🚀 go-pugleaf

In article <C0HuEE.DAH@usenet.ucs.indiana.edu> ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:
>Hmm.. I thought it was simply sintered iron. Interesting to find out
>what this stuff is after all this while.

You're probably thinking of iron powder toroid cores, which are distinct
from ferrite cores, although they look the same and are used similarly.
Ferrite have higher permeability but saturate more readily, and are
generally used in low power applications.

>How big do these get? I need a toroid about an inch and a half in 
>diameter to make an inductor for a power panel I am building.

From a Palomar Engineers brochure:
F-140 ferrite cores:	OD 1.40"	ID 0.90"	HT 0.50"
    inductance 45-2250 mH/1000 turns, depending on the type of ferrite
    mix.  $4.50
T-157 iron powder core:	OD 1.57"	ID 0.95"	HT 0.57"
    inductance 115-970 uH/100 turns, depending on the mix.  This size
    is rated for 250W for mix 2 (0.25-10 MHz).  $4.00

Palomar's sizes go up to F-240 and T-400, but I've seen larger.  I don't
mean to endorse Palomar, but it's the only brochure I've got handy.
    Palomar Engineers
    P.O. Box 455
    Escondido, CA   92025
    (619) 747-3343
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>-- 
>-------------------------------------------------------------------------------
>Iskandar Taib                          | The only thing worse than Peach ala
>Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
>Bitnet:   NTAIB@IUBACS                 !


-- 
Steve Brown, N8HFI              sbbrown@magnus.acs.ohio-state.edu
Chief Engineer, The Ohio State University Radio Observatory ("Big Ear")