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With a bit of PVC, a laser, a can/cup, and a small mirror, you can make a device that visualizes you voice or any sound transmitted into the cup/can.

In this activity/demo about piezoelectricity, learners discover how some crystals produce electricity when squeezed.

From this How To slide show, you create an Audio Tape Bow that can play distorted audio sounds by running it across a tape head.