Return-Path: Received: from mtain-mh01.r1000.mx.aol.com (mtain-mh01.r1000.mx.aol.com [172.29.96.213]) by air-da02.mail.aol.com (v129.4) with ESMTP id MAILINDA024-86624d2b2ec118d; Mon, 10 Jan 2011 11:07:29 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mh01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8556338000232; Mon, 10 Jan 2011 11:07:21 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PcKGG-0004A5-Ta for rs_out_1@blacksheep.org; Mon, 10 Jan 2011 16:06:24 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PcKGG-00049w-99 for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 16:06:24 +0000 Received: from blu0-omc1-s20.blu0.hotmail.com ([65.55.116.31]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PcKGF-0001Ak-EF for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 16:06:24 +0000 Received: from BLU146-W19 ([65.55.116.9]) by blu0-omc1-s20.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 10 Jan 2011 08:06:17 -0800 Message-ID: X-Originating-IP: [138.32.32.166] From: Laurence KL7UK To: Date: Mon, 10 Jan 2011 07:06:16 -0900 Importance: Normal In-Reply-To: References: MIME-Version: 1.0 X-OriginalArrivalTime: 10 Jan 2011 16:06:17.0038 (UTC) FILETIME=[4FEE6EE0:01CBB0E0] X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="_5f3fa1ee-8d72-4535-9923-dd8568d89169_" Subject: LF: Cap warning - X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=FORGED_HOTMAIL_RCVD, HTML_MESSAGE 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-sid: 3039ac1d60d54d2b2eb90749 X-AOL-IP: 195.171.43.25 X-Mailer: Unknown (No Version) --_5f3fa1ee-8d72-4535-9923-dd8568d89169_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Andy - also found those Orange Polyester "drop" caps can be slightly lossy= at higher powers - Managed to burn a few up at the 1Kw level @137K :-)) =20 Recall a Blond moment when building the Alans' RF bridge design and using= a ceramic cap as a tester - couldnt figure out why it has 25 ohms loss at= 137kHz - well for a few hours - then it dawned on me....replaced with eit= her a WIMA or Phillips Polyprop and down it went.=20 =20 Laurence KL7UK /1X Subject: LF: Capacitor warning and First 500kHz Class E breadboard A warning to anyone contemplating making power amps - especially class E= types.=20 Don't even think about using the small high voltage ceramic caps availalbl= e at low cost from the suppliers - and sold as "suitable for SMPSUs etc"= in resonant circuits =3D --_5f3fa1ee-8d72-4535-9923-dd8568d89169_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Andy - also found those Orange Polyester "drop" caps can be slig= htly lossy at higher powers - Managed to burn a few up at the 1Kw level @1= 37K :-))

Recall a Blond moment when building the Alans' RF bridge design and= using a ceramic cap as a tester - couldnt figure out why it has 25= ohms loss at 137kHz - well for a few hours - then it dawned on me....repl= aced with either a WIMA or Phillips Polyprop and down it went.

Laurence KL7UK /1X

Subject: LF: Capacitor warning and First 500kHz Class E breadboard

A warning to anyone contemplating making power amps - especially clas= s E types.

Don't even think about using the small high voltage ceramic caps avai= lalble at low cost from the suppliers - and sold as "suitable for SMPSUs= etc" in resonant circuits

=3D --_5f3fa1ee-8d72-4535-9923-dd8568d89169_--