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Anyone out there know of a good resource for filter design? (And yes, I did already wikipedia it)? Answered

For an upcoming project I need to design a 3rd-order LP Butterworth Circuit, which is something I haven't done in quite awhile. I was wondering if anyone out there had a good online resource where I could go and refresh my knowledge of circuit design. I checked wikipedia, which was a good start, but was hoping for a more expansive coverage of the subject. Thanks, Purduecer


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