Optical Tremolo 2.0 | Make:

The optical tremolo is a simple but powerful musical instrument FX box that reads a pattern printed on a rotating disc and converts it into a volume-modulating “tremolo” sound. Changing the sound of the effect is as simple as changing the pattern on the disc, which you can do by drawing, painting, taping, or applying a printed label directly to its surface. The idea is based on a concept proposed by Charles Platt in his 2009 book Make: Electronics.

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