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, September 23, 2016

Durham Crazy Horse

For Fuzz Friday here's an really interesting circuit from Durham that's both an overdrive and a fuzz. As the name implies helps you get some Neil Young tones, but does a lot more than that. The input stage features soft clipping in the feedback loop of an opamp,  much like a Tube Screamer. The 2nd half of the opamp acts like a buffer, pushing a Fuzz Face-style stage. This then pushes another Fuzz Face-style stage that feeds into a Big Muff tone stack. The addition of the Volts control to starve the opamp of voltage makes this a really versatile pedal. I've laid this out with on board pots that will ideally fit in a 125B with top mounted jacks. Here's the schematic for reference.


  1. This is a cool fuzz/distortion. Kinda reminds me of the sound of LIVE RUST over other Crazy Horse stuff. It has this harsh edge which is rad. It's more the sound of the recordings rather than the sound of the actual amp... if that makes sense.

  2. Replies
    1. D5 isn't connected in productions circuits, so I left it off.


  3. Verified friend, thanks for your work!

  4. Any Led color will work the same or green is a must for the desired crazy horse tone? Thanks


  5. Friend, I'm served 2n2222 ?? and what should hfe have ??

  6. it doesn't work on my second built.... i d'ont know ho to fix it.... led orientation, cold solder.... can anyone give me some info about voltage on transistor and op amp?