#472

[@qwaqwa1960]

You'll get much higher Q by using precision components, or adjusting values. Extreme value sensitivity. That's the downside of the twin-T.

[@IMSAIGuy]

I agree. I think inductors also give higher Q. Is there any other topology I can concider using. All the audio circuits I looks at use T filters. sometimes in sallen key arrangements.

[@qwaqwa1960]

​@@IMSAIGuy I've rarely if ever used BP/notch filters, so...not the best person. Pretty sure there are S-K & MFB versions that are much less sensitive & more controllable. Actually, I suppose the state-variable is your best bet. Check out: www.edn.com/three-op-amp-state-variable-filter-perfects-the-notch/ www.google.com/search?client=safari&rls=en&q=site:edn.com+state+variable+notch+filter&ie=UTF-8&oe=UTF-8