Black Box Indicator LED help

Discussion in 'The Projects Forum' started by MrJojo, Jun 19, 2013.

  1. MrJojo

    Thread Starter Member

    Jan 23, 2013
    45
    0
    Hello,

    I'm creating a black box with a few power supplies and an Ethernet connector. I want to be able to make sure when I turn power on, an indicator will turn on. I was thinking about having 3 LEDs, 1 for each power supply (48V, 5V, and 12V). I found out that my LED's "turn on" around 15mA, but they look very weak. I was going to put in a current limiting resistor for each LEDs power supply so once the power supply reaches it's proper voltage, the LEDs would turn on.

    I was wondering if there is a better way to do this and if there was a way to make the LED brighter.

    In all honesty, I think I'm over complicating things by trying to find the "turn on current" for the LEDs and should just put in a resistor that gives 25 mA. I just want to make sure that the power supplies are outputting the proper voltages.

    Thanks,
    Matt
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    more current = brighter LED.. Its as simple as that.
    Just use the proper resistor value to achieve 20-25mA supply and move on IMO.. (assuming they are "typical" 20mA LED's)
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,452
    3,371
    LEDs are not the same brightness.
    I have some blue LEDs that are super bright at 10mA.
     
  4. MrJojo

    Thread Starter Member

    Jan 23, 2013
    45
    0
    Ya, thats what I figured. Thought I was severely over analyzing my situation.
     
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