X-Virus-Scanned: clean according to Sophos on Logan.com X-Junk-Score: 50 [XX] X-SpamCatcher-Score: 50 [XX] Return-Path: Received: from elasmtp-dupuy.atl.sa.earthlink.net ([209.86.89.62] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6614372 for lml@lancaironline.net; Tue, 26 Nov 2013 02:38:04 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.62; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=FPHBapuvkCa2WWpGdMkV0tSVTkpkPTMDRatN0D4OD7u48rnGELnBQw8KCLY49hei; h=Received:Subject:Mime-Version:Content-Type:From:In-Reply-To:Date:Cc:Message-Id:References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [70.105.253.253] (helo=[192.168.1.24]) by elasmtp-dupuy.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1VlDD7-0003ye-AY; Tue, 26 Nov 2013 02:37:29 -0500 Subject: Re: A couple Tyco papers on emf reduction in relays Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-239--877644416 From: Colyn Case In-Reply-To: <77E4292A-D067-4CF9-B085-01CB6C03F970@earthlink.net> Date: Tue, 26 Nov 2013 02:37:28 -0500 Cc: "lml@lancaironline.net List" Message-Id: References: <77E4292A-D067-4CF9-B085-01CB6C03F970@earthlink.net> To: Colyn Case X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940b5eaf71f3cf24a724541eabc02737b44350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 70.105.253.253 --Apple-Mail-239--877644416 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii links have changed. see below: On Nov 25, 2013, at 9:06 PM, Colyn Case wrote: I just stumbled across these while researching something else. Recently there have been some reference to how to protect switch = circuits connected to relays. Here are two papers done by Tyco which = have been corroborated by certain others and are consistent with Eric = Jones' recommended use of Snapjacks (bi-directional zener diodes). Some methods (not recommended here) of protecting the switch contact = result in extending the opening time of the relay, which causes arcing, = bouncing and degeneration of the relay contacts. (not a good thing for = maximizing starter current). If you are going to do something in this department, I highly recommend = reading these. (or just use EV100 relays and be done with it) Application of Coil Suppression with DC Relays (13C3311) - Jun 21, 2013 Coil Suppression Can Reduce Relay Life (13C3264) - Jun 21, 2013 Here is also some info from Eric's website: http://www.periheliondesign.com/suppressors/SnapJack.pdf --Apple-Mail-239--877644416 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii links = have changed.   see below:

On Nov 25, 2013, at = 9:06 PM, Colyn Case wrote:

Ap= plication of Coil Suppression with DC Relays (13C3311) - Jun 21, = 2013


Here is also some info from Eric's = website:


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