Re: Muffinator

[k3yPr0gg3r]

Hi,

Is there going to be a BOM for the Muffinator soon?

Thank you...

 

[Chuck D. Bones]

Allow me to answer in Haiku

Pedal PCB
Roulette, buying a board but
Build Docs coming soon...

 

[Chuck D. Bones]

But seriously folks...
The description states: The Muffinator Fuzz is identical to the PedalPCB Muffin Fuzz, with the addition of switchable diodes in each clipping stage.
In other words, 95% of the BOM can be found in the Muffin Fuzz build docs.
The two toggle switches can be either ON/ON for selecting one diode pair or the other, or ON/OFF/ON gives a 3rd choice: no clipping diodes. I recommend ON/OFF/ON for the switch on the right (when viewed from the front panel).
The diode footprints imply that D5-D8 are intended to be Germanium diodes. Warning: 99% of the Germanium diodes you'll find for sale are too leaky to be useful in a BMP. Whatever you buy, you'll have to test them. Don't bother with Russian Germanium diodes, they are all too leaky. A good alternative is low-leakage Schottky diodes. IMO, you would be better off using red LEDs for D5-D8.

 

[Locrian99]

Red leds are fantastic in a muff. 4148’s compress and give so much “hair” do you really need more that a germ or work alike would. Red led’s with the off option as chuck suggests are perfect for a 2nd option to me.

 

[Ginsly]

Warning: 99% of the Germanium diodes you'll find for sale are too leaky to be useful in a BMP.

For whenever I get around to building a Big Muff - what would you consider “acceptable diode leakage” for situations in which that matters?

Other than the BM, what other circuits are sensitive to high Ge/Sch diode leakage?

 

[Chuck D. Bones]

For whenever I get around to building a Big Muff - what would you consider “acceptable diode leakage” for situations in which that matters?

https://forum.pedalpcb.com/threads/whats-all-this-stuff-about-germanium-diode-leakage.7185/

Other than the BM, what other circuits are sensitive to high Ge/Sch diode leakage?

Anything that uses the diodes in a feedback loop.

 

[darwin999]

The description states: The Muffinator Fuzz is identical to the PedalPCB Muffin Fuzz, with the addition of switchable diodes in each clipping stage.

And the part #s in the Muffin Fuzz carry over to the Muffinator as well (except for the additional diodes which Chuck already mentioned).
Also, check out this post by @Robert for the switch orientations:

Post in thread 'Missing Build Docs / Schematics'

Mar 22, 2024

EDIT: What he said.


The BOM is identical to the standard Muffin with the exception of the two added toggle switches and extra diode pairs.

D3/D4 (UP) and D5/D6 (DOWN) are the clipping diodes for the first clipping stage

D1/D2 (UP) and D7/D8 (DOWN) are the clipping diodes for the second clipping stage.

The two toggle switches are SPDT ON/OFF/ON, unless you don't want a "no clipping" option in the center position. In that case, ON/ON.

• Robert

• 
• 

 

[Ginsly]

https://forum.pedalpcb.com/threads/whats-all-this-stuff-about-germanium-diode-leakage.7185/



Anything that uses the diodes in a feedback loop.

Yikes, under 50nA, huh? I used your technique to measure a few a while back, and none of em came close to that...