Michael Una's Beep-it optical theremin is $29 $35 in the Makers Market / Boing Boing Bazaar.
Beep-it is a handbuilt optical theremin designed by Michael Una.
It outputs a squarewave whose pitch is controlled by the amount of light striking a photoresistor. A single button turns it on or off.
It has a 1/4" out jack for connecting to audio equipment like amplifiers, filters, recording, etc.
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