LED color

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  • nethajireddy
    New Member
    • Feb 2007
    • 83

    LED color

    Hi,
    I have one doubt regarding LED that is how same led changes its color green to orange like that, best example is Monoitor LED.
  • JosAH
    Recognized Expert MVP
    • Mar 2007
    • 11453

    #2
    Originally posted by nethajireddy
    Hi,
    I have one doubt regarding LED that is how same led changes its color green to orange like that, best example is Monoitor LED.
    Those 'bi-colored leds' are two leds essentially where only one at the time emits
    light; you can turn them into tri-colored leds by switching their states alternately
    very quickly but you'll need a bit of additional circuitry then.

    kind regards,

    Jos

    Comment

    • YarrOfDoom
      Recognized Expert Top Contributor
      • Aug 2007
      • 1243

      #3
      But why does the color change then if you switch the poles?

      Comment

      • JosAH
        Recognized Expert MVP
        • Mar 2007
        • 11453

        #4
        Originally posted by YarrOfDoom
        But why does the color change then if you switch the poles?
        They're diodes remember? They're mounted in opposite direction so at most one
        of them conducts; the other blocks the current and vice versa.

        kind regards,

        Jos

        Comment

        • debasisdas
          Recognized Expert Expert
          • Dec 2006
          • 8119

          #5
          Originally posted by JosAH
          They're diodes remember? They're mounted in opposite direction so at most one
          of them conducts; the other blocks the current and vice versa.

          kind regards,

          Jos
          as usual , i again learned something new today.

          Comment

          • YarrOfDoom
            Recognized Expert Top Contributor
            • Aug 2007
            • 1243

            #6
            Originally posted by JosAH
            They're diodes remember? They're mounted in opposite direction so at most one
            of them conducts; the other blocks the current and vice versa.

            kind regards,

            Jos
            Right, forgot about that. Only saw it a couple of month ago in physics class though.

            Comment

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