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LED Resistor Calculator
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Characteristic voltage drop
Light-Emitting Diodes (LEDs) - SparkFun Learn
![LED Voltage Drop by Color [Chart by Electrical Engineering XYZ]](https://www.electricalengineering.xyz/wp-content/uploads/2020/01/led-voltage-drop-chart-voltage-by-color.jpg "LED Voltage Drop by Color [Chart by Electrical Engineering XYZ]")