Tristated output to two common Base transistor issue


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  1. #1
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    Thumbs up Bravo!

    I think I now understand clearly the difference between an electrician (me) and you clever engineers

    There's only one word to say: BRAVO!

    ... et merci 1000 fois.

    NB: somebody talked about a "simulator". Is it really possible to simulate an electronic circuit that matches reality? Also with PICs?
    Roger

  2. #2
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    Default

    Ok; I removed my post.
    Last edited by sayzer; - 10th September 2007 at 15:12. Reason: something was wrong with my design

  3. #3
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    Nice work on testing/verifying all the various circuits Luciano.

    I vote we keep this thread alive. I can't help but think there's
    a better way to do this with fewer discreet components, and
    even less quiescent current drain.

    Seeing all the various circuit ideas is very interesting.

    Maybe we should create a new topic category named Tips &
    Tricks for hardware/software solutions similar to the Microchip
    web forum & Tips & Tricks app-notes?

    These spark a lot of interesting ideas/approaches to doing things.
    Regards,

    -Bruce
    tech at rentron.com
    http://www.rentron.com

  4. #4
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    Talking

    Hi, Folks

    From the brainBoard ...

    Et c'est la France qui repasse en tète ...

    "The fingers in the nose" ... as we say here ...

    Alain

    PS : Tested ans Verified ... with 20 mA per Led ...
    Attached Files Attached Files
    Last edited by Acetronics2; - 11th September 2007 at 08:46.
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    IF there is the word "Problem" in your question ...
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  5. #5
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    Bravo, Alain!

    If you haven't seen it, here is Alain's tested circuit:

    <IMG SRC="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=2007&stc=1&d=118952080 6">

    (His PDF file is easier to read.)

    The input is at 2.75 VDC, eliminating the worry about a floating input pin when the input is set to high-Z.

    I think I mentioned the possibility of using MOSFETs several posts back. I was going to try it with Luciano's original circuit, something like this:

    <IMG SRC="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=2008&stc=1&d=118952090 8">

    Exchanging the positions of R6 with D1 and R5 with D2 in Alain's version will accomplish the same result, but without the voltage divider.
    Attached Images Attached Images   
    Last edited by RussMartin; - 11th September 2007 at 15:39.
    Russ
    N0EVC, xWB6ONT, xWN6ONT

    "Easy to use" is easy to say.

  6. #6
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    Quote Originally Posted by RussMartin View Post
    Exchanging the positions of R6 with D1 and R5 with D2 in Alain's version
    will accomplish the same result, but without the voltage divider.
    Hi Russ,

    This is not possible because on the original board made by Roger,
    the anode of one LED is connected to the cathode of the other LED.

    The purpose of the voltage divider was to keep the board as it is.
    (The voltage divider can be made by adding one wire to the board).



    Best regards,

    Luciano
    Last edited by Luciano; - 11th September 2007 at 23:11.

  7. #7
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    Talking

    Quote Originally Posted by Luciano View Post

    This is not possible because on the original board made by Roger,
    the anode of one LED is connected to the cathode of the other LED.

    Luciano
    Hi, Luciano

    In your great science, do you have an answer for that :

    " But why does always Roger make boards before thinking to how they should work ...??? "

    Will "Swiss precision" only be a legend ???

    LOL ...


    Hi, Roger ...

    Try to tell us about your Projects BEFORE heating the soldering Iron ...

    ... so much time saved !!!

    Just Jokin' ...

    Best Regards

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

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