Beep-it is an optical theremin. It outputs a square wave whose pitch is controlled by the amount of light striking a photoresistor. You control the pitch by casting shadows over the light sensor, or by pointing it towards/away from a light source. Flashing lights induce an interesting oscillating effect. A single momentary button turns Beep-it on or off.
There is an 1/4" output jack for connecting to audio equipment like amplifiers, guitar pedals, recording, etc.
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