MAKE Presents: The LED
Take a tour through the world of the light-emitting diode (LED) and learn who invented it, how to use it, and how to make your own.
more Make presents:
The Resistor
http://www.youtube.com/watch?v=VPVoY1QROMg
The Capacitor –
http://www.youtube.com/watch?v=ZYH9dGl4gUE
audio & video by Collin Cunningham
Makezine.com