Return-Path: Received: (qmail 55083 invoked from network); 1 Apr 2005 11:23:26 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore02.plus.net with SMTP; 1 Apr 2005 11:23:26 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DHKFk-000B5p-6P for dave@picks.force9.co.uk; Fri, 01 Apr 2005 12:23:52 +0100 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DHKFR-000B1k-O1 for dave@picks.force9.co.uk; Fri, 01 Apr 2005 12:23:33 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim) id 1DHKIc-0005v0-VG for dave@picks.force9.co.uk; Fri, 01 Apr 2005 12:26:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DHKEE-0004Ss-KZ for rs_out_1@blacksheep.org; Fri, 01 Apr 2005 12:22:18 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DHKEE-0004Sj-90 for rsgb_lf_group@blacksheep.org; Fri, 01 Apr 2005 12:22:18 +0100 Received: from smtp812.mail.ukl.yahoo.com ([217.12.12.202]) by relay.thorcom.net with smtp (Exim 4.43) id 1DHKEC-0007KG-RJ for rsgb_lf_group@blacksheep.org; Fri, 01 Apr 2005 12:22:18 +0100 Received: from unknown (HELO Main) (Alan.Melia@81.131.95.135 with login) by smtp812.mail.ukl.yahoo.com with SMTP; 1 Apr 2005 11:22:10 -0000 Message-ID: <002801c536ad$09684e40$6507a8c0@Main> From: "Alan Melia" To: rsgb_lf_group@blacksheep.org References: <8a.2402b71a.2f7e7ba1@aol.com> Date: Fri, 1 Apr 2005 12:17:59 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 X-SPF-Result: relay.thorcom.net: 217.12.12.202 is neither permitted nor denied by domain of btinternet.com X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: LF: Re: RE: TX Cores / current sensors Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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) Hi Dave there are "high-side" current sensors (Zetex ?) that dont include the resistor readily available but they need some discrete component help with LF PAs because they are only rated at about 30volts. An isolated device sounds ideal, and simplify my idea for a "PA efficiency meter" to tune up with. Cheers de Alan G3NYK ----- Original Message ----- From: To: Sent: 01 April 2005 11:25 Subject: LF: RE: TX Cores / current sensors > 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_ > (http://www.allegromicro.com/hall/currentsensor.asp) > > > 73 > > David >