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Design a constant k low pass T and π section filters having cut-off frequency of 4KHz and nominal impedance of 500Ω.
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Solution:

fc=4kHzK=500Ω

L=Kπfc=500π×4×103=39.79mHC=1πfcK=1π×4×103×500=0.16μf

The , T the section consists of an inductor L/2 i.e 19.9mH in each series branch and a capacitor of 0.16μf in the shunt branch enter image description here

The π section consist of an inductor of 39.79 mH in series branch and a capacitor of c/2 i.é 0.08μf in each shunt branch.

enter image description here

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