Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Mon, 13 Jul 2020 15:49:22 -0700 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 06DMdwvL027977; Mon, 13 Jul 2020 18:40:11 -0400 Received: from outgoing-exchange-7.mit.edu (OUTGOING-EXCHANGE-7.MIT.EDU [18.9.28.58]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 06DMdumV027973 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Mon, 13 Jul 2020 18:39:57 -0400 Received: from oc11exedge1.exchange.mit.edu (OC11EXEDGE1.EXCHANGE.MIT.EDU [18.9.3.17]) by outgoing-exchange-7.mit.edu (8.14.7/8.12.4) with ESMTP id 06DMcOIk028603 for ; Mon, 13 Jul 2020 18:38:25 -0400 Received: from w92extsm1.exchange.mit.edu (18.7.74.52) by oc11exedge1.exchange.mit.edu (18.9.3.17) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Mon, 13 Jul 2020 18:39:54 -0400 Received: from oc11exhyb7.exchange.mit.edu (18.9.1.112) by w92extsm1.exchange.mit.edu (18.7.74.52) with Microsoft SMTP Server (TLS) id 15.0.1365.1; Mon, 13 Jul 2020 18:39:56 -0400 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (104.47.57.170) by oc11exhyb7.exchange.mit.edu (18.9.1.112) with Microsoft SMTP Server (TLS) id 15.0.1395.4 via Frontend Transport; Mon, 13 Jul 2020 18:39:55 -0400 Received: from DM6PR12CA0021.namprd12.prod.outlook.com (2603:10b6:5:1c0::34) by DM6PR01MB4843.prod.exchangelabs.com (2603:10b6:5:6a::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3174.20; Mon, 13 Jul 2020 22:39:52 +0000 Received: from DM3NAM03FT017.eop-NAM03.prod.protection.outlook.com (2603:10b6:5:1c0:cafe::a1) by DM6PR12CA0021.outlook.office365.com (2603:10b6:5:1c0::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3174.21 via Frontend Transport; Mon, 13 Jul 2020 22:39:52 +0000 Received: from mail-ej1-f44.google.com (209.85.218.44) by DM3NAM03FT017.mail.protection.outlook.com (10.152.82.201) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3174.21 via Frontend Transport; Mon, 13 Jul 2020 22:39:52 +0000 Received: by mail-ej1-f44.google.com with SMTP id f12so19285733eja.9 for ; Mon, 13 Jul 2020 15:39:52 -0700 (PDT) From: RussellMc To: Microcontroller discussion list - Public. Sender: "piclist-bounces@mit.edu" Date: Mon, 13 Jul 2020 15:39:15 -0700 Subject: Re: [EE] Microwave Oven Transformers Thread-Topic: [EE] Microwave Oven Transformers Thread-Index: AdZZZ9pOddgZRHrIRneyrgsHY7Ztlg== Message-ID: References: List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: Pass X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: Pass (protection.outlook.com: domain of gmail.com designates 209.85.218.44 as permitted sender) receiver=protection.outlook.com; client-ip=209.85.218.44; helo=mail-ej1-f44.google.com; dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=H9uGq8th8IylU2+jTcSvivbnLkGWlhImGAWnoG+oKXE=; b=S312dl3Yxzc4FAQCpPMocxd99qPo/ozUlGWbKCWYY6uhSnJareNM2eIcCIBJfZuAMr kvrebxKyMIU9Ost0uV9asclqTGzaHMAl+INfnGW//XqOTcFt+A1osuWebyqhEBx0M102 OsQqSac9m74HL5oDTgxMQaBp6pjebahMildKUPU0aH0+umOz4EACyQpWhQh5PV0ITDYw BbTd6KU0K+OW+l5pWKzaRcjwuAQFPvJ9v0ai2fDeUpAtu2fGuA0/u0Wmz8741NK+z8rv 7zlO0CgUC5hyPZ1Z48m1fRePGrCumj7SijJpzVKqcgpu/eKoLHXJWrS7ROn3O/UKOR5D QyzA== authentication-results: spf=pass (sender IP is 209.85.218.44) smtp.mailfrom=gmail.com; mit.edu; dkim=pass (signature was verified) header.d=gmail.com; mit.edu; dmarc=pass action=none header.from=gmail.com; errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-received: by 2002:a17:906:2c18:: with SMTP id e24mr1900947ejh.335.1594679991228; Mon, 13 Jul 2020 15:39:51 -0700 (PDT) x-topics: [EE] x-content-filtered-by: Mailman/MimeDel 2.1.6 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 On Tue, 14 Jul 2020 at 04:23, Bob Blick wrote: > I am in need of a large DC choke and thinking about making one from a > microwave oven transformer. It appears that the E's and I's of the core a= re > not interleaved so all I need to do is cut the weld holding the core > together and it should fall apart. Hopefully in just two pieces. Then I c= an > strip out the windings, put my own winding on, and, most importantly, > sandwich a spacer so I have a gap (I said this was a DC choke). > > Anyone here ever play with microwave oven transformers at this level and > learned any hard lessons? > > Have done the obligatory spot welder - less oomph than desired for task in mind. Falls apart when welds removed. No hard lessons in this application. DC choke may have some of it's own :-)- let us know. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .