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Scratch Build – In Progress help building an ir led array

Discussion in 'Project Logs' started by donnybronson, 23 Apr 2009.

  1. donnybronson

    donnybronson What's a Dremel?

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    hi
    im looking for some help building an ir led array
    i have about 140 10mm IR leds to power and i need to be able to do it from batteries...

    hi
    im looking for some help building an ir led array

    i have about 140 10mm IR leds to power and i need to be able to do it from batteries

    the leds claim to have the following spec:

    RADIANT INTENSITY 6mW/Sr If=20m/a

    RADIANT INTENSITY 30 mW/Sr If=100m/a

    FORWARD VOLTAGE 1.4—1.45v

    REVERSE CURRENT 10u/a


    i tried running 48 from 2x pp3 batteries in series but the current draw killed the batteries pretty quick and their internal resistance caused them to get pretty hot...

    pretty much the same results running a string of just 6 with two pp3's in series powering them. though they did last a little longer

    at the mo i have sets of six leds in series

    i need a pretty portable solution that offers as the best possible brightness fron the arrays and needs lolast for about 1-2 hours


    so which batteries to use? how many leds to connect ? series/parralel? additional resistors?

    thanks in advence guys
     
  2. Sushi Warrior

    Sushi Warrior What's a Dremel?

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    Move this to the modding forum.
     
  3. donnybronson

    donnybronson What's a Dremel?

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    thanks for that will do
     
  4. riekmaharg2

    riekmaharg2 has started the PowerCore scratch build

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    Ill send you a visitor messages on your profile.
     

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