Build a filter that will accept a 200hz square wave

  • #1
zekester
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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?
 
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  • #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
 

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  • #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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