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, July 1, 2016

Harmonic Percolator

Here's the mythical Interfax Harmonic Percolator for Fuzz Friday. It's a pretty unique circuit design and uses germanium and silicon transistors. Here's the schematic for reference.


  1. I have 2 bagged NOS 2N404, motorola. I bought them to make a fuzz factory, cause zvex uses them in addition to AC128s. It occured to me that they might be the exact same thing, and according to several cross reference guides, they are.
    I still haven´t used them, cause I pulled 2 404s from an old PCB I found at a friend´s, so, if any of you want, I can measure them in any way you need.

  2. Hi! I make this Harmonic Percolator. It's a fucking great sound. A lot of fun. You can mess with the timbre using the guitar volume. It's a really peculiar fuzz. Great! Now you can put him on tested section! Thanks for this PCB.

  3. Built it, fuzz sounds great~ thanks for the layout~
    here's some shot share: