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Posted by Daniel Hulbert on November 13, 2012 at 12:53am

http://circuitsandstrings.wordpress.com/2012/11/13/ukulele-with-optical-pickup/This cigar box ukulele is equipped with an infrared optical pickup system. One 9 volt battery provides the power for green power indicator LED, as well as the 4 emitter and 4 collector diodes.

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