A magnetic sphere immersed in oil placed at the center of a coil and influenced by magnets moved by a fan, wind electricity is produced.
materials:

• 19mm Neodymium sphere
• 2 discs neodymium 24mm
• Copper wire
• 12 led
• rectifier bridge
• 10v capacitor 330uf

http://www.youtube.com/watch?v=LUw96JUKI30
la ventola è stata scaricata da http://www.thingiverse.com/thing:56542
to wrap the copper I used this winder http://www.thingiverse.com/thing:100648