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?dn-?p?s-????? ???q s??? u?n? o? ?o? ?no ??n??? ?? u??? ?u??sod ??ns?? ll?M ???lqo?d ? ?o ??q ? ?u???H link [kudos Make:]

Optical Theremin

Check out this optical theremin with schematic using a circuit hacker’s favorite 555 timer chip. Expect a square wave rather than sine wave output. link [via Make:] Previously: Theremin Student Design Projects, Theremoid FilmFest