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 13, 2016

Smallsound/Bigsound Mini

Here's a pretty versatile and unique overdrive from Smallsound/Bigsound. The designer, Brian, was kind enough to share his schematic over on FSB, so a big thanks to him! I've laid this out for board mounted pots and added trimmers to help bias Q1 and Q3. I posted the layout on FSB and JohnK has already verified it, so thanks John!


  1. Hello, i have the circuit ready for the test , though i cant find the diode that calls for.Is the 5158 the correct diode? Is there a replacement for it? Thanks in advance

    1. You can use a 4001, 5817, or even a 4148 there. It's just the polarity protection diode.

  2. I only have the 3362 trimpots with the "triangular" pinout. Does orientation of the trimpot matter? Or no, since they are linear?

  3. Hi!Just wanted to point out a few mistakes in the layout.1:The 10n next to 220n i think is 1n.2:The bottom 1k is shown in the last row.3:the reverse underside of the base on the 5089 is wrong somewhere,and 4: After the 10ohm resistor again on the underside.Thanks!!!