Jan 04, 2015 · Tim Escobedo's design with a few mods. Switchable transistors between MPSA18 and 2n3904, and a compressor on off switch with clipping diodes. Steve Albini made this rare pedal famous, the ... Sep 22, 2012 - Explore jeremiahboothe's board "Electronics for Musicians" on Pinterest. See more ideas about Electronics, Guitar diy and Diy guitar pedal. The Fredric Effects Harmonic Percolator uses the correct vintage transitors (NOS 2N404 Germanium and 2N3565 Silicon) and 1N695 diodes - all the hard-to-find parts of the originals, but in a modern pedal-board friendly package, with DC power, LED indicator and normal rotary pots instead of sliders. Re: Harmonic Jerkulator « Reply #6 on: August 09, 2013, 02:05:54 PM » You could, but it's quite lossy so if i was building it as a standalone pedal, I'd incorporate a gain recovery stage after it: You might want some sort of buffering or boost before as well.