DIY LEDs @ Popular Science « adafruit industries blog

DIY LEDs @ Popular Science

Greymatter Led 1
Greymatter Led 2
DIY LEDs @ Popular Science

The first light-emitting diodes went on sale in 1962, and you could have any kind you wanted as long as it was dim and red. Green, yellow and orange came next, but blue LEDs didn’t debut until 1989. So it may surprise you that the first LEDs, discovered in 1907, included blue—and were made of sandpaper.

And…


MAKE presents: The LED..

Filed under: EE — by adafruit, posted March 10, 2010 at 6:29 pm


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Prove you are human by reading this resistor:
0Ω+/- 5%

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0
1
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9

0
0
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5
5
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20

Match the sliders on the left to each color band on the resistor.

Click Here for a new resistor image.

New to electronics? Click here to learn how to read resistor values.

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