Re: gdt

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Hydrogen18" <hydrogen18-at-bellsouth-dot-net> 

Certainly, but it is a bit tricky. Most truly ferrite toroids I find are
black, and maybe a little glossy. They have a slight powdery texture to
them. Powdered iron cores are painted colors(although ferrites could be I
guess, but most arent)and have a very matte or shiny finish on the paint.
Iron powder cores seem more delicate and brittle. If you recover a toroid
from somewhere and want my opinion on it, you can just email me the picture.

---Eric
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, July 13, 2004 6:38 AM
Subject: Re: gdt


 > Original poster: David Speck <dave-at-davidspeckmd-dot-org>
 >
 > Eric,
 > Any simple way to distinguish a powdered iron from a ferrite toroid core?
 > Dave
 >
 > >A lot of cheap power supplies have ferrite transformers, but have iron
powder
 > >toroids for filtering.
 >
 >
 >
 >
 >