john.brewer@us.schneider-electric.com wrote:
> I am looking for a ferrite rod to wind a filament choke on. Does anyone know
> a source for small
> qty? Needs to be about4 1/2 to 5" long.
I forgot to mention one other available possibility. Digikey and
other vendors sell pairs of flat ferrite rectangular blocks that are
intended to be clam shelled around ribbon cable. If you add a spacer
to the mating faces, they make nice, compact and mostly self shielding
inductors. This works especially well if you wind the wires around a
pair that have the mating surfaces facing outward, put spacers on all
4 mating surfaces and sandwich between another pair. They are made up
to about 3 inches of length and an inch wide. The gap spacers provide
the DC saturation resistance.
Here is the Digikey catalog page that shows a big list of these cores:
http://dkc3.digikey.com/PDF/T061/0999.pdf The 28 material is the
stuff good for up to about 10 MHz, high Q coils.
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