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Synthrotek Evil Eye Optical Theremin

Synthrotek Optical Theremin

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The Synthrotek Evil Eye Optical Theremin is one of our wildest circuits! Two optical resistors, sensitive to light shining upon them, control both the pitch and volume of a standard 555 timer in astable mode. The result: a chaotically cool noisemaker!

Two potentiometers allow for setting levels and sensitivity of both optical resistors. The circuit is simple to build and powered by either a 9V battery or a 9V AC Adapter. Loads of fun and highly adaptable/modifiable, you'll see the light with the Synthrotek Evil Eye Optical Theremin!

Uses a 9VDC center negative power supply (not included) or 9V battery.