1_kHz_STATE_VARlABLE

Published:2009/7/2 23:20:00 Author:May | From:SeekIC

Circuit using three 741 opamps offers low sensitivity, voltage-controlled tuning, and easy conversion to high pass or bandpass. For high pass, take output from first opamp. For bandpass, take output from second opamp. To increase frequency, change 10K resistors to identical higher values. 10:1 resistance change produces 10:1 frequency change. Damping d is adjustable; critical value of 1.414 gives maximum flatness of response without overshoot. Design equations are given.-D. Lancaster, Active-Filter Cookbook, Howard W.Sams,Indianapolis, IN, 1975, p129-135.



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