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Do you need a resistor for LEDs?

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Do you need a resistor for LEDs?

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Some LEDs such as colour changing LEDs, flashing LEDs and 5V LEDs are designed to run off a 5V supply and therefore don't need a resistor. All other standard and bright LEDs will need a current limit resistor. LED stands for Light Emitting Diode and as the name suggests, it is a diode that emits light.

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