help identifying toroid

zilog · 28th April 2007, 05:00 PM

I have an iron powder (methinks) toroid that's brand new. Problem is that I dont remember wherefrom it is, I got it off a friend long time ago.

The toroid measures 33x20x11mm, is black and has the text "52509 77550A7" stamped on it.

Help is very much appreciated!

Minion · 29th April 2007, 08:43 PM

well get your DMM out and measure it....I don"t think anyone here that will come over just to test your Torroid for you...

poynton · 29th April 2007, 09:40 PM

A photo would help......

zilog · 29th April 2007, 10:01 PM

It's black..

I have measured it, and Al= 28.06 nH/n^2, do you think it is safe to use it up to 0.8T assuming inductance does not drop too much given it is some kind of iron powder?

EDIT: wrong Al.

Conrad Hoffman · 29th April 2007, 10:01 PM

The number might be a house number, though it seems strangely familiar. I can't find it in my Arnold, Amidon, or Micrometals catalogs. If you have a way to measure inductance, it's not hard to wind a known number of turns on it, then calculate mu, then compare it with various catalog types for material. I do that with most of the surplus hamfest toroids I find. If you want to do that, I'll look up the formula.

28th April 2007, 05:00 PM	#1
zilog diyAudio Member Join Date: Oct 2005	help identifying toroid I have an iron powder (methinks) toroid that's brand new. Problem is that I dont remember wherefrom it is, I got it off a friend long time ago. The toroid measures 33x20x11mm, is black and has the text "52509 77550A7" stamped on it. Help is very much appreciated!

29th April 2007, 09:40 PM	#3
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	A photo would help...... __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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29th April 2007, 08:43 PM	#2
Minion diyAudio Member Join Date: May 2006	well get your DMM out and measure it....I don"t think anyone here that will come over just to test your Torroid for you...

29th April 2007, 10:01 PM	#4
zilog diyAudio Member Join Date: Oct 2005	It's black.. I have measured it, and Al= 28.06 nH/n^2, do you think it is safe to use it up to 0.8T assuming inductance does not drop too much given it is some kind of iron powder? EDIT: wrong Al.

29th April 2007, 10:01 PM	#5
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	The number might be a house number, though it seems strangely familiar. I can't find it in my Arnold, Amidon, or Micrometals catalogs. If you have a way to measure inductance, it's not hard to wind a known number of turns on it, then calculate mu, then compare it with various catalog types for material. I do that with most of the surplus hamfest toroids I find. If you want to do that, I'll look up the formula.

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