I am entering a competition in ireland and i am investigating the theory that sound energy can be converted into eltricity??? If you have any ideas please post!! 
Sound to Electric enrergy?``
think "MICROPHONE"
You need a constant supply
Where will you find an unlimited supply of sound that has enough energy over a constant period to be economical.
Where will you find an unlimited supply of sound that has enough energy over a constant period to be economical.
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