> Unfortunately, at a quick glance, it doesn't look like any of the
> three options you chose are really intended for SMPS applications
> but rather EMI suppression. Depending on additional characteristics
> which are not in the quick descriptions I saw, they may also be
> acceptable for SMPS

FWIW, I buy these powdered iron toroids, similarly described

http://www.jaycar.co.nz/productView.asp?ID=3DLO1242&keywords=3Dtoroid&form=
=3DKEYWORD

I wind in the 50-400uH range and they seem to work well
enough with an MC34063 at 35kHz. Going by colour alone,
they look like (and perform like) those I've scavenged from
commercial SMPS and re-wound. They are also specified
by part number in various magazine constructional articles, so
I presume the authors of those articles consider them OK for
SMPS

Joe=20

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.