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It is also called band-elimination, band-reject, or notch filters which passes all frequencies above and below a particular range set by the component.
Twin-T Band-stop filter
The low-pass filter section is comprised of R1, R2, and C1 in a “T” configuration. The high-pass filter section is comprised of C2, C3, and R3 in a “T” configuration .Hence it is commonly known as a “Twin-T” filter
A band-stop filter screens out frequencies with in a certain range and thus provides easy way to frequency outside that range. Also known as band-elimination, band-reject, or notch filters.
It can be built by placing a low-pass filter in parallel with a high-pass filter. Both the low-pass and high-pass filter sections are of the “T” configuration, giving the name “Twin-T” to the band-stop combination.
The frequency of maximum attenuation is called the notch frequency.