X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 16 Apr 2009 14:57:21 -0400 Message-ID: X-Original-Return-Path: Received: from n3.bullet.mail.re3.yahoo.com ([68.142.237.110] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with SMTP id 3583114 for lml@lancaironline.net; Thu, 16 Apr 2009 08:08:51 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.237.110; envelope-from=casey.gary@yahoo.com Received: from [68.142.237.89] by n3.bullet.mail.re3.yahoo.com with NNFMP; 16 Apr 2009 12:08:11 -0000 Received: from [216.252.110.140] by t5.bullet.re3.yahoo.com with NNFMP; 16 Apr 2009 12:08:11 -0000 Received: from [127.0.0.1] by omp210.mail.re3.yahoo.com with NNFMP; 16 Apr 2009 12:08:11 -0000 X-Yahoo-Newman-Property: ymail-5 X-Yahoo-Newman-Id: 917019.84419.bm@omp210.mail.re3.yahoo.com Received: (qmail 1133 invoked by uid 60001); 16 Apr 2009 12:08:11 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=sfJb6WyRpY6xgzKrE2z13EsAp87+JnO80JQRDLx2pBRnq7nf4qrIlnppVNHzryPgHc0TMiLWkUPmuBAiLya1WO/lMcEavPIMZFfS2ToFhmCuHwcAFRJcIHFVcdHPXXSfVvd3kDhxyk78b43Mb2eqro8InyZJyx8fv4m+TRTFd7w=; X-Original-Message-ID: <777684.487.qm@web57506.mail.re1.yahoo.com> X-YMail-OSG: u2ZxrrEVM1mlEfyJekWyBMndUNGz4WwFiHbDil74ajnM5sGFlF4vuo.dzRLK5RsrmG9rEBGo2JJW8stYkb0ya50l8ABvcCg8KndoDguQyTjGJjDVEQUlzVsthcxDXF5.pOADU14wiRvaf5JvAzesRKJ7re_.Z8GdmPvP2XszruT6sUhl9bypFOKvt1HVsLLitcKISkp9caflJLuvQD8pK5gEzwLJQGzGHmvbzdrK9817UFFj3dfWJymWFGhAMLGgI61z9WI5D5FCLrsczWreDRfvtOQ_AGc.Nj3FW7F_k1208ftYcxa4 Received: from [97.122.154.197] by web57506.mail.re1.yahoo.com via HTTP; Thu, 16 Apr 2009 05:08:11 PDT X-Mailer: YahooMailRC/1277.35 YahooMailWebService/0.7.289.1 X-Original-Date: Thu, 16 Apr 2009 05:08:11 -0700 (PDT) From: Gary Casey Subject: Re: spike suppresion diodes X-Original-To: Lancair Mailing List MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1974551239-1239883691=:487" --0-1974551239-1239883691=:487 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Just as a clarification - the "spike suppression diodes" do not protect the= electrical system from high voltage spikes; they protect the switched devi= ce, which in this case is the solenoid coil of the relay being turned off, = and the switch itself. The coil really doesn't care, and the switch is des= igned to tolerate the resulting arc. The normal wiring (I'm no good at put= ting graphics in an email so I'll do it "verbally.") Goes from the battery = and all your expensive electronics to the switch, to the relay coil, and to= ground(return). The high voltage spike exists only between the switch and= relay coil, no where else. You might be reducing low-amplitude electrical= noise in the system being transmitted through the wiring, but you are not = protecting the rest of the system against high voltage spikes.=0A=0A".... t= o prevent the high voltage spikes... but that info is at the airport...."= =0A=0AGary Casey=0A=0A=0A --0-1974551239-1239883691=:487 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Just as a clarification - the "spike suppression d= iodes" do not protect the electrical system from high voltage spikes; they = protect the switched device, which in this case is the solenoid coil of the= relay being turned off, and the switch itself. =A0The coil really doesn't = care, and the switch is designed to tolerate the resulting arc. =A0The norm= al wiring (I'm no good at putting graphics in an email so I'll do it "verba= lly.") Goes from the battery and all your expensive electronics to the swit= ch, to the relay coil, and to ground(return). =A0The high voltage spike exi= sts only between the switch and relay coil, no where else. =A0You might be = reducing low-amplitude electrical noise in the system being transmitted thr= ough the wiring, but you are not protecting the rest of the system against high voltage spikes.

".= ....=A0to prevent the high voltage spikes... but that info is at the airport= ....."

Gary Casey

=0A=0A --0-1974551239-1239883691=:487--