Return-Path: Received: from mtain-mh05.r1000.mx.aol.com (mtain-mh05.r1000.mx.aol.com [172.29.96.217]) by air-md07.mail.aol.com (v129.4) with ESMTP id MAILINMD073-8b8e4d616a5a381; Sun, 20 Feb 2011 14:24:10 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mh05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 2E60638000082; Sun, 20 Feb 2011 14:24:08 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PrErw-0000BJ-Bh for rs_out_1@blacksheep.org; Sun, 20 Feb 2011 19:22:56 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PrErv-0000BA-MJ for rsgb_lf_group@blacksheep.org; Sun, 20 Feb 2011 19:22:55 +0000 Received: from fmmailgate06.web.de ([217.72.192.247]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PrErs-0001or-O7 for rsgb_lf_group@blacksheep.org; Sun, 20 Feb 2011 19:22:55 +0000 Received: from mwmweb068 ( [172.20.18.82]) by fmmailgate06.web.de (Postfix) with ESMTP id 974B1878311 for ; Sun, 20 Feb 2011 20:22:46 +0100 (CET) Received: from [84.161.218.236] by mwmweb068 with HTTP; Sun Feb 20 20:22:46 CET 2011 Date: Sun, 20 Feb 2011 20:22:46 +0100 (CET) From: "Hans-Albrecht Haffa" To: rsgb_lf_group@blacksheep.org Message-ID: <949432225.7185542.1298229766613.JavaMail.fmail@mwmweb068> In-Reply-To: <004201cbd111$5d4567f0$0401a8c0@xphd97xgq27nyf> References: <004201cbd111$5d4567f0$0401a8c0@xphd97xgq27nyf> MIME-Version: 1.0 X-UI-Message-Type: mail X-Priority: 3 Importance: normal Sensitivity: Normal X-Provags-ID: V01U2FsdGVkX1+sgCJKYai2ti8Xhdy6RcPrfz5pzxZt6HRp7kJA1Ipm6Pdw7zLYiVIG LPLIpchTDpOomsdj0N17P+9DXvn77RFyD4mH3vZdYlY= X-Spam-Score: 1.5 (+) X-Spam-Report: autolearn=disabled,HTML_IMAGE_ONLY_28=1.014,HTML_MESSAGE=0.001,HTML_MIME_NO_HTML_TAG=0.512,MIME_HTML_ONLY=0.001 Subject: Re: LF: toroid xformer Content-Type: multipart/mixed; boundary="----=_Part_7177616_1666195578.1298229245726" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: *** X-Spam-Status: No, hits=3.8 required=5.0 tests=HTML_50_60,HTML_IMAGE_ONLY_12, HTML_MESSAGE,HTML_MIME_NO_HTML_TAG,MIME_HTML_ONLY,PRIORITY_NO_NAME 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-global-disposition: G x-aol-sid: 3039ac1d60d94d616a583c73 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) ------=_Part_7177616_1666195578.1298229245726 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-UI-ATTACHMENT-ID-POSTFIX: 4bb436a9-1bf8-48ea-81f2-27eb73d3b408 Dear Mal,
do not expect anything from laminated sheet iron core= s. Usable frequencxys depends on the thicknes of the Iron sheets, and the= conductivity ot the material. Therefore the iron is alloyed with silicon= and aluminium, to reduce edding currents. Best frequ. for Mains transform= ers is 200 Hz, with superior sheet iron 400 Hz. Toroid cores from vitrous= glasses would be best, but are not available, only as catalog numbers at= Vacuumschmelze Hanau or Arnold, Micrometals and other manufacturers of ma= terials. They do not offer kits with cores and coilformers . This problem= is widely discussed in students lessons of the type "Maxwells equations= and the transformer with laminated Iron core. "

55, Hans-Albre= cht
DK 8 ND

=

Von: "mal hamilton" <g3kevmal@talktalk.net>
Gesendet:= 20.02.2011 16:18:01
An: rsgb <rsgb_lf_group@blacksheep= .org>
Betreff: LF: toroid xformer

LF

Has anyone measured the efficienc= y of a mains toroid xformer on 9 Khz. I have some of these which could be= useful.

ie 230v Prim and 6/12/24 v Sec,= rated 10A at 12v

de mal/g3kev

NEU: FreePhone - kostenlos mobil telefonieren und surfen! =
Jetzt informieren: http://produkte.web.de/go/webdefreephon= e

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