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cheap choke design
5 feb 2002
i'd like to make an inexpensive 500 microhenry 100 amp 60 hz inductor
by winding some wire on a galvanized water pipe loop with an air gap. 

can anyone help me with the basics? what's the permeability of that kind
of steel. how can i avoid saturation? what should the gap width be? it
would be nice to be able to adjust the inductance. i'd like to spend as
little as possible on wire. it might be undersized, less than #2, with
some ts vs elbows and 1 or 2 legs of the square or rectangular loop
extended for cooling. cooling with water or oil might be interesting. 

thanks for your help,


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