Help please

Discussion in 'Homework Help' started by Ohms Law, Feb 2, 2008.

  1. Ohms Law

    Thread Starter Active Member

    Oct 14, 2007
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    Ok guy's i need some serious help i'm in the middle of learning boolean algebra of course the professor want slow down i need this term made out of nand gates only any help greatly apreciated (d c+b'ac+a'c') please note the commas mean not.
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    You need to post your try at an answer, and how you got it. You won't learn much if you are spoon-fed.
     
  3. Ohms Law

    Thread Starter Active Member

    Oct 14, 2007
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    Ok I know or think i'll need 3 nand gates for there is 3 terms but conecting them is where i get screwed up
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    That will get you the three products.
    Here's a big hint: I'll bet you have heard of DeMorgan's Theorem.
     
  5. Dave

    Retired Moderator

    Nov 17, 2003
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    Two further hints.

    1) If you tie the inputs of a 2-input NAND gate together you will get a NOT gate, therefore you have a means for getting the compliment of a variable.

    2) You can double NOT a function without changing it; i.e. A = NOT(NOT(A))

    Finally RonH is right, the big hint is DeMoran's Theorems.

    Here is an example of where I have shown someone before how to do this.

    Dave
     
  6. Ohms Law

    Thread Starter Active Member

    Oct 14, 2007
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    three nand gates 1 3 input 2 2 inputs 2 inverted i hope lol im trying do u know i have read all the info u guys gave me and the whole chapter on gates in my text book i feel i'm still not 100% sure but im trying thank u all so much for everything
     
  7. Ron H

    AAC Fanatic!

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    So how do you "connect" the 3 NAND gates?
     
  8. Dave

    Retired Moderator

    Nov 17, 2003
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    Can you scan in your working out? I would be happy to give you some feedback/pointers as to where you may, or may not, be going wrong.

    Dave
     
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