It's rather 0.1 µF = 100 nF.
RC of R1C1 should be in the same range as R3*C2 ( giving you a gain of about 10 ).
And I bet R1 = 470k (if you have it available anyway) would work the same as the proposed 487k
It's rather 0.1 µF = 100 nF.
RC of R1C1 should be in the same range as R3*C2 ( giving you a gain of about 10 ).
And I bet R1 = 470k (if you have it available anyway) would work the same as the proposed 487k