Return-Path: Received: (qmail 6036 invoked from network); 29 Apr 2001 15:54:16 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 29 Apr 2001 15:54:16 -0000 Received: (qmail 24525 invoked from network); 29 Apr 2001 15:53:49 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 29 Apr 2001 15:53:49 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14ttDY-0004eN-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 29 Apr 2001 16:34:36 +0100 Received: from irwell.zetnet.co.uk ([194.247.47.48] helo=zetnet.co.uk ident=root) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14ttDV-0004eI-00 for rsgb_lf_group@blacksheep.org; Sun, 29 Apr 2001 16:34:33 +0100 Received: from oemcomputer (man-058.dialup.zetnet.co.uk [194.247.41.72]) by zetnet.co.uk (8.11.3/8.11.3/Debian 8.11.2-1) with SMTP id f3TFY2N19352 for ; Sun, 29 Apr 2001 16:34:02 +0100 Message-ID: <003201c0d0c1$cbd9fba0$4829f7c2@oemcomputer> From: "John Rabson" To: rsgb_lf_group@blacksheep.org Subject: LF: Power handling capability of ferrite cores Date: Sun, 29 Apr 2001 16:09:32 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2919.6600 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: When I was involved in designing 50 Hz mains transformers we had a rule of thumb that we required one pound of laminations for each 20 VA to be handled. Is it possible to derive an equivalent figure from datasheets for a given type of ferrite and a given frequency? 73 de John Rabson G3PAI