Summon Fuzz a bigger muff

Summon Fuzz a bigger muff

This is Mic Tester’s 21st Century Big Muff. Its the standard big at it’s heart but updated. It uses an op-amp for the input and output stages, a James tone stack, and adds an interesting gain control to the clipping stages along with a diode lift switch for the first stage.

I’m a Big Muff fan so I had to build this and give it a try. I designed a PCB in Eagle and had some boards fabricated at PCBWay.com. To keep the costs down I combined this with a couple other orders.

The boards came out well. So the next step was to mill an enclosure. Put some art together really fast. Some times it’s better that way. If you think about something too long you can over think it.

Next I soldered the boards. I built this with a 3PDT PCB and a ribbon cable. Soldering this outside the box was quick and easy.

Then I put everything in the box and soldered the jacks and switch.

Last, sign the box and put some knobs on it!

How does it sound? Sounds like a big Muff. That’s funny thing about Big Muff circuits, they all sound the same. This one has a wider range of tone adjustment. Rather than a single pot you can dial the treble up or down, and do the same with the bass.

It also has a wider range of gain settings. The gain pot gives you sounds of Muffs with different emitter resistors, though this control is really adjusting the collector resistor. There is a lot of interaction between the Sustain, Gain, and Volume.

There is a also a diode lift switch that removes the clipping diodes from the first clipping stage which gives you another option.

With all of these options it still has the character and quality of a big muff.

Would I build this? I suppose I would because I did! Should you build it? If you’re a Big Muff fan and you don’t care how many Big Muffs you own and you want to own them all, build this one! If you just want a more flexible muff, build this. If you own a Big muff or two and you’re happy with those, you might not need this one.

Part
Value
R12M2
R21k
R3100k
R422k
R51M
R61k
R71k
R810k
R982k
R10100r
R11470k
R126k8
R13100k
R1410k
R1582k
R16100r
R17470k
R186k8
R19100k
R20100k
R2122k
R2222k
R231M
R241M
R2522k
R2622k
R27180k
R2810k
R291k
R3022k
R311k
BASSA1M
SUSTAINA100k
TREBA470k
VOLA470k
GAINA100k Dual Gang
CLIPSPDT
D11N914
D21N914
D31N914
D41N914
D51N5817
D6LED
C1100n
C210n
C3100n
C4100n
C5560p
C647n
C7560p
C847n
C9100n
C10100n
C111n
C1210n
C13500p
C145n
C1510µ
C16100µ
C1710µ
C1810µ
C1910µ
C20100n
C21100n
C2210µ
Q12N5089
Q22N5089
IC1TL072

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