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[CGS2510.SEP.STUDENT.UCA at CUB.UCA.EDU]

The National filter blocks have much appeal but are not the only 
place to get nice filters.  Linear Technology has some super filters 
that are similar.  They have excellent s/n and are very versatile.  
Like routing +V to different pins selects different common responses 
(linear phase, sharpest cutoff, Bessel, etc.)  They are also quite 
high order (8th order).  I have never used one but they might be also 
worth looking into.