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Does the resistor need to go before the LED? - YouTube
Guide to LEDs and resistors
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Series LED Resistor Calculator - Engineering Calculators & Tools
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Driving an LED with resistor directly from 3.3v GPIO pin of a microcontroller - Electrical Engineering Stack Exchange
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LED circuit - Wikipedia
LED Resistor Calculator
LED Resistor Calculator
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Do I still need a resistor in this LED series design? - Electrical Engineering Stack Exchange
Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
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How to calculate the series resistor for an LED – Stompville
Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
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