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 w3AKBCkJ027512 for ; Tue, 10 Apr 2018 22:11:15 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1f5zVm-0003cy-21 for rs_out_1@blacksheep.org; Tue, 10 Apr 2018 21:05:02 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1f5zVl-0003cn-8o for rsgb_lf_group@blacksheep.org; Tue, 10 Apr 2018 21:05:01 +0100 Received: from mout.perfora.net ([74.208.4.194]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1f5zVe-00045b-Er for rsgb_lf_group@blacksheep.org; Tue, 10 Apr 2018 21:04:59 +0100 Received: from [192.168.1.127] ([72.224.254.201]) by mrelay.perfora.net (mreueus002 [74.208.5.2]) with ESMTPA (Nemesis) id 0LsAZt-1eLCwz2wjn-013v36 for ; Tue, 10 Apr 2018 22:04:46 +0200 From: N1BUG To: rsgb_lf_group@blacksheep.org References: <162a4797468-1db9-bdf2@webjas-vae168.srv.aolmail.net> <4D19B3707137430CBE04857FBA5C80B1@gnat> <1b882ae9-fede-3ec4-256e-9b068d3acf99@n1bug.com> <1539CCA16B9A4092972CB000BE4C440A@DELL4> <7606DCC26D954BD1AE881D54F9F2894A@DELL4> <6832cf3c-a6e3-7b11-79dd-95f42cd9bcee@n1bug.com> <1UQRR1pNEA.1SfJSy9fbpz@optiplex980-pc> <1UQRR3nqRO.3cTL9jSmUHx@optiplex980-pc> Openpgp: preference=signencrypt Autocrypt: addr=paul@n1bug.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Provags-ID: V03:K1:OQ5hhQV75+aGVDZ1voMYISJ3eTRUjuEn64y3wr74xhJUVdzDVpe 9D0GKhqqYOYZtVveSm/WktRW5KXxMPi/LleQ+Oi9/B1rolqyC/eGTtCyR4y32/4bF0SXEg5 LvzCQoeG35rM/buk3yzYNiitxY7dreoaBCA9KXzhxeWy8T/JcW2FcgeY8KmRNEDdfHYC7By SDLfqWnb2D4hfhsKMoO3g== X-UI-Out-Filterresults: notjunk:1;V01:K0:qaPTkXF2VRo=:xr56+HcSEgsnuPYfrXxrHu p3+L8sqp/lL0PoFJNsq2HKGpgnAT+JamIH3amSaju3wQhGI1OT0G2m+/bwx+hd6MMxoKhlft+ 4el5pLMaocKsBLaub7gEdWKVq5diFLSP+EV1zzGs62YVRzr/cfKNP+R30b5ZB6CIu03Klq6Ed r8qUBfgJHyh4w6BZr7eZwZO7WKjl/wipMbjUgjFZ0uRTI5oB+LpGE0yOlvtE77dwIwD4627tf uPXaW9g17gkzB84/8ay87HxZv7zHQoyH5R0Hj2hybw9z1szvsvbQ5Yrx1Y9pR7QYFuP4mx6XL jaLxiOejngVckz+Ek34bVHBtRtti6iYaRmz4J1o/iT6ofoGc3zvUVISPEp5GoQs0lAB33YOHf uY5IO4+QXCdDoxI0sa8gkWllpMMUMC3Bnw6/J8B3v8yjGbs/F5H3Tgnp5eOGVQl0TGXlt/pfA 28hTxxJOQwYAvhrDH2DBOeefBiXIW+w7yNM/A5JcAWqCW6PGiamylzbGk7ZJJ1ceMHgmSuQ1/ qSNwTkfwLFImUXwHz9ajspK75Wzc/r2lkZ2V/uHEb+j5Y19qWSQs6xesan5nmsoa2y7gYAuZg 1wxCGb548G2O23hDQuMXFQZ5J8mwRL0HkIJLayp8HEnorO0Wr0nldpbuAMsFD55ei1puGEZaC bGHEhPbzJ1kuPz1dVKUqWWpct7nbUWqZ7c16GfTMsY/RelviOicOff7C8zH4G71cwK2yzepIr bq/QOFzf2dDlSZmuSO4D8bVk8wYyQNGwJc+m7Rv3d0U76/7Tp/vumKaqeGU= X-Spam-Score: 0.7 (/) 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: OK, let's switch topics a bit. I have a serious drain circuit ringing problem that most builders apparently don't have. Many things change all but the first peak of the ringing, but that first one is stubborn. It almost seems like that first big peak is being "forced" to occur somehow. [...] Content analysis details: (0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.6 URIBL_SBL Contains an URL's NS IP listed in the Spamhaus SBL blocklist [URIs: www.n1bug.com] 0.1 URIBL_SBL_A Contains URL's A record listed in the Spamhaus SBL blocklist [URIs: www.n1bug.com] X-Scan-Signature: f38d515a9cad1e977fcfe251941a8120 Subject: Re: LF: W1VD amp help - IR2110 and timing Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 OK, let's switch topics a bit. I have a serious drain circuit ringing problem that most builders apparently don't have. Many things change all but the first peak of the ringing, but that first one is stubborn. It almost seems like that first big peak is being "forced" to occur somehow. I believe someone mentioned, though I cannot find it now, that cross conduction (one phase starting to switch on before the other is completely off) would exaggerate ringing. I've become curious as to whether the timing in my amp is correct. No one has really commented on this aspect. My driver board is unique and it would not be at all surprising it it has stray capacitance in excess of most! Here are the two gate waveforms overlaid so you can see the crossing: http://www.n1bug.com/gates4-wdv13.jpg And here are the drains similarly overlaid to show the crossing: http://www.n1bug.com/drains2-wdv13.jpg *Is* this OK or could the timing be just a bit off? I lack the knowledge to interpret what I am looking at. *If* it could possibly stand some improvement, do I have control over it? I think the 1000pf caps and 15k resistors on the IR2110 inputs would affect this timing but I haven't been able to work out exactly how or what to change if I wanted to experiment: http://w1vd.com/137-500-KWRev3.0.pdf Paul