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3.3v &3.3v LED how to connect 24V series circuit, how to calculate led series resistor, watts - YouTube
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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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Amazon.com: EDGELEC 100pcs 5mm White Lights LED Diodes Clear Round Lens 29mm Long Lead (DC 3V) +100pcs Resistors (for DC 6-12V) Included, Bright Bulb Lamps Light Emitting Diode : Industrial & Scientific
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