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Need differential Notch Filter 20hz

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MAKeller

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20hz filter circuits

Can anyone point me to a passive differential notch filter circuit?
Everything I have found on the net is for a single ended circuit.
I want to filter the telephone ringer on a digital answering machine.

Thanks Guys.

MAK
 

differential notch filter passive

Hi
You can design a differentiala notch filter use ANADIGM's FPAA ICs.
Very simple and free design software.
see
https://www.anadigm.com


ynhe
 

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