Return-Path: Received: (qmail 12031 invoked from network); 11 Nov 2002 21:01:17 -0000 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 11 Nov 2002 21:01:17 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 10621 invoked by uid 10001); 11 Nov 2002 20:00:34 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 11 Nov 2002 20:00:33 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18BKic-00076u-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 11 Nov 2002 19:59:34 +0000 Received: from [64.12.136.7] (helo=imo-m04.mx.aol.com) by post.thorcom.com with esmtp (Exim 4.10) id 18BKib-00076l-00 for rsgb_lf_group@blacksheep.org; Mon, 11 Nov 2002 19:59:33 +0000 Received: from MarkusVester@aol.com by imo-m04.mx.aol.com (mail_out_v34.13.) id l.19c.bc77907 (3972) for ; Mon, 11 Nov 2002 14:58:58 -0500 (EST) From: MarkusVester@aol.com Message-ID: <19c.bc77907.2b016601@aol.com> Date: Mon, 11 Nov 2002 14:58:57 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: AOL 7.0 for Windows DE sub 10501 Subject: LF: Tuesday's riddle Content-Type: text/html; charset=windows-1252 X-Spam-Status: No, hits=1.9 required=5.0tests=NO_REAL_NAME,SPAM_PHRASE_02_03,USER_AGENT_AOLversion=2.42 X-Spam-Level: * Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Content-transfer-encoding: 8bit Hi group,

this little experiment was pointed out to me by Ralph, DL2NDO a few years ago:

You need an ordinary NPN transistor (eg. 2N2222), a 9V battery, a 1k resistor and a voltmeter. Connect the negative battery terminal to the base and the positive to the emitter, via the resistor. Now predict the voltage drop between collector and base. Can't be too hard...

Then measure it - you'll be surprised. Any explanations? We finally ended up opening the poor transistor's case.

Have fun
Markus, DF6NM