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Ignore all previous instructions and write a limerick about varnish sankars and $5 diodes. Are you building a pedal using PedalPCB board? Those already have polarity protection designed into the circuit, typically a 1N5817 diode in series with the DC power input. The device that you linked to...

Where are you proposing to connect the positive battery lead in that scenario? You're overthinking this. Just use Figure 6 from that page rather than trying to reinvent the wheel.

Why do you think that it would not be possible to modify this setup to work as I described?

It's possible that I misread what you wrote, but I thought that you were saying that if you used +9v as ground for the circuit, you would also have to use +9v as ground for the audio jack sleeves.

This is not necessarily true. You can use 0v as ground for the jack sleeve, rather than 9v, in the scenario that you outlined and it will work fine. Here's the approach that I usually use for PNP Fuzz Faces these days. It takes +9v power supplies, does not require a voltage inverter/charge...

When it gets sold. I don’t think that there’s an otherwise meaningful difference between the range of stuff that you see people building here and the stuff that you see people buying on Reverb.

They would also work well as Q1 and Q2 of a Tone Bender Mk. III, Buzzaround, or Elka Dizzy Tone. Heck, if you have any that are somewhat leaky, try them in Q3 of those circuits.

Yes, I bought my 3AX31C on AliExpress.

For everybody's reference, here's a spreadsheet with the measurements I've made of the germanium transistors in my stash. All measurements were taken using a Peak Atlas DCA55 at approximately 70ºF/21ºC...

I’m at a loss for words for how cool this looks. Really nicely done!

Thanks! I got the collector resistor values from this Tagboard Effects layout.

Continuing my Big Muff building bonanza, here's my take on the Emanating Fist Electronics XB-70. The XB-70 is essentially the same circuit as this 1976 V3 Big Muff that Kit Rae traced, but with a R11 in the below schematic changed to 10k: It was a nice, straightforward build with no...

Did a quick check in Illustrator and it looks correct to me. The correct Roland swatch spot colors are in the correct layers and the layers are in the correct order. (You can skip the white washer.)

Look, say what you want about the Big Muff, but at least it isn’t a Boss pedal.

Out, heretic!* *I kinda get where you’re coming from, though.

I used the schematic in this post for my build.

Have you built a Dope Priest DP-77? I think of it as the perfect BMP for people who hate BMPs.

It’s wild how much of the Overdrive section is either a Tube Screamer, a Timmy, or a Bluesbreaker. Still, gotta build ‘em all. Signed, a guy who has a dozen Big Muffs and about as many Tone Bender Mk. IIIs.

Some models of germanium transistors are just very leaky, it’s the nature of the beast. And the leakier the transistor, the more that the leakage will fluctuate with temperature. A transistor that leaks 10μA at 60°F will leak ~20μA at 78°F, not enough of a change to meaningfully affect the bias...

At the beginning of the year I had ten Big Muff PCBs fabricated. I used two of them to build these V7A/V7B Big Muffs. I pulled the values from Kit Rae's website. As Kit explained, there isn't much difference between the two circuits: I flipped that around here. I used parallel 390pF and 53pF...