Return-Path: Received: (qmail 36413 invoked from network); 1 Apr 2005 10:26:20 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 1 Apr 2005 10:26:20 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DHJMO-0007a0-Lu for dave@picks.force9.co.uk; Fri, 01 Apr 2005 11:26:42 +0100 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DHJMI-0007Y0-Jt for dave@picks.force9.co.uk; Fri, 01 Apr 2005 11:26:34 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim) id 1DHJPX-0004mp-6J for dave@picks.force9.co.uk; Fri, 01 Apr 2005 11:29:55 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DHJLa-0004LE-Nv for rs_out_1@blacksheep.org; Fri, 01 Apr 2005 11:25:50 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DHJLa-0004L5-BN for rsgb_lf_group@blacksheep.org; Fri, 01 Apr 2005 11:25:50 +0100 Received: from imo-m28.mx.aol.com ([64.12.137.9]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DHJLW-00071c-Qb for rsgb_lf_group@blacksheep.org; Fri, 01 Apr 2005 11:25:50 +0100 Received: from G0MRF@aol.com by imo-m28.mx.aol.com (mail_out_v37_r5.33.) id l.8a.2402b71a (18251) for ; Fri, 1 Apr 2005 05:25:37 -0500 (EST) From: G0MRF@aol.com Message-ID: <8a.2402b71a.2f7e7ba1@aol.com> Date: Fri, 1 Apr 2005 05:25:37 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 SE for Windows sub 5003 X-SPF-Result: relay.thorcom.net: domain of aol.com designates 64.12.137.9 as permitted sender X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=no,HTML_40_50=0.086,HTML_MESSAGE=0.001,NO_REAL_NAME=0.178 Subject: LF: RE: TX Cores / current sensors Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_20_30,HTML_FONTCOLOR_BLUE, 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

For anyone with an RS Components distributor nearby,

I see in their latest catalogue they have introduced a full range of ferrite cores including gapped and ungapped 'kits' that go up to the ETD 59 series (59mm across)

The ETD 59 has a volume of 51,000 mm^3 and would be quite good for a high power PA.

Other forms appear to go up to 100,000mm^2

213-4212 etc

http://rswww.com

While we're talking components. For general info:

There is a new series of current monitoring chips available in the USA.

The devices use some form of hall effect device to sense current passing between two terminals on the IC. The internal electronics converts this into a 0 - 5V DC output which can be used to e.g. drive meters, a trip circuit or the input to an A-D converter etc.

These IC's are designed for high currents. The range goes from about 10 Amps to 150Amps and all this current flows through the IC (!) Needless to say that for the larger current range the terminals that carry the current are very substantial indeed.

http://www.allegromicro.com/hall/currentsensor.asp

73

David