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homemade ferrite torroid




My friend and I have been trying to wind a resonably efficient trans. 
but our efforts have been thwarted by the inavalability of a good core.  
All ye had was a peice of 3/8" steel.  So I decided to build a toriod.  
I rumaged around until I found some 16gauge galvanized steel wire.  
Basicly, I just wound it around into a circle and covered it 
w/electrical tape.  Has anyone built these before?  How do they compare 
to bought toroids, especialy in regard to rf chokes?

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