Author Topic: Big Muff (Mudbunny Board) Tone bypass on a Switch  (Read 263 times)

ryanisradd

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Big Muff (Mudbunny Board) Tone bypass on a Switch
« on: July 11, 2018, 09:54:53 AM »
Greetings y'all!

I feel in love with the tone bypass sound of the IC Muff (Pig Butt) and loved that you could put it on a foot switch and essentially have two different pedals in one circuit. I'm trying to do the same with the Mudbunny PCB now and am having trouble wrapping my head around it. I've been trying to use the Pig Butt schematic to cross reference the switching with the Mudbunny schematic but so far my efforts have not been fruitful. I'm thinking the start of the bypass would be around C10? I'm sure people have done this mod before I was wondering if I could get nudged in the right direction!

Thanks!
Ryan
I make some pedals with my wife from time to time, we're called EAR electronics.

JackSkellington

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Re: Big Muff (Mudbunny Board) Tone bypass on a Switch
« Reply #1 on: July 11, 2018, 11:41:23 AM »
This could be useful to you:
http://tagboardeffects.blogspot.com/2015/12/madbean-pig-butt.html

Here's the document of the Pig Butt:
http://www.madbeanpedals.com/projects/PigButt/PigButt_2015.pdf

And here's the Mudbunny: http://www.madbeanpedals.com/projects/Mudbunny/docs/Mudbunny_2015.pdf

But I suggest a thing. The Mudbunny is based on the traditional transistor Big Muff, so you should search something about the "tone bypass mod" for the Big Muff.

I attached a schematic. It has two extra caps C15 and C16 for some reason I still am not understand, and an extra resistor, R28, to avoid a volume boost. Try to make some experiments.

Let us to know! ;)
«Just because I cannot see it doesn't mean I can't believe it»

ryanisradd

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Re: Big Muff (Mudbunny Board) Tone bypass on a Switch
« Reply #2 on: July 27, 2018, 09:52:01 AM »
So I got it figured out in case anyone is looking to do this sort of thing in the future. I came across this page: http://www.muzique.com/lab/tbypass.htm which made it pretty simple. I just cross referenced that with the mud bunny schematic and figured out I just needed to lift the grounds on C11 and R18. I put that on a 3PDT with an LED and it worked like a charm. The extra boost you get from removing the tone stack is awesome! Sorry the guts are a little gross in this one, there is a vero blend circuit in there as well (its for Bass). Hope this helps someone out down the line! And thanks for the info JackSkellington!
I make some pedals with my wife from time to time, we're called EAR electronics.