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, May 21, 2015

Fredric Effects Unpleasant Companion

While we're on the subject of the Companion Fuzz, here's an adaption by British pedal company Fredric Effects. It replaces the fixed tone stack of the original FY-2 with a Big Muff tone stack, and adds a LPB-1 booster after the volume pot to increase the volume.


  1. You can tag this .. Verified.
    But i'm having a low note hum.
    Even at low volume.
    Tried replacing the 5089 with..
    Mpsa18, 3904.. etc. Same result.
    Can someone direct me to terminating the hum? :) thank you

    1. Have you boxed it? If not it could just need to be shielded in an enclosure.

    2. i haven't boxed it yet. i just tested it thru my test jig and wired it up.
      the low hum is directly proportional to the volume. up the volume and the hum is up.
      i thought replacing the 5088 with mpsa18 will lower the hum. TIA!

  2. The hum is bearable now. Problem is the pop sound is too loud.