Blue light LED works without any resistor and doesn't burn out. Why? - Electrical Engineering Stack Exchange
5mm blue LED + 12v Resistor
How do I calculate what resistors I need for RGB LEDs with 3.7V? - Electrical Engineering Stack Exchange
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5mm blue LED + 12v Resistor
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Choosing the Resistor to Use With LEDs : 3 Steps - Instructables
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UW-Madison MRSEC
