This “Noise Box” is based on the gating properties of the 4066 Quad Switch and is amplified with an LM324 Quad op-amp to produce some truly horrifying noise. “Sound” would be too pretty a word to call the sonic mess this device creates. The project runs off of two sets of 9 volt batteries while there are a couple RCA jacks for the sound to output to an amplifier if you feel like waking up the entire neighborhood and converting this to an alarm clock.

Noise Box