Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
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LED circuit and resistor recommendations - Electrical Engineering Stack Exchange
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automotive - I'm trying to use 3v LEDs in a 12V circuit, in my car - Electrical Engineering Stack Exchange
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How Does a 5mm LED Work? - LEDSupply Blog
LED Resistor Calculator
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Guide to LEDs and resistors
Resistance' of an LED | LEDnique
Choosing the Resistor to Use With LEDs : 3 Steps - Instructables
How to Calculate the Value of Resistor for LED & LED's Circuits
