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.

Tuesday, April 28, 2015

Run Off Groove Umble

The Umble is the result of Brian Tremblay's (ROG) adaption the the mythical Dumble amplifier into a FET-based distortion box. I've drawn the layout for on board right angle PCB pots and added a 1N4001 diode for polarity protection. Should fit nicely in a 1590B. Check out the ROG article for more info.


  1. Verified
    Sounds amazing

    1. Good looking build. Thanks for verifying.

    2. Forgot to mention that mid pot must be flipped 180