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.

  3. I can second this one as verified, with no excessive hum or switch pop.

    The sound is reedy and raspy, with a slightly soft attack. While not meaty, the fuzz is over-the-top and mangles anything besides single notes and power chords. Compared to the FY-2's notch filter, the muff tone stack here does not scoop the mids as deeply, giving the circuit a more balanced and usable sound in the middle position. The tone pot gets pretty muffled below about 11 o'clock, while going clockwise gradually dials in a vintage "mosquito attack" fuzz sound.

    On, Mark Hammer found that swapping lugs 1 and 2 on the fuzz pot of an FY-2 resulted in a much wider range of sounds. After trying the swap with this circuit, I would agree.