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Cool, sounds like a fun circuit. Now you got me rabbit holing after a diode laser.   

Necro-bump!

When I was building mine, I did not find any of the diagrams clear enough, so I made one of my own. I'm sharing it here in case someone else finds this thread in the future.

One other option is to use a 4PDT switch and fully switch out all three lugs of each pot, while still utilizing the bicolour LED. Just throwing the idea into the ring.

Jacob

This is what I was going to recommend.

Agree with what everyone has said about the Scarab. It's a spectacular pedal. I'm not wild about fuzz, but this one is so versatile and sounds so great. Nicely done!

Agreed: the back of that board is gorgeous. What a fun unexpected bonus.

FWIW, switching to Helix is what convinced me buy a new tube amp. Being able to experiment with tons of different sounds led me to absolutely love Vox tones. So I bought an AC15, which I never would have considered before! That said, I'd guess that on the whole, the explosion of modeling has not been kind to the amplifier industry.

A sad occurrence in any case. 

Love the video, and it definitely sold me on buying the project. I think maybe you forgot to change the patch number after 3 on the video headings. NBD, just the kind of thing that I would want to know if it were me!

I'm looking forward to building the EJ Fuzz Face too, even though I need more dirt pedals like I need a hole in my head. It'll make a nice gift.

Congrats on the release and thanks for keeping the scene fresh in These Unprecedented Times™.

A true legend. Even though it's not really my cup of tea, there's no denying his influence on the instrument, and on rock. Gone too soon. I'll kick on a Phase 90 in his honor tonight.

I am using the older version of the board as found here. I have two questions about this build.

1. Why is the 14th capacitor labeled C101? Does it correspond to R101, one of the optional pulldown resistors?

2. Where can I source 220pF MLCC caps for C1 and C5? Small Bear doesn't seem to have them in values that low.

Wow, that's a whole lot of cool sounds in one box. I'm not sure I'd use most of them in any serious way, but what a lot of fun!

Yep. She turned 6 last week. Honestly, it's felt like 8 years already, haha. But it's speeding up, for sure.

Becoming a parent made time speed up for me for sure. My older one is 16 now.    No telling what this lost year (God, please let it just be one year) will do to our sense of time's progression.

Not sure this is helpful, but a friend and I have been working on a fuzz for him lately, and what he's found is that the TB mk1.5 is basically just a Fuzz Face with a few passive component value changes. So I'm guessing Fuzz Face transistor gain would work with the Mk I. But I'm here to learn, and I bet someone with more knowledge will have something more helpful!

Great looking build! I like those flat bat toggle switches. Where'd you get them?

These builds look amazing! Not to take anything away from them, but I would love to hear more about your AC4 build. Have you posted about it before?

For a Univibe mod you want to have the phase stages at a 10:1 ratio. So, C2 and C3 need to be 10:1. Or 1:10. It doesn't matter which order it's in. When I put those extra pads in I was blazing through the design and didn't realize until later I put them on the wrong caps!

The easiest way to achieve the mod on the Smoothie is to switch out C2 for a 4n7. Or, you could toggle b/w 4n7 and 47n using a mini SPDT switch.

Ah, so when the two caps are the same value, the effect acts like a phaser, and when they're 10:1, the effect acts like the vibe—so toggling one of them between equal and 10x (or .1x) is the way to have access to both sounds. I think that makes sense.

Wouldn't I need a DPDT, though? One cap on each end, with the common row wired to the PCB? BTW, I'm putting this in a multi-effect box, so space is not a concern.