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Project Notes

#238 AudioDSP/Crunch

AudioDSP crunchy distortion effect based on the pedalSHIELD.

waveform

Notes

Crunch.ino is a crunchy distortion effect from the pedalSHIELD examples. The pushbuttons control the volume of the output signal.

Core algorithm:

  • distortion is derived from an asymmetrical clipping system based on Schetzen formula

Performance

Not so great. The asymmetrical algorithm results in a fat bottom end but some annoying high-frequency distortion.

See SuperCrunch for the symmetrical version, which is much more pleasing.

AudioDspDriver Library

This example uses a private AudioDspDriver library that contains my refactoring of the core algorithms for driving the board. I may split this out as a stand-alone library at some point.

Construction

Breadboard

The Schematic

Build

Credits and References

About LEAP#238 AudioArduinoDSPOpAmp

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

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LEAP is my personal collection of electronics projects - 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.

Projects are often inspired by things found wild on the net, or ideas from the many great electronics podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know or send a pull-request.

NOTE: For a while I included various scale modelling projects here too, but I've now split them off into a new repository: check out LittleModelArt if you are looking for these projects.

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