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Identifying Positive, Negative of LED unit

Discussion in 'LEDs and Optoelectronics' started by john2k, Apr 22, 2013.

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  1. john2k

    john2k

    176
    2
    Jun 13, 2012
    I have a car LED unit that goes on the side mirror. The unit has a 2 pin connector. Is there any way to determine which connector is positive and which is negative without randomly trying it and risking getting it wrong way round?

    Also, is there any way to determine if the unit has it's own internal current limiting resistors or a driver of some kind? If it doesnt, i dont want to feed power to it that's not driven or limited

    Thanks
     
  2. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    What DO you know about the LED? Forward voltage, operating current?

    Bob
     
  3. john2k

    john2k

    176
    2
    Jun 13, 2012
    :eek: NOTHING AT ALL (LOL)

    It's one of those indicator LED units that have lots of LED's inside.
     
  4. Rleo6965

    Rleo6965

    585
    9
    Jan 22, 2012
    If its really a unit. It's surely have a built in current limit resistor. Don't worry about the polarity. LED don't conduct or lit on reverse polarity.
     
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