Big 7 seg LED display


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  1. #1
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    Do a little search for Level Translator.

    You will find some Transistor, CMOS, etc etc circuits for that.
    Steve

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    There's no problem, only learning opportunities.

  2. #2
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    A concept as below could work, I think.

    It is just a concept though. Can be modified for anode / cathode path.
    You will need 8-transistors + 4 for the common ones.
    ULN type of drivers could be handy here, but you need to make use of them with respect to anode/cathode issue.



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    Last edited by sayzer; - 16th October 2006 at 19:09.
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  3. #3
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    This will not work.
    The transistor will work as a emittorfolower and the voltage on the emittor will not come over 4,3 volt.

  4. #4
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    While I was editing the concept, mat posted.

    How is it now?
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte

  5. #5
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    Nope ! or i have some doubt...
    Steve

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  6. #6
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    The schena above is still not ok.
    Her an example how it should work.

    From Darrel:
    Mat, the file caused an error in vBulletin due the the filename "div. voltages.GIF". Can you try again?
    Last edited by Darrel Taylor; - 17th October 2006 at 18:19. Reason: Bad filename

  7. #7
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    Question

    Thanks for your replies everyone..
    Is there any logic level convertion IC that can do this???

    Sayzer, your idea for the a,b,c,etc segments is using NPN transistors is what i had in mind.
    If i feed the output of the pic to a 4011 (AND gate with its both inputs made 1 common),
    and then give it to a PNP transistor, will it work???
    I think the AND gate will do the level conversion, i'm not sure ? ! ?
    Last edited by shahidali55; - 17th October 2006 at 18:15.

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