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Thread: Cree star led help

  1. #1

    Default Cree star led help

    I'm getting started on my first lightsaber, and I ordered a cree star (royal blue) led to be used with a NB2 sound card. I haven't gotten the parts in yet so I can't do any data collection. Will a 4.7 ohm 0.5 watt resistor be enough for a simple system like this, or should I order a stronger resistor?

  2. #2

    Default

    Assuming you're using a 3.7V battery, that would be a much stronger resistor than you need. I suggest you take a look at this thread.

    Unless that's a typo and you meant .47ohm
    ERUDITION


    A Jedi uses the Force for knowledge and defense, never for attack.

  3. #3

    Default

    It was a typo. The resistor I'm looking at is a 0.47 ohm. As for the link, how would I find the forward voltage of my led?

  4. #4

    Default

    It's listed in the specifications of the LED in the store. (or you can look up the XP-E2 color datasheet) it's 3.41vf @ 1A
    ERUDITION


    A Jedi uses the Force for knowledge and defense, never for attack.

  5. #5

    Default

    Thank you. It's really good to see that experienced builders are willing to help novices

  6. #6

    Default

    Oh, don't go mistaking me for an experienced builder I'm just some guy.
    ERUDITION


    A Jedi uses the Force for knowledge and defense, never for attack.

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