DC Choke for power supply

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Hi,
I am a bit of a newbie as far as chokes are concerned.
An air cored choke does not saturate. Imagine the gap = ring of iron. Big disadvantage of air cored is very large size and high resistance = very high cost.
how about a large diameter cylindrical ferrite core to increase the inductance? gap = the part of the ring that is missing.
 
I will Use DC Choke with power supply amplifier. It use current 3-5 Amp. I saw the power supply of Amplifier use DC Choke as attach file. I think, It will good than with out DC choke.(I'm not sure!!!)

:whazzat:
 

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