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.

Wednesday, December 31, 2014

DOD FX55 Distortion (2-knob version)

Last post of 2014. Happy New Year, everybody!

Here's the early 80s DOD FX55 Distortion, without the original switching circuit so you can wire it for true bypass. The original used a TL062 dual op-amp, but the 2nd half of it wasn't in the signal path all, so I went with the single TL061. The off-board wiring pads aren't as neat as I'd like, but I wanted it to fit in a 1590a.

You could fairly easily use this same layout to make the DOD FX50 overdrive with the following mods:

• Change the 1k resistor to 4.7k
• Change the 3.9M resistor to 1M
• Place a 1n capacitor between lugs 1 and 3 on the Level pot


  1. O Lug 1 do Drive é invertido mesmo?! Caso eu queira colocar 500KA eu teria que inverter correto?! Colocar o Lug 3 no 47nF junto com o Lug 2 e o Lug 1 teria que ir para o GND, correto?!

  2. Funcionaria da mesma forma certo?!