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.

Friday, December 16, 2016

Heavy Darling Fuzz

Found this one over on DIYSB and thought it'd be a good Fuzz Friday layout. It was designed by Dragonfly for the old FX-X contests. Here's what he had to say about it:

The Heavy Darling is a SIMPLE fuzztone that cleans up great, has old school character, and good sustain...pretty much ANYONE who can solder should be able to build this one. It uses a MPSA13 Darlington transistor in the 1st stage that pushes the 2N3904 into full saturation. The 220k resistor limits the amount of saturation, and you could certainly experiment with values here. A pot could also be used to give some variable gain, and you could even set up the pot in a similar manner to the Orpheum, Fuzzrite, and Shin-Ei style fuzzes.


  1. Replies
    1. Oh sorry about that. Q1 is on the left, Q2 on the right.

  2. verified, but I guess I really need to play around with 220k resistor like mentioned above to get more saturated sound.

    awesome as usual

  3. hi can . you tell me what software you use to make the designs?