Pick an approximation and a cutoff; the R and C values are computed and rounded to the chosen E-series, then analysed below.
C1 and C2 are optional; when set, keep C1/C2 ≥ 4Q² / (1 + 4(K−1)Q²) (i.e. ≥ 4Q² at unity gain) so R1, R2 stay real.
Components: R1 = — R2 = — C1 = — C2 = — Ra = — Rb = —
Cutoff f0 = — Hz Q = — ζ = — passband gain K = —
Transfer function:
H(s) = —
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