Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: from rly-mg08.mx.aol.com (rly-mg08.mail.aol.com [172.20.83.114]) by air-mg01.mail.aol.com (v121_r4.4) with ESMTP id MAILINMG011-a2d49257e411a0; Thu, 20 Nov 2008 10:12:08 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mg08.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINMG087-a2d49257e411a0; Thu, 20 Nov 2008 10:12:04 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1L3BBY-0004xj-JS for rs_out_1@blacksheep.org; Thu, 20 Nov 2008 15:11:12 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1L3BBY-0004xa-6q for rsgb_lf_group@blacksheep.org; Thu, 20 Nov 2008 15:11:12 +0000 Received: from mbox2.netikka.net ([213.250.81.203]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from <phl@netikka.fi>) id 1L3BBV-0006SG-R0 for rsgb_lf_group@blacksheep.org; Thu, 20 Nov 2008 15:11:12 +0000 Received: from mbox2-vams.netikka.net (mbox2 [127.0.0.1]) by mbox2-scanned.netikka.net (Postfix) with SMTP id 36F79408165 for <rsgb_lf_group@blacksheep.org>; Thu, 20 Nov 2008 17:11:01 +0200 (EET) Received: from imp1.netikka.net (imp1.netikka.net [213.250.85.154]) by mbox2.netikka.net (Postfix) with ESMTP id 31BC7408165 for <rsgb_lf_group@blacksheep.org>; Thu, 20 Nov 2008 17:10:59 +0200 (EET) Received: from localhost (localhost [127.0.0.1]) by imp1.netikka.net (Postfix) with ESMTP id 0D8AB495B92 for <rsgb_lf_group@blacksheep.org>; Thu, 20 Nov 2008 17:10:59 +0200 (EET) Received: from eur-info24.infonet.com (eur-info24.infonet.com [213.31.11.24]) by imp.netikka.net (IMP) with HTTP for <lindpa02@localhost>; Thu, 20 Nov 2008 17:10:59 +0200 Message-ID: <1227193859.49257e0306cc6@imp.netikka.net> Date: Thu, 20 Nov 2008 17:10:59 +0200 From: Paul-Henrik <phl@netikka.fi> To: rsgb_lf_group@blacksheep.org References: <001e01c94a77$cc1fa780$a402a8c0@Inspiron> <004e01c94a9c$dddbe860$0900a8c0@AM> <1227166876.4925149c95ec8@imp.netikka.net> <49251A7B.6050603@telia.com> In-Reply-To: <49251A7B.6050603@telia.com> MIME-Version: 1.0 User-Agent: Internet Messaging Program (IMP) 3.2.6 X-Originating-IP: 213.31.11.24 X-Karma: 0: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: 3C85/90 Toroids Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) I forgot to mention one important thing in my last reply: >From the earlier discussions on this subject I got the impression that T130-= 3 and T200-2 cores were suggested as alternatives to the 3C85/3C90. The mixes #2 and #3 are powder iron, not ferrite as the 3F3 and 3C85/3C90. I beleive they are poorly suited as power transformers on LF/MF but make good inductors for low-pass filters on 136 and 500kHz. This is true at least for=20= the #2 mix. On 500kHz I remember seeing reports of severe LPF heating with the #= 3 mix, I will have to check again on that. Some of the gurus please correct me if I'm wrong here. I just wanted to pres= s the "pause and think again" button before someone possibly orders inductor cores to use for a transformer. I'm still a beginner/learner in this game, the above is just how I see thing= s today. 73's Paul-Henrik Quoting "Johan H. Bodin" <jh.bodin@telia.com>: > Yes, 3F3 is even better than 3C85/3C90 for power transformation at a few > hundred > kHz. The 3F3 cores, if coloured, are light blue. Philips sold their ferrit= e > business to Ferroxcube: http://www.ferroxcube.com/ > > 73 > Johan SM6LKM > > > Paul-Henrik wrote: > > Have a look at Ferroxcube (Philips) cores of 3F3 material. As far as I c= an > > interpret datasheets for these, they should work fairly well as > transformers up > > to 500kHz with a DC component and up to 1MHz without DC. > >