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).

  5. Is the position of the transistors correct?