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Air cores and toriods and beads - inductor wrap up

Low power AM broadcasters use air coils and iron powder toroids to manage low frequency signals, FM broadcasters use ferrite toroids and beads to keep high frequency signals from running astray.
     Inductance hardware might be one of the most intimidating areas of low power broadcasting technology and information is scarce.
     The links below can help fill in the blanks:  
And, of course, our previous compendia:
Many of these links offer further readings so dig in and go as far as you like!

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