Free online program for designing several types of active filters, including low-pass, bandpass, and high-pass, with Bessel, Butterworth, Chebychev, inverse Chebychev, or elliptical passband responses. You can even choose the specific op-amp to use, or a
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, Added: Mar 8, 2004
http://www.chipcenter.com/oltu/afw/af.html
