The filter described here has an easily adjustable center frequency,symmetrical skirts and an attenuation (gain) of-40(+40)dB at an octave either side of the center frequency(fC). The filter Q (Q = fC/BW3dB ≅ 250) does not vary significantlywhen the center frequency is changed, thus, theshape of the skirts is essentially independent of the pot setting.This feature yields filters that can be adjusted over amuch wider frequency range than “T” type filters, the onlyother type of filter with such a deep notch or narrow bandpass.Now one filter type is useful in many designs. The calculationof the center frequency for the circuits shown inFigure 1 and Figure 2 is given in Equation 1 and Equation 2.
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