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.

Thursday, February 12, 2015

Earthquaker Devices Speaker Cranker

Here's a simple one that should fit nicely in a 1590a. EQD's take on the Electra Distortion circuit. Instead of having a pot coming off the end of the circuit, the volume is controlled by a pot coming off the emitter of the 2N3904. It's really more of a gain control than volume and if you wanted to, you could add a master volume control coming off the output. Who doesn't love more knobs, right?


  1. Great layout, pedal and blog! :)

  2. The best Electra's based boost!

  3. It seems that the pot is b10k

  4. Have you ever considered adding the schematics as well or do you just do the layouts based on tracing out the existing pedal circuit board? By the way, amazing site, I can't imagine the amount of time you have spent on this.

    1. Thanks, man! Most of the schematics can be found either by googling for them or looking on Guys over there trace a lot of stuff.

  5. hi.
    just bread boarded and i have replaced 0.47 cap for 68 and it sounds nice.
    really nice pedal.