Mosfet Pie

[anders]

Inspired by Skreddy Top Fuel and a DIY muff project One Knob Gilmour I have been tinkering with a big muff circuit using mosfet transistors for all four gain stages along with mosfets wired as diodes in the second clipping stage. I've been using 2N7000's just because I have tons of them but other mosfets like BS170 should work as well.
For more variety I added AMZ big muff tonestack.

Sounds tighter than a regular muff and has more distortion elements than fuzz. If any fancy building this shielded wires is a must since the gain is pretty high and it's on the edge of oscillation when pots is dimed.

Coupling cap values is mostly from Violet Rams Head muffs to give a balanced tone but those could be tweaked to desired values as well as the small BC caps.

[Frank_NH]

Great job, this looks pretty cool!  I love a new take on an old favorite like the Muff.  I wonder if putting a buffer at the input would help with the oscillation on these high gain circuits, but I suppose you could experiment with that.

[storyboardist]

This looks cool. Drew up a schematic in case anyone wants/needs it. Will probably draw up a perf/etch layout eventually. Thanks for sharing Anders!

[anders]

Wow! Thanks a lot! I'm terrible drawing nice looking schematics so your was godsend.

@ Frank NH. Yes, I have the same experience regarding sqquealing high gain circuits, a buffer usually cures it. Will try it when I get back home.

[Frank_NH]

I think I have enough MOSFETs to build this.  You can even use BS170s but make sure to reverse the pinouts!

[Travis]

Just a little side note.. The drain and source of most MOSFETs are interchangeable, so in this case the pinout discrepancies between the 2N7000 and BS170 may not matter

[monasfx]

Nice one! Very nice addition to existing Muff variants. Built it with 2n7000's. Didn't use shielded wire and no input buffer either but no oscillation yet. Thanks for this one!

[monasfx]

I'd like to add that I really like the tonestack of this fuzz, very versatile, you can get many different sounds out of it.