Big Muff Pi Opamp kit

Item number: 776

Category: Distortion


starting from 28,00 €

Final price incl. VAT, plus shipping (mitttel)


Shipping time: 3-7 Working days


This Muff version from the 70s uses 2 RC4558 ICs instead of the usual silicon transistors.

This kit contains the pcb and all necessary parts. You can choose an enclosure, please select 3 knobs for 6,3mm shaft separately.
Here´s a list with the parts in the kit: Bill of materials

This project is by, in cooperation with Musikding. If you have any problem with the content of the kits like missing or wrong parts, please contact Musikding (Klaus). For any technical problem relating to building this project, please contact Barry at forum.

You get full technical support at the forum, membership is free of course:
GuitarPCB Forum.,

Here´s the direct link to the building docs, including layout and schematic:
BMP Opamp documentation

Instrument: Guitar Bass
Effect-Type: Distortion

Ratings (9)

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Total entries: 4
5 from 5 BIGMUFF PI V2 OP AMP : great sound !!!

i tried for the first time to assembly a DIY pedal guitar. I chose this team, musikding and i have to say they are great, respectful and attentive

Great team and there is no problem with the elements and the scheme
everything is all right
i really appreciated to assembly and to see that the pedal has been working
the sound is pratically the same distortion sound that billy corgan had on Siamese dream

if you have a problem they answer you rapidly with accurate responses

thanx for your conscientiousness

., 10.02.2016
5 from 5 Very good sound

With this kit I found the Pumpkins tone that I was looking for, but at the end I changed C8=100n and C9=22n to have more mids and cut better through the mix.
Very good also with C8=56n and C9=22n but maybe too middy for grunge sounds (depending on amplifier).

., 20.05.2018
5 from 5 Well done

Easy to assemble, first attempt works well. A+ rated

., 17.04.2021
4 from 5 sweet Big Muff tone

Enjoyed this kit, knocked 1 star off because the Pots arent PCB mounted, which I am used to.... so it makes for a lot of point to point wiring inside the case, which can be a pain.

Board is well laid out,- instructions could be a bit clearer on how to wire everything up...
I had to check a few different GuitarPCB kit instruction sets, to see how the 3dpdt switch is wired into the board..
The sound of this pedal is really sweet, lovely tone, sweet sustain, dense unwanted buzzing or howling.. tone control is a good wide sweep..
I have a Green Sovtek BIG Muff from years ago - and this one has a wider tonal range and has a denser fuzz..
I like the dual mode LED,
great kit overall - recommended

., 19.07.2021
Total entries: 4

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