This calculator requires the use of Javascript enabled and capable browsers. A question that often comes up in projects using LEDs is "what resistor should I use with my LED?" This calculator helps determine that for you. Enter the data required for Supply Battery Voltage in the range of 3 to 24 volts, the Diode Forward Voltage in the range of 2 to 4 volts, and the Diode Rated Current in the range of 10 to 50 milliamps (mA). Click on Calculate for the results which assume for power calculations, the use of the standard value current-limiting resistor indicated. This calculator rounds the resistance up to the next standard resistor value. You should actually be able to buy a common 5% resistor with the value returned by the calculator. For more detailed LED information visit these two sites, which have good information and lead to others also; here . For identification purposes, the negative side of the LED is the flat side and the shorter lead.
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