I think he means a Band Stop Filter, a Band Reject Filter.What's BSF?
You could built a Sallen-Key active filter using a BJT emitter-follower in place of the usual unity-gain op amp, (with perhaps some small reduction in its performance).
You can cascade a low-pass filter followed by a high-pass filter to get the bandpass.
Google Sallen-Key filter.
(A nit, but I find it difficult to take a technical post seriously when it contains the word "wanna". )
I have used an NPN emitter-follower driving a PNP emitter-follower to reduce the offset to a low value.Both bipolar transistors and FETs can be used successfully, although it does lead to an offset voltage of Vbe of Vgs.
It that's true, than the TS can consider the Twin-T filter.I think he means a Band Stop Filter, a Band Reject Filter.
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