I wrote
BTW Siemens make some torroidal cores down to 1mm
thick ferrite, slightly
larger
in other materials. RS Components stock some -
http://rswww.com/ and go in
through the catalogue: "Electronics",
"Transformers/Inductors/Ferrites",
"Ferrites", "Torroids" (sic). There are even data sheets but I
didn't manage
to
download them.
So it seems that RS and I made the same spelling mistake. I think "Toroid" and
"Toroidal" are the correct spellings...
P.