The Light Modulator - Product Review | Make Science Fun

This is the amazing Light Modulator Science Demonstration! Consists of a LED torch with headphone plug, amplifier fitted with a photovoltaic cell and attached loudspeaker with some other paraphernalia.
It's an amazing demonstration, you plug the LED torch into a cell phone and play some music. You then aim the beam at the solar cell and amazingly the light somehow carries the music and it plays on The Light Modulator! Just like magic! The kit contains full instructions and a great description of the Physics behind the light modulation. The equipment can be purchased in the USA, UK, NZ and Australia.