This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Friday, October 9, 2015

Mad Professor Fire Red Fuzz

Here's Bjorn's take on the classic Big Muff circuit. JFETs are used as clippers in the first clipping stage, and a JFET-based gain recovery stage is used instead of the traditional BJT one found in the original. You can use board mount pots from the solder side using right angle PCB mount pots.


  1. Hello
    The PСB has a bug.
    On PCB +9 red track directly connect to Q2 colleter. But on layout its connect through 10K resistor.

    1. Thanks for catching that. It's fixed now.

    2. Are you welcome :)
      Thanks for your work

    3. dude, this also happened to crunchbox. check on the 1M resistor between the 470 ohm and 10K resistor. care to check?

  2. Verified and sounds great!
    Seriously, really good Muff

  3. sounds great and tight, but the Drive pot is better using linear