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In case someone needs an image of the modification:

I've only had one PCB guitar mania board that I couldn't get working: The Flaming Ring, which is a DBA Flaming Lips Space Ring. The quality of the boards are definitely suspect and a few just sound nothing like what they're supposed to be a clone of. The build docs are ok-ish but the PCB layout...

I still remember my first audio circuits class after spending the previous year having to do a ton of complicated math to have the professor literally just say "none of those resistors matter, so just drop them and then just simplify this complicated looking section to another resistor, now the...

You want to test voltage at the collectors and not the emitter. Here's an article on electrosmash discussing the fuzz face biasing: https://www.electrosmash.com/fuzz-face

I had some issues with this pedal myself. It helps to understand what the circuit is actually doing. There are four sections: boost, octave up, fuzz, and volume. The boost section (controlled by the sustain pot) will amplify your signal before sending it to an octave up (diodes + lm386) based...

Yeah, your report sounds like my experience, I thought I had the new revision given when I bought it. Just goes back to the old saying about assuming... I've still got a parentheses fuzz I need to box up so I can make a good comparison video. :)

Love the pedal design. It reminded me of the game Aviary Attorney.

The O1 and O2 pads on the effect board are reversed so you need to wire O1e -> O2fs and O2e -> O2fs

After some screw ups on my part with the EV Mini, it worked marvelously. (Note to self: just because you sorted resistors correctly doesn't mean you still can't screw it up, so always double check their values before soldering). You can find some gut shots here. Then I got around to building...

Just an idea, but have you attempted to simulate what you want to do manually? For instance remove the ATtiny from the equation completely and have 5v running to two on/off spst one for each relay. That way you can determine if it's the circuit or your code.

Guilty as changed. I ended up bookmarking a page with the codes so I'll have a reference going forward.

I've got an ultrasonic cleaner but use it to clean clock parts; what cleaning solution do you put it in to clean the flux?

No worries, that was the problem, guess I threw some resistors in the wrong pile and didn't pay attention. 😦

The gain and bias trimmers both affect the brightness of the bulb. I'll definitely focus on going backwards from that capacitor to the reference voltages.

Full on with no LFO action.

I changed r14/15 to 4k7 but still no luck. My assumption is that C8 is the capacitor between the two 4k7 resistors in the top right of the board below the c100k pot.

The top board works with no issues. It's the LFO that doesn't start. I can always desolder the 2.2uF and 1.5k resistors and switch to the 1u and 4k7 resistors but I would like to have a little more depth at slow speeds.

I am currently wrapping up an ElectrVibe Mini build and ran into the problem with the LFO not starting up. I can manually cause the bulb to increase in intensity via the gain and bias knobs and hear a change in the tone (as you'd expect in a Vibe), so I know the rest of the circuit works. It is...

Thanks! Everyone has to got to live with my ability to basically play the same few chords over and over again.. maybe next time it'll be Rock You Like a Hurricane. :)

A really great build. I built two of them. One for me and one for a friend. I didn't deviate from @PedalBuilder 's design because I thought it was really awesome -- all I did was tweak the colors and gains on Q1, 2, and 3. They are both using the highest gain GT310b transistors that I had, so in...