Return-Path: Received: from mtain-mk09.r1000.mx.aol.com (mtain-mk09.r1000.mx.aol.com [172.29.97.141]) by air-db03.mail.aol.com (v129.4) with ESMTP id MAILINDB033-86454d2b2a0738d; Mon, 10 Jan 2011 10:47:19 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9529A380000A2; Mon, 10 Jan 2011 10:47:17 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PcJx1-0003tq-Dg for rs_out_1@blacksheep.org; Mon, 10 Jan 2011 15:46:31 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PcJx0-0003tg-SO for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 15:46:30 +0000 Received: from smtp03.online.nl ([194.134.41.33]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PcJwy-0000yP-AE for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 15:46:30 +0000 Received: from smtp03.online.nl (localhost [127.0.0.1]) by smtp03.online.nl (Postfix) with ESMTP id 6AFC4680A1 for ; Mon, 10 Jan 2011 16:46:22 +0100 (CET) Received: from pa3fnytrqxpddu (s5593e077.adsl.wanadoo.nl [85.147.224.119]) by smtp03.online.nl (Postfix) with SMTP for ; Mon, 10 Jan 2011 16:46:22 +0100 (CET) From: To: Date: Mon, 10 Jan 2011 16:46:22 +0100 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 In-Reply-To: Importance: Normal X-Online-Scanned: by Cloudmark authority (on smtp03.online.nl) X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55 Subject: RE: LF: Re: Capacitor warning and First 500kHz Class E breadboard Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.2 required=5.0 tests=FROM_ENDS_IN_NUMS,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-aol-global-disposition: G x-aol-sid: 3039ac1d618d4d2b2a0541af X-AOL-IP: 195.171.43.25 Hi Chris,lf, these capacitors are not bad,they are just not ment for resonant or other critical aplications,just for coupling and decoupling, 73 gl Victor -----Oorspronkelijk bericht----- Van: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]Namens Chris Trayner Verzonden: maandag 10 januari 2011 16:35 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: Re: Capacitor warning and First 500kHz Class E breadboard Hi Andy, > I resurrected a 10n one from the waste bin, connected the C meter (10.9nF at Room Temp) and turned a hair dryer on it. C reduced to 5.4nF as I was watching, and that was probably only around 50C. > Blowing on it shifted the value noticeably. I have a batch of very bad (high temp coef) 22nF I sometimes use for undergrad teaching. Get the students to build an oscillator with them, watch the waveform and then grip the cap between thumb and forefinger. You can see the square wave width change visibly - you don't even need to measure it to realise it's happening. 73, Chris G4OKW