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, July 6, 2016

Roger Mayer Voodoo-Bass

Got a request for this one. It's the bass version of the Voodoo distortion. It's a very popular bass effect, especially in Japan apparently, but also sounds great with guitar too. A transistor stage at the input pushes a Rat-like LM308 distortion section, followed by a Big Muff-style tone stack and a simple output buffer. Here's the schematic.


  1. Thank you so very much for this!

  2. just like the RAT, can i replace the IC for LM741? and remove 22Pf??

  3. works perfectly (sound incredible ¿fuzz-drive-distor? i dont know) 100% verified

  4. Its ok if I replace the BC549C for BC548?

    1. I don't think the 548 is low noise like 549. You could probably get away with some other high gain, low noise NPN though (2N5088, MPSA18, BC550, etc).