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So my voltages suggest a bad IC?

Your voltages suggest something is wrong on the pins that aren't close to the voltages I mentioned. Bad parts are one of the last things you should suspect. Wrong component, wrong value, bad soldering, something wrong with the power supply, part put in backwards ...

That's neat. How do they compare in brightness? In the real world, not on a datasheet.

Some tips:

-There is a tutorial on DIYSB for this.

-The LED MUST be diffuse. It simply won't work any other way.

-Drill the hole exactly the right size for the LED. You want as much physical contact between the LED and the lightplate.

-Be prepared to have no idea if your pedal is on or off based on the LED, because unless you play in a really dark room all the time, you probably aren't going to see it.

Jon, I don't have an answer to your question but I do have a question for you about the Sharkfin.

Is your sample and hold section volume quite a bit lower than your bypass? If so, did you, or do you know of anything that will fix this?

I know Cortexturizer did a clean/mix mod but I would rather just have the section louder.

The total effect is a little tiny bit above unity when the envelope is open, and naturally is going to sound a little quieter when the envelope is closed (no treble). The sample and hold is essentially a square wave flipping back and forth between the envelope's open state and closed state. It's going to sound quieter for the same reason a tremolo might sound quieter.

I tried to decipher the datasheet in regard to what the voltages should be.  Do these look ok?

You should have -9V on the V- pin, and +9V on the V+ pin. Everything else on a quad op amp should be halfway between that.

I've got some hum appearing at pin 2 of IC3. It gets quieter when the envelope is "open," and gradually comes back in as the envelope settles; it's also a little louder as the

It's perhaps 1/3 as loud as the guitar signal, so ... kind of obnoxious. I'm not sure if it's just the CA3080s or what; I expect them to be noisy.

It also gets quieter when I move my input guitar cable or reposition the pedal. That's weird. :/

The circuit works just as it should otherwise.

Anyone think a daughter board for a 13700 conversion would be quieter?

Actually, don't you have the extra enclosure from that?

I somehow got the impression there was a third floating around ...

Bean, is that really the box for the fuzz, or is the proto just in Pickdropper's leftover Companion enclosure? Because that knob is mighty close to being stompable.

Also, would reducing the two 4k7 resistors make this thing vibe faster?

To a point, yes, assuming it doesn't lock up and stop working altogether.

Huh, Pickdropper's a Paladin. And here I was sure he was a wizard.

H11F1 through-hole chips before they are impossible to get any more.

Is this a thing?!? I only recently discovered how cool they are : /

I think they're already marked obsolete. Plenty in SMD, though.

Thanks, folks.

I'd grab a 100 or so through-hole transistors or FETs.  Stock up while they are still in production.  At the cost savings of those quantities, you could always flog them off at a minor profit later if you didn't need them.

Are there ANY through-hole FETs or MOSFETs left at Mouser?

BS170 and 2N7000 are both still in production....... for now.

Grabbing 100 of each would be about $20.

Considering how many BS170s I blow through in my recent designs, I guess I'd better do that with my next order. I'd been getting them piecemeal at Smallbear.

Maybe a groupbuy is in order. They're 8c each in quantities of 1000.

I'd grab a 100 or so through-hole transistors or FETs.  Stock up while they are still in production.  At the cost savings of those quantities, you could always flog them off at a minor profit later if you didn't need them.

Are there ANY through-hole FETs or MOSFETs left at Mouser?

Anyway:
LT1054, though you probably have plenty of these

TLE2072CP -- to replace all your 072s (seriously, the noise is noticeably better)

These nifty Murata power converters:
http://www.mouser.com/ProductDetail/Murata/NMA0515SC/?qs=%2fha2pyFaduhFiAPVWrTrFQM2YxeR6Wl2ZuHmK8xFWK4%3d

H11F1 through-hole chips before they are impossible to get any more.

Could be dozens of things. .27V is an extremely common range for germanium diodes.

Probably not a 1N34A. Those are higher, above .3v.