Bandpass filter with adjustable Q

There has been interest in the past concerning filters with the property that some
parameter of the filter can be adjusted (with, say, a potentiometer) without peturbing
other parameters. The latest issue of Electronic Design magazine has such a design in the
Ideas for Design section.

http://www.elecdesign.com/Articles/ArticleID/10684/10684.html

I'm not sure but what I may have seen this one before, but I thought I'd call it to the
attention of the group.
.

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