Double Muff

[aron]

First off, it's very close to the posted schematic but there are a few changes. I'm documenting them and have proposed changes I will make.

I think this little box is very well made for the money. It's not at all like the older EH stuff. The board is nice, it's true bypass, there's an LED and it's easy to understand.

The single muff mode is exactly like they describe (slightly distorted speaker tone), but it's missing a lot to me.

I'm going to make it more lively and shape the double distortion a little more too.

[B Tremblay]

Very interesting!  Where is the schematic that you mentioned?

How is the double mode?

[Dragonfly]

Very interesting!  Where is the schematic that you mentioned?

How is the double mode?

a quick search got this, which is likely the schemo he's referring to, but i'll keep looking...

http://www.diystompboxes.com/sboxforum/viewtopic.php?p=186619&highlight=double+muff#186619


the double mde is very cool...more like a nice distortion/fuzz hybrid with lots of sustain....i have one here that i could send you to check out, if you'd like....

[brad]

That's not the EH Double Muff schematic...that's just an experiment I did running two opamp muff fuzzes into each other so I could try out a quad diode array.  The real Double Muff that's on the market right now uses the transistor version of the Muff Fuzz if I'm not mistaken.

[Dragonfly]

That's not the EH Double Muff schematic...that's just an experiment I did running two opamp muff fuzzes into each other so I could try out a quad diode array.  The real Double Muff that's on the market right now uses the transistor version of the Muff Fuzz if I'm not mistaken.

ahh...just found it on a quick search...hadnt had time to check it out...

heres another link regarding "sound" on a double muff...the consensus is that its simply two muff fuzzes cascaded, so that might give you a start onthe schemo...

http://www.diystompboxes.com/sboxforum/viewtopic.php?p=166509&highlight=double+muff#166509


of course in this thread, Aron suggests its closer to 2 fuzz faces cascaded....
http://www.diystompboxes.com/sboxforum/viewtopic.php?t=20135&postdays=0&postorder=asc&highlight=double+muff&start=0


i suppose i'll just have to open mine up tonite....

[WGTP]

One version is like a SI FF with diodes at the output.

The other is a dual inverting op amp with diodes in the loop of the second.
I really like this one.

I'm not sure which the DUAL is.

Maybe one of each???   That's not a bad idea, but I doubt it.    

[aron]

Here you go, there's a mistake. The diode clippers should go to ground, not V+ on the schematic.

It's like 2 Fuzz Faces in series. VERY COOL!

The "main" one is low distortion - tuned for hardly any distortion. The other is  similar, but since they cascade, they have more distortion overall.

Of course I will juice up the main one and give it more of everything.

[B Tremblay]

OK, I get it now.  Actually, the transistor Muff Fuzz was my first-ever DIY effect project!  Strangely enough, Jack Orman's Muffer was my second fuzz build and one of my experiments was to run one into the other.

[aron]

Cool! You don't have to look very far to see that 2 LPB-1's in series was a very defining moment for Peavy.

[Ben N]

and I'm psyched.  I guess the first thing to do is to socket the tranies, and maybe the diodes, and then we're off to the races!  (Well, ok, I guess I'd better wait for it to get here first.)
Ben

[aron]

hmm my post got lost.

DOn't put a bypass cap on the first circuit. WAY TOO MUCH distortion - into the white noise range on mine! Full on oscillation too!

100 ohm resistor on Q1 emitter ala Gus.

I did put a smoothing cap on the output pot (.001uF or .003).
Asymmetrical clipping (1N34a) on the 2nd circuit with smoothing cap across the diodes.

so far...

[petemoore]

I'm getting on this wagon...if it looks like it has any kind of feedback amp in it...this seems to have two !!!!

[petemoore]

This works PDGood !!!
 Had alot of troubles with Q4 collector's bad trimpot , and had to change the 10k R on Q2 to a lower value to get it baising. These arethe Q2's of each FF, I'd use a trim on both probly next time...
 Here's the funny thing I can't figure...when I put BtB diodes from Q4 collector to ground, the bias on the collector drops from 5.5v [of 10v battery] down to .8v, and this puzzles me because it's just a socket there, from ground only to collector and the output cap. I measured the diode pair both ways and they read like a Si diode either way...I tried another pair, same same.
 Thing is though, this is serious Fuzz, and very tunable [diode-less].
 Tuning the first second and third gain knobs, together with biasing for assymetrics...well it's just like tuning two seriesed FF's...pretty fun and lots of interesting tones along the way.
 Of course I socketted tranny's, using low gainers towards the front end seems cool, all kinds of variables with this setup. Mosfet biased, mongo gain.
 Cleans up remarkably well [if tuned to do so]..for a dual FF anyway.
 Also, overdriving the overdrive tones are easy enough to get also...just turn the knobs up and it becomes quite Ill  :twisted: .
 Well I 'slept on it', so today I'll try using a cap to 'connect' the Q4 output to diodes, then through the [since it's in there] 'other' output cap, and see if I don't get less V drop across the Collector !!!
 I think this could have caused smoke to rise and orange glow to come from Q4's trimpot !!!  :roll:

[petemoore]

Who has built this ?

[aron]

We are modding a real Double Muff. I really wanted to start a project showing how to mod a commercial pedal, but I guess the pedal was too cheap to get enough people interested.

Anyway, I decided to do it myself anyway and I will post results.

[petemoore]

I seriesed the two Muff Fuzzes [ 2Q ], on a small Perfboard piece.
 And have been modifying and playing it.

[WGTP]

Seeing this made me think of the Axis Face III up the page.  Guess you could do 2 of those and add diodes.  

Does this sort of approach the original OBSIDIAN territory?   :twisted:

[aron]

No, the Obsidian is king. oops KING.

[WGTP]

I'm sorry, I don't mean the Mosfet one, the one that sort of looked like 2 fuzz faces and used 2N5089's.  A predissesor to the Black Fire.  

[Mark Hammer]

Boy oh boy, some things just refuse to die.

The Muff Fuzz shown in the composite schematic page earlier in this thread (with LPB-1, etc.) is WRONG!  The diode pair shown should go to ground not to V+.