Return-Path: Received: (qmail 78566 invoked from network); 30 Jan 2004 22:05:28 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore01.plus.net with SMTP; 30 Jan 2004 22:05:28 -0000 Received: (qmail 50071 invoked from network); 30 Jan 2004 22:05:28 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 30 Jan 2004 22:05:27 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1AmglT-000Ct6-2w for dave@picks.force9.co.uk; Fri, 30 Jan 2004 22:05:27 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Amgkm-0007Bm-G4 for rs_out@blacksheep.org; Fri, 30 Jan 2004 22:04:44 +0000 Received: from [62.58.50.89] (helo=postbode02.zonnet.nl) by post.thorcom.com with esmtp (Exim 4.14) id 1Amgkl-0007BR-NB for rsgb_lf_group@blacksheep.org; Fri, 30 Jan 2004 22:04:43 +0000 Received: (qmail 26459 invoked by uid 10); 30 Jan 2004 22:04:12 -0000 Received: (vexira-qq 26443-4789F346 invoked from network) 30 Jan 2004 23:04:12 +0100 X-Fake-Domain: unknown Received: from unknown (HELO ibm) ([62.59.190.67]) (envelope-sender ) by postbode02.zonnet.nl (qmail-ldap-1.03) with SMTP for < >; 30 Jan 2004 22:04:12 -0000 X-Bad-Message-ID: no DNS (ibm) Message-ID: <001601c3e77b$f33a8c40$2102000a@ibm> From: "Dick" To: rsgb_lf_group@blacksheep.org References: <6.0.1.1.2.20040129133740.036bcc40@POP3.freeler.nl> <6.0.1.1.2.20040130133028.02f11dc0@POP3.freeler.nl> <000501c3e779$f5159fc0$57c828c3@erica> Date: Fri, 30 Jan 2004 22:55:57 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Antivirus: checked by Vexira MailArmor (version: 2.0.1.16; VAE: 6.23.0.3; VDF: 6.23.0.53; host: postbode02.zonnet.nl) Subject: LF: What NTC to use with an transformer Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 2 Hello all, I am starting with an powersupply in order to have something to feed an amp. I have some nice transformers here, one of them being 50V/1000VA. To limit the current when switching on such a large powersupply, I'm thinking of using an NTC in the primaire part. Question however is, what value should I take?????? Their nominal value seems to be given at 25 degrees C. I'm thinking of 1Ohm, and an Imax of 9 Amp. Will that be good enough?????? Dick, pa4vhf