confused about what should be making noise and what should not..

I've replaced both IC's with different sourced parts.

I've spent hours trawling the net in vain hoping that someone else has had this issue...

I've been pretty lucky in past builds i guess, oh and i used lead free solder for about half the board till i got frustrated with the mass of smoke and slow melt , back to holding my breath in a cloud of lead...

Any hints appreciated.