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CBA713 wrote:

eatyourguitar wrote:I was just gonna ask everyone about building an IC muff

This is the best IC Muff clone I've heard:

http://www.stompunderfoot.com/PUMPKIN_PI.html

Fun and relatively cheap.


C

phantasmagorovich wrote:I haven't heard it in person, but this one has sparked my interest.

Made by Mike '78 IC Muff.
[youtube]http://www.youtube.com/watch?v=E5a2o4Flnqk[/youtube]

the pumpkin pi has a tone bypass right? is that the only difference other than different guitar and amp etc...?
does anyone know what diodes were used in either of those examples. and what diodes does eniac mike have in his?

I have been trying to figure out if I can make an IC muff with a diode IC and a quad transistor IC. people have done it but documentation is spotty. here is what I found. the IC's are listed above their respective single transistor equivalents.

transistor array 14 pin dip
MPQ3904
NTE2321

discrete transistors
2N3904
2N5088

quad schottky diode array
UC3611

also somewhat related, I got 50 2n5133 from smallbear and I have the highest gains in the lot to be Hfe 350 300 250 200. this is going into the original triangle muff v1 PCB clone I got from Peps1 on ILF. the ic muff is probably gonna be perf cause of the two IC's. I have 6 gruntbox PCB's and one of them is going to be NBABMF's jackalope mod. I'm goin muff crazy. I never knew that smashing pump today was that ic muff sound. pretty cool cause I grew up listening to it and my sound always comes back to the late 90's like my 96 fender strat that I bought in 2009.

Ouch. All those expensive 2N5133's and none of them are high enough gain.

were the ic's for the ehx in house?

http://media.photobucket.com/image/ic%20muff%20vero%20layout/MikeLivesley/Mike_ICBM.gif

I used this layout for the IC muff.
the diodes are 3x 1n4148 in each direction.

I referenced this schematic
http://analogguru.an.ohost.de/193/schematics/EH_BigMuffPi_OP-77.gif

I think the op amps used make a big difference I would breadboard it before committing finalizing anything especially if you try to use quad op amps. I tried subbing different ones and the only way to get the magic was to use the uA 741 and the 4558.

In general I don't think it's the best sounding muff or anything like that, not nearly as much sustain as your typical muff. It does record well and if you have a huge bass line underneath it and james iha playing some sweet creamy leads on it it sits very well as a ripping mid range rhythm muff. I think another part of the sound is running it into a cranked marshall.

tuffteef wrote:were the ic's for the ehx in house?

Nope, just a 741 & 4558, the only inhouse chips they used were there relabelled CA3094, which became EH1048 oh and a few of their FETs were unmarked.

They did have some house numbers for parts but they rarely come up.

so IC muff = op amp muff? what about just doing it with the quad transistor and the diode array IC's. if its too low gain I can just double up. 2x14DIP + 2x8DIP is actually doable on perf on a 1590b. I have a full selection of diodes including germanium. I might have a diode switch on it too. I just dont know what I like yet.

Scruffie wrote:

tuffteef wrote:were the ic's for the ehx in house?

Nope, just a 741 & 4558, the only inhouse chips they used were there relabelled CA3094, which became EH1048 oh and a few of their FETs were unmarked.

They did have some house numbers for parts but they rarely come up.

bingo bango
might give this ago when i can

eatyourguitar wrote:so IC muff = op amp muff? what about just doing it with the quad transistor and the diode array IC's. if its too low gain I can just double up. 2x14DIP + 2x8DIP is actually doable on perf on a 1590b. I have a full selection of diodes including germanium. I might have a diode switch on it too. I just dont know what I like yet.

Knew i'd seen something simmilar before - http://www.super-freq.com/2007/07/swollen-pickle/

and now I know whats in a swollen pickle. I have tried it in the store and it doesn't sound anything like the demos. the little tiny trim pots on the front have very different sounds and its difficult to make small adjustments. does anyone know exactly what the 5 pots are connected to. i mean whats up with the other two knobs and the switch.

Scoop is a pot instead of a fixed resistor to ground on the tone stack, and I'd be willing to bet that the clipping control is a pot acting as a variable resistor in front of the first set of clipping diodes.

Got to stir this shit up again, im thinking about building a Mammoth Op-amp Muff but would want to add a tone-bypass.
How would i do that? i have only built one pedal kit yet and dont feel to confident to go ahead without asking you guys first.
http://www.guitarpcb.com/PDF%20Files/BMP%20OP%20AMP.pdf at this schematic it seems like the tone stack is grounded after C8, would that be the place to put the switch? Like C8 to one outer lug of a switch and the middle lug to ground? As suggested here http://www.muzique.com/lab/tbypass.htm

Any help is good help.

eatyourguitar wrote:and now I know whats in a swollen pickle.

The Swollen Pickle isn't the same as the Op Amp Muff.

The Pickle uses a transistor array. It's a chip with transistors packed inside of it. So it's really just like a standard transistor muff, but the transistors are inside that IC package. It looks like this on the inside:


You could use it to build a double Fuzz Face, a Fuzz Face + Rangemaster, a Tonebender, or anything else with 4 or fewer transistors.



The BMP that uses the 741/4558 is a totally different beast.

culturejam wrote:

eatyourguitar wrote:and now I know whats in a swollen pickle.

The Swollen Pickle isn't the same as the Op Amp Muff.

The Pickle uses a transistor array. It's a chip with transistors packed inside of it. So it's really just like a standard transistor muff, but the transistors are inside that IC package. It looks like this on the inside:


You could use it to build a double Fuzz Face, a Fuzz Face + Rangemaster, a Tonebender, or anything else with 4 or fewer transistors.



The BMP that uses the 741/4558 is a totally different beast.

I'd love to see a TB MKII + Rangemaster (or clean booster) combo with an OpAmp.