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-   -   need help wana change 60-Hz twin-T notch filter to 279 Hz filter (http://www.diyaudio.com/forums/solid-state/117142-need-help-wana-change-60-hz-twin-t-notch-filter-279-hz-filter.html)

prorms 10th February 2008 12:38 AM

need help wana change 60-Hz twin-T notch filter to 279 Hz filter
 
the twin-T 60-Hz notch filter work extremly well but i also need one for 279 hz or close to it were i keep getting it wrong is the band width wrong .the 60 hz twin-T notchfilter-60 db which can adjusted in r5


schematic

http://focus.ti.com/lit/an/slyt145/slyt145.pdf

http://www.radio-electronics.com/info/circuits/rc_notch_filter/twin_t_notch_filter.php

math f/c =1 /( 3.142 *r1 *c1*2)

r3=1/2 r1
c3=2*c1

:smash:


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