![](http://1.bp.blogspot.com/_IPGAOU6e58s/SOdib7QsHwI/AAAAAAAAADg/I0GkQtMOQ4o/s320/AD_filter_schematic.jpg)
![](http://1.bp.blogspot.com/_IPGAOU6e58s/SOdiDWwSSjI/AAAAAAAAADY/rdQmDCAnnMw/s320/AD_filter.jpg)
PW October 2008 and November 2008 had this article in it for an Active AF filter using the MAX 74xx chips. Now I get free samples of chips from MAX, AD and TI from time to time and I seem to remember having these so did a search and sure enough I do. So another project added to the build list.
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