LED Resistor Calculation
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Resistors in Series and Parallel
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Understand resistors better than EVERYONE, a PRO guide to all common resistors.
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How to select Resistor Value for LED with simple calculation @TheElectricalGuy
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How to calculate the Protection Resistor for an LED Diode?
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How to Calculate the Correct Resistor for LEDs Light Emitting Diodes
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LED Circuit Design - How to design LED circuits
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Basic Electricity - Resistance and Ohm's law
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