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An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as using a series resistor, or it can get more complicated, involving PWM and multiplexing.

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What material is used in the common 5mm LED?

I am not talking about the diode part of the LED, which is different depending on the color, what I am asking, is what is the material used in the conducting pins and the insulating cover? …
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