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555 Light Theremin

Courtesy/Thanks to: fataltourist.com   © 2003 Chris Prine

Description: From the site:
I first poked around the web looking for light sensitive theremins. I found this very simple light theremin and built it on an experminters board. It's not bad for so few parts (a total of 7), but the sound was kind of weak (sounded like a mosquito).

So I managed to slap together a circuit that uses a 555 to generate a square wave (now it's more like a beetle). Much nicer. It has pitch and volume control, and two push buttons: one momentarily turns off the sound (a "cutout" button), and the other is an octave drop button.

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Files
light_theremin.jpg
   Picture of the 555 Light Theremin circuit bent into a toy.
light_theremin.jpg
   Picture of the 555 Light Theremin circuit bent into a toy.
555theremincircuit.gif
   Schematics of the 555 Light Theremin
Parts used
NE 555
   Timer