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, July 3, 2018

Pigtronix Fat Drive

Here's an interesting one from Pigtronix. It uses a TL072 to push a CD4049, which is followed by another TL072 pushing a Rat-esque tone control. All the gain stages make for natural compression and tube-like tone without using clipping diodes. Schematic for reference on FSB here (note, I've linked the inputs of the unused stages of the CD4049 to +9v to avoid any unwanted noise). Runs great on 9 or 18 volts and will fit in a 1590B with board mounted pots.


  1. Can you make a bass preamp like mxr bass preamp pedal.

  2. Good morning team, I look for MXR M81 preamp layout !!!!!, thanks and success.

  3. Hi everybody!
    I build it, ( the pcb version) and it worked from the fist Time !
    Sounds Great! I Used the part values from the layout, but substituted the 130k resistors with 120k ( couldn,t get some)
    Another fantastic layout, trank you very much!!!
    And i think you can Mark this as verified!

    Greetings from Austria

  4. What should I change to the bass version.