DIY Optical Tremolo effect pedal
Source: http://makeprojects.com/Project/Optical-Tremolo-Box/2276/
Made entirely out of parts found at RadioShack... Time required: 5 hours Difficulty: Moderate
MAKE contributing editor Charles Platt proposed a "Hypothetical Tremolo Wheel" in his article about online DIY guitar stomp-box communities (MAKE Volume 15, page 82, "Stomp Box Basics: Tremolo and Fuzz").
Well, it's hypothetical no more. [MAKE] took Charles' cue and built this Optical Tremolo Box, which reads a patterned disk with a light sensor to create a warbling volume effect (tremolo) that you can custom-program with any pattern you like.
Source: http://makeprojects.com/Project/Optical-Tremolo-Box/2276/
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