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While the standard form of a twin-T filter isn't a band-pass, it's a band-reject, it can have a very high Q. I'm (almost) sure some clever person can find the right combination of terminals to yield a bandpass. Now if you limit your design to ladder networks, the proof might be possible. I have a vague recollection of a proof that you can't have coincident poles in a passive RC ladder network (but I could be wrong about that, it's been a long time...).
It can have a very deep null, but as a passive network it isn't resonant. If you want a twin-T notch filter to be resonant then you need to use it as part of an active filter.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
innews:SPednY_R0pRPY8vRnZ2dnUVZ snipped-for-privacy@web-ster.com:
So you are just a troll.
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