X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-02.southeast.rr.com ([24.25.9.101] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2248772 for flyrotary@lancaironline.net; Tue, 07 Aug 2007 17:49:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-02.southeast.rr.com (8.13.6/8.13.6) with SMTP id l77LmASs027477 for ; Tue, 7 Aug 2007 17:48:11 -0400 (EDT) Message-ID: <000601c7d93c$c7bc4ca0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: Tantalum capacitors Update Date: Tue, 7 Aug 2007 17:49:06 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01C7D91B.404DBF90" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0003_01C7D91B.404DBF90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable A month or so ago (time flies when having fun), I mentioned having a = couple of PCB boards using Tantalum capacitors malfunction and one = actually self-destructed to the point the PCB was charred. A lot of = discussion and comments from folks who had real-life experience with the = followed. =20 The essence was that if used properly and within designed ratings TANT = capacitors had a long history of successful usage. However, hearing = that explosions and fire on rare occasion did actually occur, I decided = that I personally would not want them in my design. I therefore redesigned my boards for ceramic capacitors. I am happy to = say I have built 5 new boards and have not had any problem with them. = This is not to say that I hold the TANT capacitors responsible for the = earlier failures, but I do know, I have not had any problems since. FWIW Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html ------=_NextPart_000_0003_01C7D91B.404DBF90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

A month or so ago (time flies when having = fun), I=20 mentioned having a couple of PCB boards using Tantalum capacitors = malfunction=20 and one actually self-destructed to the point the PCB was charred. = A lot=20 of discussion and comments from folks who had real-life experience with = the=20 followed.

The essence was that if used properly and within = designed=20 ratings TANT capacitors had a long history of successful usage. = However,=20 hearing that explosions and fire on rare occasion did actually occur, I = decided=20 that I personally would not want them in my design.

I therefore redesigned my boards for ceramic=20 capacitors. I am happy to say I have built 5 new boards and have = not had=20 any problem with them. This is not to say that I hold the TANT = capacitors=20 responsible for the earlier failures, but I do know, I have not had any = problems=20 since.

FWIW

Ed Anderson
Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eanderson@carolina.rr.comhttp:/= /members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda= /index.html

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