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Multicolor led with 2 pins

Discussion in 'Electronic Design' started by [email protected], Oct 2, 2007.

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  1. Guest

    Hi,

    I break a multicolor night light and find that it has only one radial
    led but it is multicolor (red, blue,) and of 2 pins. How to do that?
    Do anyone see similar design or LED before? The night light turns its
    color gradually from red to green and to blue and then recycle. Is it
    used different voltages to control the colors?

    Thanks!
     
  2. Back-to-back leds, with reverse polarity to each other. In your case, one
    polarity is red, the other blue. If you use AC (with PWM), you can create
    various other colours.

    Quite commonly available. Even from our plain enthusiast stores here in
    Australia, they're available in both flavours (two and three pin).

    This works because leds in reverse polarity behave "sorta like" 5v zener
    diods. Since forward bias is 2-3v, you'll never come across problems.
     
  3. default

    default Guest

    To get red blue green you need a RGB diode.

    There is a two lead novelty diode with tricolor leds built into a
    standard 5mm led package.

    LED1081
    T1-3/4 Flashing RGB LED LED1081
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    Detailed Description
    This RGB flashing LED is a winner. Apply 4.5Vdc, 90mA and let the fun
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    leave it connected, the LED goes through a multitude of flashing,
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    Display your own personal "light show". The flashing rate, at start
    up, is 1.4 times per second(1.4Hz). Let your mind run wild and figure
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    http://docs.bgmicro.com/pdf/page12.pdf
    http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=10895
     
  4. Jamie

    Jamie Guest

    Reverse the polarity.
     
  5. Gary Tait

    Gary Tait Guest

    wrote in @w3g2000hsg.googlegroups.com:
    It uses constant voltage/current to the package for power. There is a chip
    in the package that does the color cycling and LED driving. There is no
    way to conrtol what LEDS in the module to light.
     
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