Popsci has a quick how-to on building theremin-esque device for under 20 bucks –
A full-fledged Theremin will set you back nearly $400, but with the instructions below, you can build a pocket-sized Theremin-like instrument that won’t break the bank. Unlike the real McCoy which relies on grounded variable capacitance for changing frequency and volume with the wave of a hand, our Pocket Theremin uses variations in light for producing its unearthly vibrato.
Interesting choice of enclosure – Build a Pocket Theremin on the Cheap
Related:
HOW TO – Make a Theremin
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