- Joined Dec 28, 2021
I wanna create one, and share this on my school forum. The thing is, i cant find any circuit with explanation about its cut-off freq.
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.
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by Robert Keim