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1. [Amps] Ferrite toroids (score: 1): Author: ZL2AAA <zl2aaa@paradise.net.nz>; Date: Fri, 26 Aug 2011 14:36:26 +1200; Can anyone tell me how to check the permeability of ferrite toroids.Morrie _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li; /archives//html/Amps/2011-08/msg00181.html (6,165 bytes)
2. Re: [Amps] Ferrite toroids (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 26 Aug 2011 08:33:20 -0400; Place a couple of turns on it and measure with a handheld LCR meter. Then use the standard formula to back into the AL value. Its not 100% but close enough since ferrites have a wide production toler; /archives//html/Amps/2011-08/msg00189.html (8,148 bytes)
3. Re: [Amps] Ferrite toroids (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 26 Aug 2011 11:58:57 -0700; DANGER, WILL ROBINSON! Ferrite materials have VERY different characteristics as a function of frequency. This simple-minded sort of procedure only tells you about the low frequency behavior of the co; /archives//html/Amps/2011-08/msg00194.html (8,227 bytes)
4. Re: [Amps] Ferrite toroids (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 26 Aug 2011 18:47:47 -0400; Danger yourself. Ive yet to find an unknown ferrite that cant be tested with simple methods to get a ballpark indication. Then its a simple matter of reading the various catalogs to ID with a reasona; /archives//html/Amps/2011-08/msg00199.html (8,845 bytes)
5. Re: [Amps] Ferrite toroids (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 27 Aug 2011 07:34:31 +0100; A very good resource for IDing toroid cores (and many other useful functions) is DL5SWB's 'Mini Ring Core Calculator': <http://www.dl5swb.de/html/mini_ring_core_calculator.htm> This program has data; /archives//html/Amps/2011-08/msg00203.html (8,233 bytes)
6. Re: [Amps] Ferrite toroids (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 27 Aug 2011 08:19:36 -0400; Now THAT is some good info Ian, thanks. Ive used several unknown cores of hi mu on various noise generators around the house. They appear to work as well pound for pound as Fair-Rite of similar value; /archives//html/Amps/2011-08/msg00206.html (9,429 bytes)

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