Fork me on GitHub

Project Notes

#262 GuitarEffects/BazzFuss

The Bazz Fuss “chocolate noisette” - a super-minimalist overdrive/distortion/fuzz effect circuit.



I saw DIY Guitar Pedals build and demo the Bazz Fuss on youtube and had to try myself .. just to see how good it really is for about the simplest effect circuit I’ve ever seen.

Although not the true origin, the main source of information about the Bazz Fuss circuit appears to be at

I tried the first, most basic, circuit (v1) on a breadboard and was pretty impressed by the sound.

I’m using an S9013 (chosen because I know it is a little dirty), and I ended up placing two in a Darlington configuration, though it only contributes a little to the waveform.

Here’s a comparison of a single S9013 and an S9013 pair.

  • CH1 (yellow) - 1kHz 2Vp-p sinusoid
  • CH2 (blue) - output, with output pot full on

First a single S9013:


And then with an S9013 Darlington pair. Only a minor difference, but you can see that it retains more of the original peak shape when clipping. I think this adds a little more warmth to the sound.



Lovely warm distortion (chocolatey?). It does pick up quite a bit of RF noise (the wiring and non-shielded box I used in the final build don’t help).

Here’s what it does to a 1kHz 2Vp-p signal in the final build:





Testing on a breadboard:


Protoboard layout:


Construction complete … the internals:



Credits and References

Project Source on GitHub Project Gallery Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects. Two main themes have emerged in recent years, sometimes combined:

  • electronics - usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.