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Light emitting diodes, commonly called LEDs,
are real unsung heroes in the electronics world. They do dozens of
different jobs and are found in all kinds of devices. Basically, LEDs
are just tiny light bulbs but unlike ordinary incandescent
bulbs, they don't have a filament that will burn out and they don't
get especially hot. They are illuminated solely by the movement of
electrons in a semiconductor
material,
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