demorgan problems

Discussion in 'Homework Help' started by eduk, Dec 7, 2005.

  1. eduk

    Thread Starter New Member

    Dec 7, 2005
    1
    0
    hi there i am quite reforumlating this into demorgans law thanks in advance
    (All INVERTED)
    (a inverted) (b inverted) (c inverted) (none inverted) - -
    A.B.C + A.B.C + A.B.C + A.B.C

    thanks its for a 3 input alarm. If 2 or more inputs and on then the output is on

    thanks ed
     
  2. kantgetslicker17

    New Member

    Dec 7, 2005
    6
    0
    Could you make it more clear which one is inverted?
     
  3. kantgetslicker17

    New Member

    Dec 7, 2005
    6
    0
    [attachmentid=1021] I'm Assuming this is what you want whenever there's 2 input on, output is high.

    [attachmentid=1023] This is the answer I have for you, just learned in my class 2 days ago.
     
  4. kantgetslicker17

    New Member

    Dec 7, 2005
    6
    0
    Here's an explanation on how I got the answer:

    [attachmentid=1024] This is call K-Mapping which is covered in allaboutcircuits in Digital section.

    [attachmentid=1025] This is the output that you wanted. I place a 1 on 011,101,110, and 111. Then I had them all grouped up accordingly in pairs. So now we have 3 pairs.

    From there the answer is just simply: [attachmentid=1026]

    Lookup K-Mapping in Boulean Algebra in Digital.
     
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