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tri state diode

Discussion in 'Electronic Design' started by Tuurbo46, Sep 23, 2004.

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  1. Tuurbo46

    Tuurbo46 Guest

    Hi

    Whats the foward voltage drop across a tri state LED diode. I know a
    coventional LED is 1.2v. Also im currently working in Proteus ISIS
    schematic program and i cant find the part in the libary. Is it best
    represented by 3 LED's in series.

    Cheers Turbo
     
  2. What exactly is a "tri-state diode"? Do you mean a bipolar dual-color
    LED?

    AFAIK, no (visible) LEDs have typical voltage drop as low as 1.2V at
    reasonable operating currents. More like 1.6 to 3.2V, depending on LED
    color, LED type, and operating current.

    Best regards,
    Spehro Pefhany
     
  3. John Fields

    John Fields Guest

    ---
    Is that a question.

    A tri-state LED is two LEDs in the same lamp connected in either
    series aiding or series opposition or in parallel opposition:

    Series aiding:

    +>--[LED>]--+
    |
    COM>--------+
    |
    ->--[<LED]--+


    Series opposed:

    +>--[LED>]--+
    |
    COM>--------+
    |
    +>--[LED>]--+


    Parallel opposed:

    +--[LED>]--+
    | |
    +/->---+--[<LED]--+
    |
    -/+>--------------+

    The voltage drop across each LED will vary, basically, depending on
    the color of the light it emits.
     

  4. Your first two have 4 possible 'states', if you count 'off'.

    Best regards,
    Spehro Pefhany
     
  5. John Fields

    John Fields Guest

    ---
    State 1 = color 1

    State 2 = color 2

    State 3 = color 1 and color 2. For the series cases, DC will do it.
    For the parallel case, polarity reversals faster than the persistence
    of vision will.
     
  6. How fast does your persistence reverse?

    Best regards,
    Spehro Pefhany
     
  7. I read in sci.electronics.design that Spehro Pefhany <[email protected]
    It depends on how loudly she screams. (;-)
     
  8. John Fields

    John Fields Guest


    .... polarity reversals faster than vision will be able to follow.

    Better?
     
  9. John Fields

    John Fields Guest

     
  10. <LOL>

    Best regards,
    Spehro Pefhany
     
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