- Published in issue 7/1994 on page 50
8th-order Butterworth filter
As usual in RC filter designs. resistors R1-R4 and R5-R8 are given equal values. Unfortunately, again as usual. This leads to rather awkward values of the capacitors. However, rounding off these values to the nearest E12 value leads to rippIes in the transfer characteristic. The specified component values give a cut-off frequency of 1 kHz.