Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_MED,SPF_PASS, T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v52DKekL013559 for ; Fri, 2 Jun 2017 15:20:41 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dGmPl-0001mH-Li for rs_out_1@blacksheep.org; Fri, 02 Jun 2017 14:14:53 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dGmPK-0001lL-6V for rsgb_lf_group@blacksheep.org; Fri, 02 Jun 2017 14:14:26 +0100 Received: from mail-wr0-x229.google.com ([2a00:1450:400c:c0c::229]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dGmPF-0000if-Nu for rsgb_lf_group@blacksheep.org; Fri, 02 Jun 2017 14:14:24 +0100 Received: by mail-wr0-x229.google.com with SMTP id v104so6810408wrb.0 for ; Fri, 02 Jun 2017 06:14:21 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:message-id:to:subject:in-reply-to:references:mime-version :content-transfer-encoding; bh=LwWKLWV+FKy8VGVINRyn/W4L9iNRJI5RggYEnCR1I8I=; b=Oi/kdGXwtC/gkwqQZubDpgAraYdZw0QM1P1U+/Jd2Kz8asKgbO/Qb5uXjZ0ak4xpwM 8MXJDbTUOGOUTBbyvp57XN9e2XGkONcvEsw6HLoYSBOY0yENyCmb0CKDzj7FIW5s8+l5 PQEBSm6rwmvg2fHY4vzJwJWZyUzoEXJHHw9hOjSRcgFc0XHQs1MzqiijZuqFUlFfF8LO RvFXqNqS8trGKHZzPIzHCWZ87YNbrbf1lxczEhXCmh3Y+AawEBgDoAm1ZZuiBF0OXa/2 mUxeUN/LnrFS6KIOMcw7QOQrqzvgV4S9DFpzqab7pF0VF7qXOKiwch+dBdzr6ZmtoiJt IJMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:message-id:to:subject:in-reply-to :references:mime-version:content-transfer-encoding; bh=LwWKLWV+FKy8VGVINRyn/W4L9iNRJI5RggYEnCR1I8I=; b=O9Ag4ozN4SB8boWuS9g1HFwPEGNdy9TxEnJUZfAGEPgOQpJC80ghNPDtGvEXYeFb/t 7EOKuo+6ICGs3A3mRfy7qkBjF9Bb6DK+OkiqAUAdwPzxAu7S0HvDem8Zoka+nIFboh31 ZUygZMVmmsSBlAt2UHk1/NqXYM3aXfRtT7g3YpkAgTKb5o93INyjMoaPDlw+UmbNq/zf mKfbcTB9iAw6mRKrHctAlBS57U9TC/tMxBEcKuWCk8pvSv+pAMR/iGbFA48gAwopwV01 SYvfyJ6u1Si3a/sQRulCvQ4LnjiothDB0o+avdgm4yJfIZY3DQKJ7g+95AQyMU3gzCmT SY/Q== X-Gm-Message-State: AODbwcCgrLaO0kRXKafLkFR81exRJn/DhVppSn7AiYVvOnjIKWR2NPRW VzxTV42QT/74+XpM X-Received: by 10.223.135.90 with SMTP id 26mr4686749wrz.199.1496409260497; Fri, 02 Jun 2017 06:14:20 -0700 (PDT) Received: from OfficeWin7.lan (82-70-254-222.dsl.in-addr.zen.co.uk. [82.70.254.222]) by smtp.gmail.com with ESMTPSA id j126sm2666928wmd.29.2017.06.02.06.14.19 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 02 Jun 2017 06:14:19 -0700 (PDT) From: Chris Wilson X-Google-Original-From: Chris Wilson Date: Fri, 2 Jun 2017 14:14:18 +0100 X-Priority: 3 (Normal) Message-ID: <628725908.20170602141418@gmail.com> To: rsgb_lf_group@blacksheep.org In-Reply-To: <15c68e43ee0.marcocadeddu@tin.it> References: <15c68e43ee0.marcocadeddu@tin.it> MIME-Version: 1.0 X-Scan-Signature: 33d261536bb1467bb13d5764461d5ec4 Subject: Re: R: LF: Re: I: Fw: For today the FETs survived... Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.75 Status: O X-Status: X-Keywords: X-UID: 11856 Hello Marco, My loading coil drifts as it warms up, but that's only when a kW or so is run, not at low power. But I think you are testing into a dummy load? I also had a poor drain waveform on one side of my push pull Class "D", that was only cured by changing one of the 2 FET's (that tested fine out of circuit). We "microwavers" are old school now that people are moving to DC toggled every hour or so ;) Friday, June 2, 2017, 2:00:07 PM, you wrote: > Hi Alan, > and thanks for joining :-) > it's hard to believe at this stage that is correct to speak of "high > currents".. > The PA is an half bridge like > Andy's 700W but now I'm testing at low voltage: I see these problem > trepassing the 30Vdc supply level (and power is about 15W).. > Anyway will try with the "pulse rated caps" you suggested just in case > my "low current" "low tension" ideas are wrong. > 73 Marco -- Best regards, Chris mailto:dead_fets@gmail.com