Super Digitally Tuned low Power active filter

This Super Digitally tuned low power active filter constant gain, constant Q, variable frequency filter provides simultaneous low-pass, bandpass, and high-pass outputs with the component values shown, the center frequency will be 235 Hz and 23.5 Hz for high and low logic inputs. Respectively, Q = 100, and gain = 100.

 Super Digitally tuned low power active filter Circuit Diagram