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.

Thursday, July 9, 2015

Wampler Distortion Plus Mods

A while back Brian Wampler shared a bunch of mods to the classic MXR Distortion Plus circuit in Premiere Guitar magazine. It adds a tone control, a switchable soft clipping stage, a compression switch, and a bass boost switch.


  1. Wow brian mods...biggest thank for you brother :)
    Just 1 question, are this verified ?

  2. The Drive pot is backwards but it works great. Mark it verified.

  3. Built tonight, sounds really good with the mods! The gain pot is still backwards, so not sure if maybe the update didn't get uploaded. Still works as it should otherwise, thanks!

  4. verified!
    I made some changes:
    Gain pot is better use log pot (as original wampler mods)
    Tone stack is useless, I changed for a100k pot and 22n capacitor and it works very much better (22n to 68n works fine)

    1. And reversed tone pot for high tones clockwise