[1096] The Multi-Fuzz (mini-muff version)

Date: November 7th, 2011 | Comments : [14] | Categories: DIY.

Mini-Muff schematic

The Big Muff may be a classic distortion design, but it is often too much of a good thing. The cascaded gain stages with the dual diode clipping will remove most of the dynamic range from the sound. This article is about trimming down the basic design to give back some of the dynamics, enhance transparency and make the pedal a more useful and versatile distortion/overdrive.

When I was designing the pcb for the Multi-Fuzz, which uses mosfet, germanium and silicon transistors, it occurred to me that I could build a simplified Big Muff on the same pcb, if I made a few additions to it. Since this has always been a project that I wanted to try, I made those changes and the mini-muff version was born.

It turned out to be a great project with some nice low gain overdrive sounds. It is perfect for adding just a bit of crunch to fatten up a guitar tone. The full schematic is available online for you to build on perfboard or stripboard, but you can order the Mini-Muff pcb to make construction easier.

Get the full schematic and parts list for this transistor overdrive.

Mini-Muff pedalHere is the prototype of the mini-muff pedal that I installed in an pedalbox that I recycled from an old project, which is why it has the Cheesetone decal on it.

I usually power this pedal with my standard AC power supply sent through a V-Doubler converter which provides a stable positive ground 9v supply needed for this circuit. (see image below)

I have also powered it with my rechargeable battery pack through the V-Doubler, and that works just as well.

Mini-Muff pedal


14 Responses to “The Multi-Fuzz (mini-muff version)”

[2406] Niko Says: 11:01 am, November 7th, 2011

Could this pcb also be used to build the FET Muff being one of your older projects?

The FET Muff has an audio mp3 on the AMZ main site which i dig verrrry much.

[2407] leadingzero Says: 2:44 pm, November 7th, 2011

I love this site!!!!Keep up the inspiration!!!

[2408] Ihunda Says: 4:11 pm, November 7th, 2011

If there’s no mp3 it didn’t happen!

[2409] admin Says: 4:18 pm, November 7th, 2011

Q: Could this pcb also be used to build the FET Muff?

A: The Fet Muff has 4 gain stages and there are only 3 available on this pcb.


[2419] Gary Says: 2:45 pm, November 12th, 2011

What do you use to do your graphics on your pedals?

[2422] admin Says: 1:29 pm, November 13th, 2011

The graphics are clear decals. I print in reverse with a laser printer then transfer to the painted pedal. When thoroughly dry, I spray over the whole pedal with a clearcoat.


[2424] Gary Says: 7:20 pm, November 13th, 2011

I should have asked. What kind of software do you use for your graphics on your pedals?

[2430] admin Says: 6:41 am, November 15th, 2011

I’m using Paint Shop Pro, only because I have used it for years and am comfortable with it. I have an old version of Photoshop but don’t use it for graphics.

[2432] rugeb Says: 11:34 am, November 15th, 2011

Hi Jack,
You can add a sustain stage?
You have a sustain schematic?
The sustain it could do with 2 stage boost muff?

It’s interesting a sustain without distortion…,next project?

[2511] Joe Says: 10:51 am, December 18th, 2011

Should not 47uF (c14 or c16 depending on version) be reversed, so that the negative side goes to -9v?

[2512] admin Says: 1:09 pm, December 18th, 2011

Joe, you are correct. C14 should have the negative side to the power supply input. Thanks for pointing it out!

I have corrected all of the schematics.

Best regards, Jack

[2513] Joe Says: 1:20 pm, December 18th, 2011

OK, then I’m not completley lost 🙂 Think I will try this one out. Thanks for great site!

Best regards, J

[2653] Michael Says: 8:59 pm, February 18th, 2012

Hey I recently did this pedal but when I plug it in my guitar signal goes through but only clean and it has this buzzing sound to it, I press the switch and the fuzz won’t engage, what did I do wrong?

[2665] Ben N Says: 8:30 am, February 26th, 2012

One could just build a “standard” BMP with a bypass on one of the stages, no? Then you get both OD and classic BMP in one pedal.


AMZ Home Page

Guitar FX PCBs