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10th February 2008, 12:38 AM
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diyAudio Member
Join Date: Nov 2006
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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 
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