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April 14, 2016 AT 9:34 pm

Build a Photophone: Transmit Sound with Sunlight

photophone_how_it_works_diagram

The photophone is an easy to make system for transmitting sound using sunlight that was invented by Alexander Graham Bell back in the 1880s. One side transmits sound using sunlight and the other side receives the sunlight and turns is back into sound.

Full build instructions here on rimstar.org.


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