Transmitting Sound using Sunlight - The Photophone

How to make a photophone to transmit sound using sunlight. This invention by Alexander Graham Bell works by reflecting sunlight off a mirror, which is attached to a speaker, to a solar cell and from there to an amplifier.

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For a diagram of how it works, see my webpage here:
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See also:

How to Make Crystal Radio Amplifier for Speaker
   • How to Make Crystal Radio Amplifier f...  

Pyramid Hologram - How to Make/How it Works with Princess Leia Hologram
   • Pyramid Hologram - How to Make/How it...  

How a Prism Works to Make Rainbow Colors
   • Pyramid Hologram - How to Make/How it...  

The inspiration for this was a comment by Michael Meadows under my video Hand-Cranked Laser - TEA Laser Powered by Wimshurst Machine    • Hand-Cranked Laser - TEA Laser Powere...  . Thanks Michael!

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