Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id x1ODjxwW016726 for ; Sun, 24 Feb 2019 14:46:00 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gxu2x-0006cu-O3 for rs_out_1@blacksheep.org; Sun, 24 Feb 2019 13:42:23 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gxu2x-0006cl-5L for rsgb_lf_group@blacksheep.org; Sun, 24 Feb 2019 13:42:23 +0000 Received: from mx1.lylix.net ([74.86.36.27]) by relay1.thorcom.net with esmtp (Exim 4.91) (envelope-from ) id 1gxu2v-0003Gr-9W for rsgb_lf_group@blacksheep.org; Sun, 24 Feb 2019 13:42:22 +0000 Received: from no3m.local (dynamic-acs-24-144-206-160.zoominternet.net [24.144.206.160]) (Authenticated sender: eric@lylix.net) by mx1.lylix.net (Postfix) with ESMTPSA id 992261A408BE for ; Sun, 24 Feb 2019 08:42:16 -0500 (EST) To: rsgb_lf_group@blacksheep.org References: <043bec62-8144-5ff3-98a6-9f04699f6a4c@no3m.net> <1551011916482.41235@kuleuven.be> <1551014480338.17397@kuleuven.be> From: Eric NO3M Message-ID: Date: Sun, 24 Feb 2019 08:42:15 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: The driver and FET gates in mine are AC coupled (0.22u, SB560 schottky shunt, 10 ohm series, 4.7k shunt) and the problem still exists.  Apparently same thing Paul N1BUG was having problems with. The [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 21e2055b299bd63ed331c37c8a3e15ca Subject: Re: LF: Re: Class D current spikes Content-Type: multipart/alternative; boundary="------------CD7C842621A5F5B7E81AC796" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=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 This is a multi-part message in MIME format. --------------CD7C842621A5F5B7E81AC796 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit The driver and FET gates in mine are AC coupled (0.22u, SB560 schottky shunt, 10 ohm series, 4.7k shunt) and the problem still exists.  Apparently same thing Paul N1BUG was having problems with. The spike on the end of the RF envelope is what seems most ominous and results in my 48v switcher going into fault mode. On 2/24/19 8:29 AM, Andy Talbot wrote: > Why not AC couple your gates.  That removes all possibility of latching > 100nF in series, reverse biassed diode to ground shunted by 10k or so > for DC restoration > Or transformer couple > > Andy > www.g4jnt.com > > > --------------CD7C842621A5F5B7E81AC796 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit The driver and FET gates in mine are AC coupled (0.22u, SB560 schottky shunt, 10 ohm series, 4.7k shunt) and the problem still exists.  Apparently same thing Paul N1BUG was having problems with.  The spike on the end of the RF envelope is what seems most ominous and results in my 48v switcher going into fault mode.


On 2/24/19 8:29 AM, Andy Talbot wrote:
Why not AC couple your gates.  That removes all possibility of latching
100nF in series, reverse biassed diode to ground shunted by 10k or so for DC restoration
Or transformer couple




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