Building Shika fuzz on a generalist Muff Board

[dicecard]

As in the title - would it be possible to build the Shika fuzz on a multi-purpose Muff board like the PPCB muffin or the GuitarPCB one? If so are there any revisions that'd need to be made?

I'm asking because I was intending to build one, but Musikding just sold out that kit/PCB today and who knows how long ut could take them to restock it.

 

[Robert]

Yep, it's a straightforward 'Muff circuit.

You'd just need to translate the component values for the Shika to the Muffin BOM.

 

[dicecard]

Yep, it's a straightforward 'Muff circuit.

You'd just need to translate the component values for the Shika to the Muffin BOM.

I'm asking because from what I'm seeing, the Hizumitas circuit isn't 1:1 identical to the stock muff circuit, it has a different part count so I'd need some advice in what exactly I need to sub with what, I'll create a draft BOM when I get home and post it here for approval, k?

 

[Robert]

Here you go.

 

[dicecard]

Thanks! I compared your BOM to the original and I see that 4 1N4148 diodes, 1 1N5817 diode, R100 (100R) and C1 (100p, leading to ground right after the input) are missing, the clipping diodes bc I'm guessing they're all the same in the circuits, but what about the other parts?

Also I've noticed that the muffin PCB isn't available on Musikding either, so I'll have to use the GuitarPCB MUFF'n which looks the same, but also lacks the 100R capacitor near the input.

 

[cdwillis]

You can use a 100 ohm resistor instead of a wire to connect your power jack to the 9v input on the board. It's not going to have a noticeable effect if you leave that out. On the muffin board just solder your 100pf cap on top of r23 if you want to keep that cap on the input. You can even just remove r23 and replace it with the 100pf cap. If you use the standard pedalpcb wiring for your 3pdt the input cap is grounded in bypass and you shouldn't have to worry about popping when switching it on.

 

[Feral Feline]

Hey, just came across this thread — Wasn't the EQD ELK's TONE reverse wired, like the Creamy Dreamer?

I see in my build docs, though, that the square pad for both the Shika and Muffin Man are the same location.
The SHIKA schematic though still shows the reverse order of the Tone pot... Same pad location, different trace wiring?
This may or may not be important to @dicecard building a SHIKA on a Muffin Man board, but for sure it's important to me.

I wanted to use the SHIKA board to build a hybrid of sorts with the Creamy Dreamer's reversed TONE-pot wiring.
If the SHIKA board isn't reverse wired, I'll have to swap the HP & LP R/C combos on the board...

@Robert?

 

[Hal Harvey]

I can confirm the Shika tone control is reversed. I built a Champion Fuzz Unit on one and it surprised me when I first fired it up. Brighter counter clock-wise.

 

[Robert]

I see in my build docs, though, that the square pad for both the Shika and Muffin Man are the same location.
The SHIKA schematic though still shows the reverse order of the Tone pot... Same pad location, different trace wiring?
@Robert?

Yep, it's reversed. (Electrically, not physically)

 

[Feral Feline]

That's what I thought, thank you for confirming it Good Sir.