A useful property of Pleiades filters is that if 2 are connected one after the other the new cut off frequency is the sum of their cut off frequencies.
( Using the known relation for 2 inductors in parallel: 1/L=1/L1 + 1/L2 )
f = R / ( 2 x PI x L ) ==>
f = R / (2 x PI) x 1/L ==>
f = R / (2 x PI ) x (1/L1 + 1/L2) ==>
f = R / (2 x PI x L1) + R / (2 x PI x L2) ==>
f = f1 + f2
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