Yep...another fuzz idea....SCUZZLEFUZZ !

[Dragonfly]

i just came up with this idea...i havent built it yet, as im not around my supplies/iron/etc...but...it *should* give a highly variable, interesting bunch of tones. its mostly "cobbled-together" ideas from various circuits, with a few ideas of my own thrown in for good measure. the values listed are "educated guesses", but should at least be *close*, if not *correct*....if you decide to try building it, please report back with your results....

AC

[markm]

Holy Smokes! 
That's alot of knobs huh??
Looks quite cool though and now my curiousity is up!
I'd say with the amount of control over this circuit, one should  be able to dial up just about any fuzztone desired!

[Moonface]

Frigging insane... 

[anders]

Nice schematic ,but i dont think it will produce much sound,since C6/22uF
will eat your signal.Instead take the signal from the collector .

[brett]

Hi
I *think* that C6 will only eat signal when P6 is set furthest from C8.
I doubt that P6 is a clean control, though.

good luck with getting this working
cheers

[billings]

It's not whether C6 will be able to eat signal off of Q2's emitter, it's whether it eats the signal that appears at the wiper.  Some signal will appear, I'm sure, but even at 1khz it will only be about 300 ohms above ground, and rapidly dropping off after that.

I think that P6 will act like a clean control, though, in much the same way that the fuller 50k input pot does.  As shown, whatever signal Q2 is generating is (I think) going to be very low impedance, and Q3 will have a relatively low input impedance (~47k) so increasing P6 will have the effect of increasing the output impedance of the Q2 stage, reducing its ability to drive Q3.

[anders]

the reactance for a 22uF cap/1000hz is 7,23 ohm, at 500 hz it is 14,4 ohm ,at 250 it is 29 ohm.
1/(2 x pi x hz x farad) = Rx

[Paul Marossy]

Gee, that's more knobs than the T.M.K. 

[billings]

Yeah, I did the cyc/sec->rad/sec conversion backwards.

[newbie builder]

I wanna build that just for the knobs.....that thing looks crazzzy!

[slacker]

I chucked this together on breadboard this afternoon so here's a quick build report.
I haven't got a germanium trannies so for Q1 and 2 I used some 2N3053s which are low gain silicons and for Q3 I used a BC109. The only other changes were 1uFs for C7 and C8 and a 1Meg pot for P6.

You can get can all the normal fuzzface type tones out of it and at certain settings theres some octave up type sounds. Messing with the bias and chunk controls can get you spluttery filth.
The tone, fat and clean controls are probably the most interesting. The tone control goes from fat (some would say flabby) super saturated fuzz at one extreme to a much thinner and cleaner sound at the other.
The fat and clean controls are very interactive. The clean control basically seems to roll off high frequencies and I don't think having it connected to C6 does anything because connecting the wiper of P6 to ground instead seems to do the same thing. The fat control rolls of low frequencies so depending on the other controls you can get a kind of mid boost through to really nasty trebly fuzz. Certain settings of the clean and fat get the octavy sounds.
It's definately worth playing with, I think if I was going to build it to keep I'd get rid of some of the pots and just keep the most interesting ones or replace some with switches.
If I get time I'll post some sound clips

[Dragonfly]

I chucked this together on breadboard this afternoon so here's a quick build report.
I haven't got a germanium trannies so for Q1 and 2 I used some 2N3053s which are low gain silicons and for Q3 I used a BC109. The only other changes were 1uFs for C7 and C8 and a 1Meg pot for P6.

You can get can all the normal fuzzface type tones out of it and at certain settings theres some octave up type sounds. Messing with the bias and chunk controls can get you spluttery filth.
The tone, fat and clean controls are probably the most interesting. The tone control goes from fat (some would say flabby) super saturated fuzz at one extreme to a much thinner and cleaner sound at the other.
The fat and clean controls are very interactive. The clean control basically seems to roll off high frequencies and I don't think having it connected to C6 does anything because connecting the wiper of P6 to ground instead seems to do the same thing. The fat control rolls of low frequencies so depending on the other controls you can get a kind of mid boost through to really nasty trebly fuzz. Certain settings of the clean and fat get the octavy sounds.
It's definately worth playing with, I think if I was going to build it to keep I'd get rid of some of the pots and just keep the most interesting ones or replace some with switches.
If I get time I'll post some sound clips

thanks for the report...i'd love to listen to some of your sound clips...

this thing is just a "monstrosity" that i came up with off the top of my head...i'm sure further refinements can be made, but unfortunately my schedule doesn't "allow" time for it...hell, *i* haven't even built one yet!

besides, i'm really spending my time refining a new overdrive project

AC

[Dragonfly]

..anyone else play around with this circuit idea ?

just wondering...

AC

[amz-fx]

R7 and P7 need to connect to C3, not to the R4/R5 junction...

regards, Jack

[brett]

You might try C1=0.5uF (0.47) instead of 0.5nF so that the bass cutoff isn't too high.  The fuzzface uses 2.2uF in a similar position (tho that's almost too large).
cheers

[Dragonfly]

You might try C1=0.5uF (0.47) instead of 0.5nF so that the bass cutoff isn't too high.  The fuzzface uses 2.2uF in a similar position (tho that's almost too large).
cheers

actually, it works because c2 (4u7) is being used for a "blend", like joe gagans circuits....

AC

[Dirk_Hendrik]

C4 can be omitted since C3 will undo all it's functionality.

[Dirk_Hendrik]

Hmm
That's what jack said already in a different way...