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.

Monday, February 6, 2017

Wren & Cuff Phat Phuk B

The Phat Phuk is a boost from Wren & Cuff that combines a JFET stage with a germanium transistor stage. This got traced over on the Tagboard Forum and the original that was traced was the B version. From Wren & Cuff:

Here’s what the Phat Phuk is: A germanium/JFET booster. A unique sounding pedal which adds a beautiful sheen to your bass’ top end and a bit of grit to the overall tone. It’s a fantastic pedal for situations where you want a lift in your overall level, during a chorus or bridge for example, with a bit of bawdy bump via the germanium transistor.

The exact germanium transistor is a Chinese PNP on the originals, but others can be used. Shoot for around 90 hFE. On originals there is a trimmer that is essentially a gain control. I've laid it out so that you have the option for a trimmer or external board mounted pot on the same board. So if you want the pot externally, don't populate the trimmer and vise versa. Here's the schematic for reference.


  1. I've got a question, the new version of the Phat Phuk B (called Suppa Phat Phuk), beside the external Bias pot like in this layout, got an extra "phatness" (tone like) control, any hint to how to mount that extra pot in this layout (if possible)?

    1. I would assume it's a pot that goes between 2 different caps going into the germanium section. I'd wire it with a 100n cap and 10µ (negative side) replacing the 4.7µ cap, then the 100n cap to lug 1 of a B100k pot, the positive side of the 10µ to lug 3, and then lug 2 going to the base of Q2. Most of that you'd have to wire off board though.