Published:2009/7/2 23:24:00 Author:May | From:SeekIC
High-Q active bandpass filter can be adjusted over wide frequency range (100:1) while maintaining Q essentially constant over 100. Two-phase output is available. Opamps can be 741 or equivalent. Cascaded all-pass networks B and C each have 0 to 180° phase variation and unity gain at all frequencies, These are driven by opamp A whose feedback signal is sum of input and output of all-pass networks.R2 adjusts Q,andganged log pots change center frequency,-J.M.worley,Variable Band-Pass Filter, Wireless World,April 1977,p 61.
Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Filter_Circuit/20_2000Hz_VARIABLE_BANDPASS.html
Print this Page | Comments | Reading(3)
Code: