1_kHz_VARIABLE_GAIN_STATE_VARIABLE

Published:2009/7/2 9:23:00 Author:May | From:SeekIC

Damping signal is inverted with fourth opamp to make gain and damping as well as frequency independently adjustable. Damping is in range of 0-2, with critical value of 1.414 giving flattest response. For high pass, take output from first opamp; for bandpass, take output from second opamp. Value of input resistor is 10K (10,000 ohms) when gain K is 1.-D. Lancaster, Active- Filter Cookbook, Howard W. Sams, Indianapolis, IN, 1975, p 135-136.



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