Return-Path: Received: (qmail 87719 invoked from network); 17 Jul 2004 20:32:17 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 17 Jul 2004 20:32:17 -0000 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1Blvsb-000JRT-Cj for dave@picks.force9.co.uk; Sat, 17 Jul 2004 21:33:57 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1Blvqx-000Dm9-I6 for dave@picks.force9.co.uk; Sat, 17 Jul 2004 20:32:15 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1BlvqI-0000YX-09 for rs_out_1@blacksheep.org; Sat, 17 Jul 2004 21:31:34 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1BlvqH-0000YO-Jv for rsgb_lf_group@blacksheep.org; Sat, 17 Jul 2004 21:31:33 +0100 Received: from defout.telus.net ([199.185.220.240] helo=priv-edtnes85.telusplanet.net) by relay.thorcom.net with esmtp (Exim 4.34) id 1BlvqE-0006h3-0p for rsgb_lf_group@blacksheep.org; Sat, 17 Jul 2004 21:31:33 +0100 Received: from cognizant1 ([216.232.223.132]) by priv-edtnes85.telusplanet.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with SMTP id <20040717203122.SMFU16059.priv-edtnes85.telusplanet.net@cognizant1>; Sat, 17 Jul 2004 14:31:22 -0600 Message-ID: <002201c46c3d$060963a0$0201a8c0@private.network> From: "Scott Tilley" To: rsgb_lf_group@blacksheep.org Cc: lowfer@lwca.org Date: Sat, 17 Jul 2004 13:31:21 -0700 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Spam-Score: 1.8 (+) X-Spam-Report: autolearn=no,FROM_ENDS_IN_NUMS=0.869,HTML_30_40=0.809,HTML_MESSAGE=0.001,RCVD_IN_SORBS=0.1 Subject: LF: clicking matching transformer... Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.7 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_30_40, 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) Content-transfer-encoding: 8bit

Any thoughts on if a matching transformer should 'click' when the key is released... Obviously it is likely an inductive reaction to the rapid change in current supplied... When I connect the 48V supply to the system the finals don't last long... OK at 12 and 24V so I feel it is a inductive kickback that's blasting the 200V rated FETs... The system works great into a 6 ohm load driver pushpull without the match xfmr... It must be the inductive kickback...

Perhaps the inductance of the windings it too great?

Damn physics... To quote a power engineer friend of mine "it's a damn shame that FETs behave the way they do, otherwise they would be the perfect device..."

Class E time?

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