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LED resistor value

Discussion in 'LEDs and Optoelectronics' started by glewis721, Apr 30, 2013.

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  1. glewis721


    Apr 30, 2013
    if i am using 3.3 volts and a 1.5 volt LED, what value resistor should i use? (i don't know how much 1 ohm reduces the voltage):confused::confused::confused:
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    The answer is 90 ohms (get a 100 ohm resistor).

    This assumes you want 20mA through the diode (which is a typical maximum value) and that the resat of the figures you've given are accurate.

    Click on the "tutorials" link above and look for the one on LEDs. There's lots of background material and also links to calculators that will assist you in doing the calculations yourself.
  3. glewis721


    Apr 30, 2013
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