What Are Resistors Used For? - dummies
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How to Install Load Resistors for LED Turn Signal Lights: - do-it-up.com
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Do I need a pull-up/down resistor for button LED circuit? : r/arduino
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What Resistor Do I Need For an LED | DigiKey Electronics
Why does every LED need a resitor - General Electronics - Arduino Forum
Resistors for LED Circuits | Resistor Applications | Resistor Guide
