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Thread: Can't figure out the resistor I need for an accent LED

  1. 08-20-2009, 09:30 AM #1
    ThreeQuadFive
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    Default Can't figure out the resistor I need for an accent LED

    Hi all.

    I bought a super white 5mm LED for use in a crystal chamber design I'm doing and can't for the life of me figure out the resistor i need...an online wizard say 120ohm 1/4watt resistor...but...???

    Intensity: 7000mcd
    FW current: 25ma
    FW supply: 3.3V typical, 3.6b max

    This is going into a setup with a 6v source.
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  2. 08-20-2009, 10:38 AM #2
    Jedi-Loreen
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    But what?

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  3. 08-20-2009, 11:37 AM #3
    Kal El Rah
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    345, if this is the calc. you used: http://led.linear1.org/1led.wiz?VS=6.0;VF=3.3;ID=25
    then it is correct, trust the calculator!

    You need a 120 ohm 1/8 watt, not 1/4 watt
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  4. 08-20-2009, 02:07 PM #4
    Jedi-Loreen
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    I didn't even know they made 1/8W resistors. 1/4W are probably easier to find, it's not going to make much difference to use one of those.
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