The most dirty, filthy, horrible fuzz circuit out there?

[Havaden]

Whats the worst fuzz out there? (in a good way)
Im talking about a pedal that will completely destroy the guitar signal and make synth-like noise 

Is the fuzz factory the only option out there?

[armdnrdy]

You don't like the sound of guitar do you?

Build a couple a fuzzes in series...that should destroy the sound a bit!

[italianguy63]

I built a handful of regular '67 FF's lately with very high gain/high leakage NKT275s recently.  They were pretty ugly and did some bizarre things.  They were hard to get biased.

MC

[GibsonGM]

555 anyone? LOL

I'd recommend you build 3 or 4, on breadboard....consider which leans more toward where you want to go, and tweak from there!  
Net search will find you tons of stuff, esp. if you look up Fuzz Central....

[cloudscapes]

this is highly relevant to my interests

something similar to the smallsound/bigsound f**k overdrive maybe?

[Havaden]

Just happened to come across this in the 1590a thread:
https://www.youtube.com/watch?v=ANuBtz3tY9g


Its pretty nasty 
But i think i will try it with a fuzz face in front or something..

[rousejeremy]

Mid Fi Electronics Random Number Generator.
Mid Fi Electronics Glistch Computer
Blue Box.
5 Fuzz Faces in series.
10 Fuzz Faces in series.
10000000000000000 Fuzz Faces in series.

[slacker]

This is pretty horrible if I do say so. The layout seems to have disappeared I'll find it and post it if anyone's interested.

[nocentelli]

...destroy the guitar signal and make synth-like noise  

Escobedo's Uglyface and PWM truly destroy all guitar nuance, the squarewave shaper is also pretty brutal:

http://www.jiggawoo.eclipse.co.uk/guitarhq/Circuitsnippets/snippets.html

There's many sick reworkings of these originals out there too, e.g. http://www.geocities.ws/diygescorp/xorus.jpg

I also like the way most of these circuits gate the decay so it's not all squeal, noise and hiss when you stop playing

CMOS inverters like the 4049 come in packs of six, which is enough to do three red llamas in series  

[Mark Hammer]

Even the most banal distortion will produce tones from hell if you crank it up and stand in front of an amp.

That said, when people make requests like the OP's, often what they seek is something that is predictably unpredictable.  It's not so much the tone that is filthy, horrible, dirty, or whatnot, but the inability of the player to plunk out an identifiable melody in the face of all that....stuff.

The MXR Bluebox has a track record of producing a reasonable fuzz, but more importantly, not tracking exquisitely.  Seems to me that one can tinker with the circuit and make the tracking even less predictable.

I've often waxed poetic about the combination of an MXR Distortion+ going into an Ampeg Scrambler.  The Scrambler is likely the least well-behaved of the rectifier-based octave-fuzzes.  When you push its input hard, and with a sustained signal (such as an overdrive like the Dist+ produces), it misbehaves even more, and will even "implode", such that the signal collapses and takes a bit to regain its composure (such as it is).

[Freppo]

The most intense fuzz that I have built is the Mountainking Megalith

Otherwise I would say my own Raygun Youth Chaos Fuzz fits your discription well. 

[Processaurus]

With adding more and more gain, once it has enough gain to make the guitar into a square wave, the sound doesn't change much, it just has more noise when you aren't playing.  How do you get grosser?  Wave folding effects can come to help here.  If you fold the wave up before your clipping stage, it generates extra, higher frequency square waves, because the wave going in to the distortion/clipping stage has more zero crossings.  Any of the full rectifier octavia effects can work (the Scrambler Mark mentioned is great).  If you want to get more esoteric, Tim Escobedo's Triple Fuzz is a great distortion accessory, it does crossover distortion, that really cuts through even the heaviest fuzz.  Another favorite of mine, in a similar vein, is Jeurgan Haible's Wave Folder B.

[Processaurus]

This is pretty horrible if I do say so. The layout seems to have disappeared I'll find it and post it if anyone's interested.

Wow, that is pretty wretched.  I would say that would get 'em there.  I like around 1:00, where the fuzzing actually gets quieter and grosser the louder you play.

[Buzz]

Try the Thulsa Doom.

It's extreme.

http://www.diystompboxes.com/smfforum/index.php?topic=104699.0

[digi2t]

My top noise makers are (no particular order);

Uglyface
Parallel Universe II
WMD Geiger Counter
Skyripper

Freppo's Raygun sounds amazing too, though I haven't built one yet.

Tim Escobedo's Digital Octave Fuzz can be pretty brutal as well, espescially so when combined with an LM567 pseudo ring-mod (Logan-5). I did a combo pedal a few years back, and it's still on my board.

[glops]

Mountainking Megalith - probably the heaviest nastiest fuzz I have made. Doesn't do any sputtering but its synthy and so brutal. Will always be a favorite.

Uglyface - definitely one of the go-to guitar destroyer fuzzes.

Recently I acquired a Death by Audio sound saw but made by another builder. Throwing that after any fuzz makes it nastier and sicker for sure.

Always wanted to revisit the Dirty Sanchez circuit.

Always wanted to try the xor sick, as well

Also, there;s the parallel universe that I haven't tried.

Also, look up the TMK from Tim Escobedo. Doesn't seem like too many people built that one but it probably fits here...

[stringsthings]

This is pretty horrible if I do say so. The layout seems to have disappeared I'll find it and post it if anyone's interested.

I would be interested in building this if you have the layout. 

[davent]

This is pretty horrible if I do say so. The layout seems to have disappeared I'll find it and post it if anyone's interested.

Ian, I've got your build document PDF if need be as it's no longer linked in the Turkey Day Shootout thread.
dave

[aron]

A long time ago I bought a Fender Blender because I thought it was the worst fuzz I ever played and I bought it on that alone.

[Brisance]

How about doing what my first fuzz was, just an opamp with variable gain from unity to open loop, just make sure to add a volume pot after it to tame it.