[kaizmoto1489 (OP)]

Hi everyone,

I saw a TV documentary about Arthur C. Clarke where on his farm he built a device which converted speech into light pulses which were picked up at the other end of the farm by his brother holding a device which converted the light pulses  back into speech.

Does anyone know how he did this and can it be replicated?

I'm having a great idea with it.

[Colin2B]

This was answered here https://www.thenakedscientists.com/forum/index.php?topic=80548.0

[evan_au]

Arthur Clarke wasn't the first.

Alexander Graham Bell's lab produced one in 1880, the photophone:
https://en.wikipedia.org/wiki/Photophone