Will the LED be ON or OFF in this circuit?

Discussion in 'Homework Help' started by physicschick, Nov 29, 2009.

  1. physicschick

    Thread Starter New Member

    Nov 29, 2009
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    Here is the ciruit. It's a D flip flop. After reset is applied, will the LED be ON or OFF. Explain your answer.

    The answer is ON but I don't know why. So, I just need some explaination on this answer. Thanks:)
    [​IMG]
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Here is a page on a 4000-series CMOS 4013 dual D-type flip-flop:
    http://www.doctronics.co.uk/4013.htm

    If you read through it carefully, you shall find your answer.

    It's important to understand how they work.
     
  3. physicschick

    Thread Starter New Member

    Nov 29, 2009
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    thanks for the quick response! Is it because RESET makes everything a 0 which makes Q a 0 and Q' a 1?
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Reset makes Q=0. So, what will Q' be?

    Answer that, and you will have your answer.
     
  5. physicschick

    Thread Starter New Member

    Nov 29, 2009
    4
    0
    got it! thanks
     
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