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  1. #1
    radnomguywfq3's Avatar
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    I just spent five hours building this...

    A 4 bit full adder circuit :O My very first useful digital circuit.

    The schematic is really messy, I didn't spend a lot of time making it neat, and it probably has a bit of mistakes when I translated the expressions over to the schematic.

    Really, it shouldn't take longer than 30 minutes to design this, I just haven't done it before so o.o

    Last edited by radnomguywfq3; 11-01-2012 at 01:03 AM.



    There are two types of tragedies in life. One is not getting what you want, the other is getting it.

    If you wake up at a different time in a different place, could you wake up as a different person?


  2. #2
    Dreamer's Avatar
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    Are you becoming a electronics engineer or something? Looks confusing to me.
    Resource Team: Feb/5/2012 - May/5/2012
    Middleman: April/25/2012 - September/16/12


  3. #3
    noob555's Avatar
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    what's the round line under the or gate?

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    Arhk's Avatar
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    Any type of engineering you do, you have to cover electricity stuff.
    ~
    "If the world hates you, keep in mind that it hated me first." John 15:18

    "True strength isn't determined by when a man has a lot and gives enough, but when he has nothing left but keeps on giving."
    "A man is determined by the strength of his will."
    "Courage has nothing to do with ascertaining any sense of certainty, but the will to go on even
    in the face of uncertainty." - Arhk



  5. #5
    Instrumental's Avatar
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    i think itz Boolean algebra and the structure seems like combination of AND, OR n NOR gates.
    not sure though.

  6. #6
    bowlcut's Avatar
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    It just looks like a ton of square penises.
    Seriously bro learn how to draw a straight line. You related to Michael J. Fox?

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  8. #7
    radnomguywfq3's Avatar
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    Quote Originally Posted by noob555 View Post
    what's the round line under the or gate?
    Its an XOR gate. Output is only high if one input and not the other is high.

    I can just give you the expression for schematic I derived from the truth tables if you want (if that is what you are trying to get from the schematic) :S

    CarryFlagOut = CarryFlagIn AND (Ax XOR Bx) OR (Ax AND Bx)
    Outx = Ax XOR Bx XOR CarryFlagIn

    I literally just repeat that logic for however many bits I want to add. Only because there is no carry for the first bit, I just use the same expression only with CarryFlagIn as zero and you get a simple XOR and AND gate.

    Quote Originally Posted by max620 View Post
    i think itz Boolean algebra and the structure seems like combination of AND, OR n NOR gates.
    not sure though.
    Yeah, it is boolean algebra, but those are XOR gates not NOR gates. NOR gates look like plain OR gates but with a negation bubble at the output.

    The next step is to put this into minecraft :O

    Quote Originally Posted by Arhk View Post
    Any type of engineering you do, you have to cover electricity stuff.
    ~
    Not sure about that. I doubt boolean algebra would be of any use to a civil engineer.

    Quote Originally Posted by Dreamer View Post
    Are you becoming a electronics engineer or something? Looks confusing to me.
    Yeah, atm I am studying Computer\Electrical Engineering.
    Last edited by radnomguywfq3; 11-01-2012 at 02:45 AM.



    There are two types of tragedies in life. One is not getting what you want, the other is getting it.

    If you wake up at a different time in a different place, could you wake up as a different person?


  9. #8
    Azathᴏth's Avatar
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    I will pretend to understand this schematic, apparently drawn by an ingenious 5 year old, and applaud your efforts.

  10. #9
    Ed's Avatar
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  11. #10
    Hux's Avatar
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    use a ruler man,
    looks like some smart stuff.

  12. #11
    The Reaper's Avatar
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    I'm currently studying in Electrical Enginering, and i dont even get anything on this scheme so use a ruler next time, and explain stuff.
    A.K.A Lilleanders
    Quote Originally Posted by Ghost View Post
    I would most likely get wood.

     







  13. #12
    Arhk's Avatar
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    Quote Originally Posted by Jetamay View Post

    Not sure about that. I doubt boolean algebra would be of any use to a civil engineer.



    Yeah, atm I am studying Computer\Electrical Engineering.
    At my school everyone had to do a semester on it.
    ~
    "If the world hates you, keep in mind that it hated me first." John 15:18

    "True strength isn't determined by when a man has a lot and gives enough, but when he has nothing left but keeps on giving."
    "A man is determined by the strength of his will."
    "Courage has nothing to do with ascertaining any sense of certainty, but the will to go on even
    in the face of uncertainty." - Arhk



  14. #13
    radnomguywfq3's Avatar
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    Quote Originally Posted by The Reaper View Post
    I'm currently studying in Electrical Enginering, and i dont even get anything on this scheme so use a ruler next time, and explain stuff.

    I already did, in my previous response to Noob555's post. And it isn't that bad. I mean sure, the lines aren't straight, but you can deduce expressions from this. The gates are quite distinctive.

    Designs for 4 bit full adders seem to be fairly consistent with each other, there really isn't much to explain other than to give the expressions I designed the circuit with.

    Its an XOR gate. Output is only high if one input and not the other is high.

    I can just give you the expression for schematic I derived from the truth tables if you want (if that is what you are trying to get from the schematic) :S

    CarryFlagOut = CarryFlagIn AND (Ax XOR Bx) OR (Ax AND Bx)
    Outx = Ax XOR Bx XOR CarryFlagIn

    I literally just repeat that logic for however many bits I want to add. Only because there is no carry for the first bit, I just use the same expression only with CarryFlagIn as zero and you get a simple XOR and AND gate.


    Last edited by radnomguywfq3; 11-01-2012 at 11:07 AM.



    There are two types of tragedies in life. One is not getting what you want, the other is getting it.

    If you wake up at a different time in a different place, could you wake up as a different person?


  15. #14
    noob555's Avatar
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    Quote Originally Posted by Jetamay View Post
    Its an XOR gate. Output is only high if one input and not the other is high.

    I can just give you the expression for schematic I derived from the truth tables if you want (if that is what you are trying to get from the schematic) :S

    CarryFlagOut = CarryFlagIn AND (Ax XOR Bx) OR (Ax AND Bx)
    Outx = Ax XOR Bx XOR CarryFlagIn

    I literally just repeat that logic for however many bits I want to add. Only because there is no carry for the first bit, I just use the same expression only with CarryFlagIn as zero and you get a simple XOR and AND gate.



    Yeah, it is boolean algebra, but those are XOR gates not NOR gates. NOR gates look like plain OR gates but with a negation bubble at the output.

    The next step is to put this into minecraft :O



    Not sure about that. I doubt boolean algebra would be of any use to a civil engineer.



    Yeah, atm I am studying Computer\Electrical Engineering.
    ohh
    Its a xor gate
    I'm taking a digital electronics class myself! It's interesting.

  16. #15
    Geomatrical the 7th's Avatar
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    Good job, theres some complex shit right there..

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