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, February 17, 2016

Run Off Groove UBE Screamer

Apparently it's Tube Screamer week. This is Run Off Groove's adaption of the classic overdrive to work around a CD4049UBE CMOS chip. More info, schematic and sound clip here. As you can see in the schematic, there's a resistor (RX) where different values will work for different guitar pickup types: 100k for single coils, 220k for humbuckers, 330-470k for hot humbuckers. I've included pads for a switch that will allow you to switch between 2 of the options. If you use the switch, remove the 100k resistor (which is RX) right by those pads from the board.


  1. I've built the perfboard version. It works fine, so it's verified. It fits into a 1590b, even with the pickup switch.

  2. Qustion about "coil" resisitor. Its output or input line?