4 bits adder

[b][red]This message was edited by the Bug_Master at 2002-5-13 17:14:43[/red][/b][hr]
Hi, i'm a student and i heve to make a 4 bits adder/subtractor with a 74LS83 IC i already made this but my problem is that i have to show the result in 2 7 segment display, and i'm having trouble with this because one display, when the result it's greater than 9, i can't make them to do the rigth counting like 10,11,... i'm using a 74ls83, 74ls248, and some basic gates. i've the scheme that i made in circuit maker, if anyone like to take a look, i apreciate.

Just one more question to wire the display i have to use a resistor in the vcc or in data in?

thanks in advance,
Bug_


Comments

  • : [b][red]This message was edited by the Bug_Master at 2002-5-13 17:14:43[/red][/b][hr]
    : Hi, i'm a student and i heve to make a 4 bits adder/subtractor with a 74LS83 IC i already made this but my problem is that i have to show the result in 2 7 segment display, and i'm having trouble with this because one display, when the result it's greater than 9, i can't make them to do the rigth counting like 10,11,... i'm using a 74ls83, 74ls248, and some basic gates. i've the scheme that i made in circuit maker, if anyone like to take a look, i apreciate.
    :
    : Just one more question to wire the display i have to use a resistor in the vcc or in data in?
    :
    : thanks in advance,
    : Bug_
    :
    Hi,

    I like to look at your scheme you can`t send it to [email protected]

    The resistors must be wired by the data in.

    Bye

  • : [b][red]This message was edited by the Bug_Master at 2002-5-13 17:14:43[/red][/b][hr]
    : Hi, i'm a student and i heve to make a 4 bits adder/subtractor with a 74LS83 IC i already made this but my problem is that i have to show the result in 2 7 segment display, and i'm having trouble with this because one display, when the result it's greater than 9, i can't make them to do the rigth counting like 10,11,... i'm using a 74ls83, 74ls248, and some basic gates. i've the scheme that i made in circuit maker, if anyone like to take a look, i apreciate.
    :
    : Just one more question to wire the display i have to use a resistor in the vcc or in data in?
    :
    : thanks in advance,
    : Bug_
    :
    Hi,

    I like to look at your scheme you can`t send it to [email protected]

    The resistors must be wired by the data in.

    Bye

  • Ok, i forgot that i have to make the sum of the carry's to make the result from 0 to 30, but in the meanwhile i just can't figure how can i make the subtraction when the result it's negative.

    Thanks,
    Bug_
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