ACTIVE_ADJUSTABLE_BANDPASS_AUDIO_FILTER

Published:2009/7/14 3:49:00 Author:May | From:SeekIC

Has Butterworth attenuation characteristics and 42 db/octave cutoff slopes. Output is 50 v rms with low distortion, and dynamic range over 100 db. Second-order harmonic distortion is reduced by operating tube heaters at low voltage. Seven elements are varied simultaneously by switching different resistor and capacitor values to change cutoff frequencies. Article has three tables giving these values for high-pass cutoffs from 16 to 16,200 cps and low- pass cutoffs from 20 to 20,000 cps.-J. R. MacDonald, Active Bandpass Filter has Sharp Cutoff, Electronics, 31:33, p 84-87.



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