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    Construction & Electrical

    LED Series Resistor Calculator

    LED Series Resistor Calculator performs a browser-local calculation using measurements and quantities you control. The results are presented as labelled figures so each number is easy to interpret. For low-power DC LED strings only; do not replace certified LED drivers.

    MAKE IT SIMPLE
    Formula assumptions and scope

    For low-power DC LED strings only; do not replace certified LED drivers.

    Result

    Worked examples

    DC supply voltage (V): 12, LED forward V: 2, LEDs in series: 3, Target current (mA): 20

    Resistor voltage drop: 6 V

    Using these sample input values gives the first labelled output above. For low-power DC LED strings only; do not replace certified LED drivers.

    Questions & answers

    Can I use the default numbers for purchasing or safety certification?

    No. Replace the examples with your real values. For low-power DC LED strings only; do not replace certified LED drivers.

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