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Thread: LED Voltage

  1. #1
    Gold Member Mr.Chips's Avatar
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    Question LED Voltage

    I'm using an old PC case as my control box and it has a few LED's on the front. Thought I might connect them to the various power sources so I could see if one wasn't on, or working.

    My question is what is the typical voltage to little LED's like these?

    I have 5V DC and 28V DC I would like to monitor. If this is too high of a voltage to apply to the LED's what size resistor would I need to drop the voltage down?

    Thanks


  2. #2
    Community Moderator Al_The_Man's Avatar
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    LED's are current operated devices, (forward biased diodes) you need a series resistor.
    A rough guide if you don't know the specs. is 330ohm for 5vdc and 1200 ohm for 24vdc.
    CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


  3. #3
    Gold Member Mr.Chips's Avatar
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    Quote Originally Posted by Al_The_Man View Post
    LED's are current operated devices, (forward biased diodes) you need a series resistor.
    A rough guide if you don't know the specs. is 330ohm for 5vdc and 1200 ohm for 24vdc.
    Thanks AL,

    I pick some up and give it a try.


  4. #4
    Community Moderator Al_The_Man's Avatar
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    BTW if you get the polarity wrong, it won't screw anything up, just that the LED won't light.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


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