comparator

Discussion in 'General Electronics Chat' started by shivashankari.c14, Apr 6, 2010.

  1. shivashankari.c14

    Thread Starter New Member

    Apr 6, 2010
    10
    0
    hi will comparator compare ac signal wit dc signal?i need one circuit which compares ac signal wit dc ref voltage and it must produce output 1 if its voltage s higher than the ref voltage r else it must produce 0 output.


    thank u
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    It might be able to. Tell us more about the AC signal - how large is it, peak to peak?
     
  3. ifixit

    Distinguished Member

    Nov 20, 2008
    639
    108
    1. Rectify and filter the AC signal first to get a DC equivilent of the peak AC value. Use resistors to scale down to an average value, or an RMS value (if the AC is a regular shape) as required.
    2. Now compare the two DC levels using a comparator.
    Regards,
    Ifixit
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Ifixit, I think you misunderstood or misread our OP's problem statement.
     
  5. Engr

    Member

    Mar 17, 2010
    114
    5
    Is the 1 and 0 logic levels? Here is a sample circuit using a comparator. The reference voltage is 0V/ GND. While the AC signal is greater than 0V/ GND the output will always be 12V. Other than that it will be 0V.
     
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