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This amazing demo shows how you can transmit sound over a laser beam. The transmitter modulates power to a laser pointer with audio from a headphone jack. The receiver is just an earphone and a solar cell; no power source. I assembled both in minutes, and it was strange (in a good way) to hear music whenever I held the cell in the beam. As seen in MAKE Volume 16, the Spy Tech issue!

Paul Spinrad

Paul Spinrad

Paul Spinrad is a broad-spectrum enthusiast, writer, maker, and dad who lives in San Francisco. He hatches schemes at http://investian.com.


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