Return-Path: Received: (qmail 20504 invoked from network); 14 Nov 2002 16:38:59 -0000 Received: from mx.last.plus.net (212.159.3.230) by mailstore with SMTP; 14 Nov 2002 16:38:59 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 18891 invoked from network); 14 Nov 2002 14:34:40 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by mx.last.plus.net with SMTP; 14 Nov 2002 14:34:40 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18CL70-0001Xs-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 14 Nov 2002 14:36:54 +0000 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.10) id 18CL70-0001Xj-00 for rsgb_lf_group@blacksheep.org; Thu, 14 Nov 2002 14:36:54 +0000 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 18CKp2-0002Xt-00 for rsgb_lf_group@blacksheep.org; Thu, 14 Nov 2002 14:18:20 +0000 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 18CKoz-0005rB-00 for rsgb_lf_group@blacksheep.org; Thu, 14 Nov 2002 14:18:18 +0000 Message-ID: <5.1.0.14.0.20021114114829.00afb870@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Thu, 14 Nov 2002 14:17:21 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" In-reply-to: <000d01c28b74$3489aba0$a4417ad5@main> MIME-Version: 1.0 X-MailScanner: No Virus detected Subject: Re: LF: Silicon b-e lights up !! Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=0.1 required=5.0tests=DEAR_SOMEBODY,IN_REP_TO,SPAM_PHRASE_00_01version=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group At 23:50 13/11/2002 +0000, you wrote: >Hi all, Oh yes it does.....I've seen it and in fact we used to look at >silicon Planar (Fairchild TM, I think) emitter junctions for poor doping and >masking flaws using that in the early 1960s. Dear Alan, LF Group, I tried it with a 2N2222 - With a few mA B-E reverse current, I could see a few tiny dots of light under x 60 magnification. With 100mA, these merged into a continuous thin line of pinkish-white light in the gap between the base and emitter metalisation, presumably coming from the junction itself. With the high current, it was visible to the naked eye in a darkened room as a tiny dot of light. Cheers, Jim Moritz 73 de M0BMU