So when i designed the filter boards one thing i took into consideration was that often you need to use multiple caps to get close to the value required. Now when i first started home brewing, i used to obsess about values, oh i dont have this value, oh i dont have that value, but now i really do not give a crap, as long as its in the ball park she’ll be right mate, mostly the values are not super critical as long as they are ball park.
I mean does it really matter if the corner frequency of a LPF is shifted up or down a few 10’s of Hz, or Khz for that matter because your cap values are 5% off ideal? I am using 10% caps as it is, so there can be a bloody lot of variation here. But I did manage to get pretty close to the numbers using the one range of MLCC caps that minikits.com.au most of which are also NP0 types also. So below are the schematics for the filters.
