Return-Path: Received: (qmail 80138 invoked from network); 1 Apr 2005 16:30:17 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 1 Apr 2005 16:30:17 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DHP2j-0005JY-Mw for dave@picks.force9.co.uk; Fri, 01 Apr 2005 17:30:45 +0100 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DHP2j-0005JV-KV for dave@picks.force9.co.uk; Fri, 01 Apr 2005 17:30:45 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim) id 1DHP5t-0005W8-Cr for dave@picks.force9.co.uk; Fri, 01 Apr 2005 17:34:01 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DHP1w-00058M-1b for rs_out_1@blacksheep.org; Fri, 01 Apr 2005 17:29:56 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DHP1v-00058D-K1 for rsgb_lf_group@blacksheep.org; Fri, 01 Apr 2005 17:29:55 +0100 Received: from fmmailgate04.web.de ([217.72.192.242]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DHP1u-0000Gg-24 for rsgb_lf_group@blacksheep.org; Fri, 01 Apr 2005 17:29:55 +0100 Received: by fmmailgate04.web.de (8.12.10/8.12.10/webde Linux 0.7) with SMTP id j31GTp2K011324 for rsgb_lf_group@blacksheep.org; Fri, 1 Apr 2005 18:29:51 +0200 Received: from [217.248.186.240] by freemailng1801.web.de with HTTP; Fri, 01 Apr 2005 18:29:44 +0200 Date: Fri, 01 Apr 2005 18:29:44 +0200 Message-Id: <326392110@web.de> MIME-Version: 1.0 From: "Hans-Albrecht Haffa" To: rsgb_lf_group@blacksheep.org Organization: http://freemail.web.de/ X-SPF-Result: relay.thorcom.net: 217.72.192.242 is neither permitted nor denied by domain of web.de X-Spam-Score: 0.4 (/) X-Spam-Report: autolearn=no,HTML_60_70=0.027,HTML_MESSAGE=0.001,HTML_TEXT_AFTER_BODY=0.151,HTML_TEXT_AFTER_HTML=0.205 Subject: LF: RE: TX Cores, Gap from DK 8 ND Content-Type: multipart/mixed; boundary="------------040209000606070402050203" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50, HTML_FONTCOLOR_UNKNOWN,HTML_MESSAGE 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) This is a multi-part message in MIME format. --------------040209000606070402050203 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Dear Lowfers, any ferrite core should have a gap. This is necessary to reduce the remanent flux from about 180 mT to as low as 30 mT. It may be just the residuous gap of lapped cores, preferrable is to put a layer of capton tape on one outer leg of an EE-Core (EDT59 and the like). Lowering remanent flux will rise flux swing at operation. Apparently it is not a problem at 136kHz, as core saturation is unlikely at this frequency. Saturation will occure at frequencies below 50 kHz during startup of push-pull switching circuits (symmetrical half bridge or full bridge), designed by beginners. A gap as low as 0.05 mm (one layer self adhesive film tape or a bit of varnish) will hardly lower permeability, so from urel=2700 down to urel=1500. If You can, use this effect. A toroid core is often second choice in power electronics. Two paralleled ETD cores have greater surface than two stacked toroids. With the ETDs copper volume is doubled too. not so with the stacked toroids. So if You can buy ET D cores , do it. They are available at Conrad.com or conrad.de. 55, Hans-Albrecht DK 8 ND -----Ursprüngliche Nachricht (HTML) wurde als Anlage beigefügt.----- Von: rsgb_lf_group@blacksheep.org Gesendet: 01.04.05 11:11:24 An: "Hans-Albrecht Haffa" Betreff: Re: LF: RE: TX Cores __________________________________________________________ Mit WEB.DE FreePhone mit hoechster Qualitaet ab 0 Ct./Min. weltweit telefonieren! http://freephone.web.de/?mc=021201 --------------040209000606070402050203 Content-Type: text/html; charset=ISO-8859-1; name="Original_Mail.html" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="Original_Mail.html" PEhUTUw+DQo8SEVBRD4NCjxUSVRMRT5yc2diX2xmX2dyb3VwQGJsYWNrc2hlZXAub3JnLCA8 cnNnYl9sZl9ncm91cEBibGFja3NoZWVwLm9yZz4gc2NocmllYiBhbSAwMS4wNC4wNSAxMTox MToyNDwvVElUTEU+DQo8TUVUQSBIVFRQLUVRVUlWPSJDb250ZW50LVR5cGUiIENPTlRFTlQ9 InRleHQvaHRtbDsgY2hhcnNldD1pc28tODg1OS0xIj4NCjwvSEVBRD4NCjxCT0RZPg0KLS0t 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