Return-Path: Received: (qmail 19754 invoked from network); 13 Nov 2002 18:51:14 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 13 Nov 2002 18:51:14 -0000 Received: (qmail 5404 invoked from network); 13 Nov 2002 15:53:20 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 13 Nov 2002 15:53:19 -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 18Bznc-0006AA-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 13 Nov 2002 15:51:28 +0000 Received: from [62.253.164.42] (helo=mta2-svc.business.ntl.com) by post.thorcom.com with esmtp (Exim 4.10) id 18Bznc-0006A1-00 for rsgb_lf_group@blacksheep.org; Wed, 13 Nov 2002 15:51:28 +0000 Received: from there ([217.137.96.4]) by mta2-svc.business.ntl.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20021113155127.KVAQ3351.mta2-svc.business.ntl.com@there> for ; Wed, 13 Nov 2002 15:51:27 +0000 From: "Steve Thompson" To: rsgb_lf_group@blacksheep.org Date: Wed, 13 Nov 2002 15:53:01 +0000 X-Mailer: KMail [version 1.3.1] References: <01C28B21.86353210.g4jnt@thersgb.net> In-reply-to: <01C28B21.86353210.g4jnt@thersgb.net> MIME-Version: 1.0 Message-ID: <20021113155127.KVAQ3351.mta2-svc.business.ntl.com@there> Content-Type: text/plain; charset=iso-8859-1; format=flowed Subject: Re: LF: RE: Tuesday's riddle (part 2) Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=-1.3 required=5.0tests=IN_REP_TO,QUOTED_EMAIL_TEXT,REFERENCES,SPAM_PHRASE_00_01version=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group On Wednesday 13 November 2002 14:32, you wrote: > I didn't get anything like that, but the negative voltage generator has a > pronounced threshold as the device starts to avalanche. > I wonder if you are getting an effect caused by the capacitive loading of > the scope probe coupled with, perhaps, a negative resistance region over > the few mV close to avalanche start. Again a guess. Steve's memory of > Bob Pease's explanation is a bit unexpected, I wouldn't have thought a > reverse biassed junction would generate light. After all, LEDs are forward > biassed in operation. As best I recall the article, the light is visible with a microscope Steve