45Hz to 90 Hz Hum filter

The circuit filter the signal frequency between 45 Hz and 90 Hz.Adjust frequency from 45 Hz to 90 Hz by using RV1 and adjust band width by using RV2.
Part list :
C = 0.047uF x 3 ,10uF
R = 4.7K ,75K ,620K,2.2K ,100Kx2
RV1 = 20K
RV2 = 100 Ohm