Return-Path: Received: from rly-me10.mx.aol.com (rly-me10.mail.aol.com [172.20.83.44]) by air-me03.mail.aol.com (v124.15) with ESMTP id MAILINME032-9df4a5cf96928f; Tue, 14 Jul 2009 17:32:48 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-me10.mx.aol.com (v124.15) with ESMTP id MAILRELAYINME103-9df4a5cf96928f; Tue, 14 Jul 2009 17:32:27 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MQpb8-0004Cf-Ey for rs_out_1@blacksheep.org; Tue, 14 Jul 2009 22:31:38 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MQpb8-0004CV-0W for rsgb_lf_group@blacksheep.org; Tue, 14 Jul 2009 22:31:38 +0100 Received: from outbound-jn.vgs.untd.com ([64.136.55.20]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1MQpaw-0005rg-Gi for rsgb_lf_group@blacksheep.org; Tue, 14 Jul 2009 22:31:28 +0100 X-UOL-TAGLINE: true Received: from outbound-jn.vgs.untd.com (localhost [127.0.0.1]) by m03.vgs.untd.com with SMTP id AABFF38KCANRDVPA for (sender ); Tue, 14 Jul 2009 14:31:14 -0700 (PDT) X-UNTD-OriginStamp: yokUgcxCbtTP7XLrpefewNBQFsbdNq/Hv1yzeHOdrp8Gsdsm/AZqXg== Received: (from riese-k3djc@juno.com) by m03.vgs.untd.com (jqueuemail) id PMF9U2A5; Tue, 14 Jul 2009 14:30:51 PDT To: rsgb_lf_group@blacksheep.org Date: Tue, 14 Jul 2009 17:25:25 -0400 Message-ID: <20090714.172909.704.3.riese-k3djc@juno.com> X-Mailer: Juno 5.0.49 MIME-Version: 1.0 X-Juno-Line-Breaks: 8-6,7-20,22-23,31-39,40-32767 From: riese-k3djc@juno.com X-ContentStamp: 11:5:3222390038 X-MAIL-INFO:026dd01074601539d93d810c7115754044f0302100f52df5300d8dd42535ed X-UNTD-Peer-Info: 127.0.0.1|localhost|outbound-jn.vgs.untd.com|riese-k3djc@juno.com X-Karma: unknown: X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: Microwave oven transformers Content-Type: multipart/alternative; boundary=--__JNP_000_617e.22fc.04f7 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_20_30,HTML_MESSAGE, NO_REAL_NAME 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 X-AOL-IP: 193.82.116.20 ----__JNP_000_617e.22fc.04f7 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit they work well,, removal of the shunts helps with the regulation hopefully yours will have the grounded side of the winding brought out to a terminal where you can open it and make a full wave supply. The other option is to use 2 matched transformers that have their windings internally grounded in a supply that would use a grounded center for the secondary nice light weight high power transformers I have used one for my 144 amp for 10 years with no problems 2200 volts at 250 mils or better the newest Mwave ovens will use switching supply so get them on big trash pick up day while you can Bob K3DJC On Tue, 14 Jul 2009 20:21:56 +0100 "Ken" writes: Hello everyone. Does any one have experience in using microwave oven transformers in high voltage power units, I acquired two of these at the weekend. I was informed that as they stand the voltage regulation is poor, to improve this the 'Core Shunts' should be removed, (these are laminations between the two stacks), removal of these 'shunts' also has the effect of considerably increasing the magnetisation current. The solution to this seems to be to use two transformers, connecting the both primaries and secondary's in series to restore the 2KV output voltage. Any comments on this most welcome Note for Mal, this is serious stuff not for appliance operators. Regards Ken Wright 73 de M0KHW ____________________________________________________________ Find success and happiness with drug and alcohol rehabilitation. Click now. http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTJWRWktNjfwCdkYmLURb1VEOgF9nbvRaZvH6mCNSPmUlHcGu5WapK/ ----__JNP_000_617e.22fc.04f7 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: quoted-printable
they work well,, removal of the shunts helps with the regulation
hopefully yours will have the grounded side of the winding
brought out to a terminal where you can open it and
make a full wave supply. The other option is to use 2 matched
transformers that have their windings internally grounded in a
supply that would use a grounded center for the secondary
nice light weight high power transformers
I have used one for my 144 amp for 10 years with no problems
2200 volts at 250 mils or better
the newest Mwave ovens will use switching supply
so get them on big trash pick up day while you can
 
Bob K3DJC 
 
On Tue, 14 Jul 2009 20:21:56 +0100 "Ken" <ken.h.wright@btinternet.com>=20 writes:
Hello everyone.
Does any one have experience in using= microwave=20 oven transformers in high voltage power units, I acquired two of these= at the=20 weekend. I was informed that as they stand the voltage regulation is poo= r, to=20 improve this the 'Core Shunts' should be removed, (these are laminations= =20 between the two stacks), removal of these 'shunts' also has the effect= of=20 considerably increasing the magnetisation current. The solution to this= seems=20 to be to use two transformers, connecting the both primaries and seconda= ry's=20 in series to restore the 2KV output voltage.
 
Any comments on this most welcome
 
Note for Mal, this is serious stuff not= for=20 appliance operators.
 
Regards
Ken Wright
 
73 de M0KHW
 


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