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, April 23, 2015

Jen Fuzz

Jen was an Italian manufacturer in the 60s and 70s that produced their own line of effects in addition to OEM stuff for other brands like Gretsch and Vox. This fuzz effect is essentially a Fuzz Face with an emitter follower up front and clipping diodes on the output. It produces a treble-heavy fuzz with a good bit of volume. Original transistors were BC238B for Q1-2 and a BC239C for Q3. Some schematics floating around call for 2N5088s, but shoot for transistors in the 200hFE range (2N2222, 2N3904, etc). This layout should fit in a 1590A, and if you drill the enclosure right, you could board-mount the pots using long-leg right angle PCB pots (mounted from the component side).


  1. Hi,

    My setup: Q1 2n2222 hFE ab 140, Q2 2n2222 hFE ab 240, Q3 2n5088 hFE ab 440, D1 and D2 german, last Capacitor 100 nF.

    "Sound fly over the finger" - you know what I mean.


  2. Replies
    1. I think that D3 is for polarity protection so you could try either 1N4001 or 1N5817

  3. Love its crunchy bright sound! My demo at