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, August 4, 2017

Jon Patton's Mossy Sloth

Finishing out Jon Patton week with the Mossy Sloth Fuzz for Fuzz Friday. It's a pretty unique transistor-based fuzz and uses MOSFETs to create some asymmetrical clipping for some unusual fuzz and distortion sounds. Loads more info can be found here.


  1. The connection of the 10nF cap and the 47k resistor should be by itself. As is, this junction connects straight to Q3's collector. Otherwise, the layout works.

    The effect is a nice, mid-focused hybrid of a lighter fuzz and an OD. I second the build document's recommendation to socket the 4.7k resistor on Q2's emitter and the 3.3k on Q3's collector so you can tweak the bias on those transistors. Once I got Jon's suggested voltages, I got a better range out of the gain pot.

  2. Sorry, I meant to say that the 10nF/47k junction needs to be separated from Q2's collector, not Q3's.