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.
Monday, October 12, 2015
Here's an original design by Himmelstrutz Elektro Art, the Fetto. It's a heavy overdrive/distortion circuit using 3 JFETs (probably 2SK170GR, but the names were sanded off the original traced by SoulSonic). These have DGS pinouts, so they're not J201, 2N5457, etc. One of the unique things about this circuit is the number of removable jumpers on the circuit board. These can be removed to tweak the sound of the effect, along side several DIP switches and 2 trimmers. In the layout below, I've replaced the removable jumpers with DIP switches for easier tweaking. The only jumper that isn't on a switch (and I don't think it was removable on the originals) is the one in parallel with the 100nF output capacitor. Not sure why this one is there. You can check out the schematic here.