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=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: INFN-TO: mailn 1233; 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 v4T9NdtT027094 for ; Mon, 29 May 2017 11:23:40 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dFGok-0002Ob-Ms for rs_out_1@blacksheep.org; Mon, 29 May 2017 10:18:26 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dFGok-0002OS-6f for rsgb_lf_group@blacksheep.org; Mon, 29 May 2017 10:18:26 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dFGoh-00084j-HK for rsgb_lf_group@blacksheep.org; Mon, 29 May 2017 10:18:24 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 7903E20C77 for ; Mon, 29 May 2017 11:18:21 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3wbrkh1Njwz10BK for ; Mon, 29 May 2017 11:18:20 +0200 (CEST) Message-ID: <592BE75B.6050507@posteo.de> Date: Mon, 29 May 2017 11:18:19 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <1456380282.20170524154713@gmail.com> <5925A16B.7050100@posteo.de> <48702557.20170525114046@gmail.com> <5926C96B.7050206@posteo.de> In-Reply-To: X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: LF: Iron dust toroids and heating/H bridge Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: RO X-Status: X-Keywords: X-UID: 11810 Hello G, Am 26.05.2017 23:21, schrieb Graham: > The H bridge seems a interesting design, one point , the amp is > on frequency , F in = F out ? Yes, there is no divider stage in this design. > > Composite driver IC's are available for the H configuration, > > Have you looked at these ? ?, As far as i know the ones which are cheap and available in small amounts are not suitable for 137 kHz and such power levels. > would seem to simplify construction , to a single out put > transformer , whilst producing less harmonic power ... ? A single housing will concentrate the dissipated power on one spot which is a disadvantage. I prefer the normal TO-247 components... 73, Stefan > > Tnx -G, > G0NBD