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Build a filter that will accept a 200hz square wave

  1. Apr 21, 2005 #1
    i need to build a filter that will accept a 200hz square wave that will remove all harmonics other than the fundamental. there also needs to be an option to pass or block the dc value in the circuit. i understand the how to make the filter, but not the part about how i would have an option with the dc. how would i do this?
     
  2. jcsd
  3. Apr 21, 2005 #2
    Add another LP filter as shown. You did not specify a response time, so you'll have to calculate the R and C. A sufficiently low-pass filter will pass the DC component with some ripple that you must define as acceptable. Its a trade-off between response time and AC ripple.

    https://www.physicsforums.com/attachment.php?attachmentid=3256&stc=1
     

    Attached Files:

  4. Apr 21, 2005 #3
    Just reread your post. Do you want:

    1) The AC component only with an option to pass the AC + DC

    or

    2) The AC component only with an option to eliminate the AC and pass just the DC component?
     
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