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, March 9, 2015

D*A*M GB-80 GreaseBox

Here's the germanium version of D*A*M's GreaseBox fuzz. It's based on the Tone Bender Mk. III but without the tone control. Q1 and 2 form a darlington pair to amplify the signal, and Q3 provides the fuzziness. The original units are positive ground effects and use PNP germanium transistors. That is reflected in the perf side of the image below, but for the PCB, I laid it out for negative ground for those of you who (like me) have a bunch of NPN germaniums.


  1. Any advice for transistors hfe?

    1. Pretty low for Q1-2 as they form a darlington pair, and then around 100 for Q3. It's much like a Tone Bender Mk III without the tone control.