X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 07 May 2008 09:32:00 -0400 Message-ID: X-Original-Return-Path: Received: from web36904.mail.mud.yahoo.com ([209.191.85.72] verified) by logan.com (CommuniGate Pro SMTP 5.2.2) with SMTP id 2894668 for lml@lancaironline.net; Mon, 05 May 2008 16:11:52 -0400 Received: (qmail 56724 invoked by uid 60001); 5 May 2008 20:11:53 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type:Message-ID; b=RtWiGu9yw4ERPmJUm8vnEPSePwWxqy9cylqNVgYTvHk24hrJMzE812N8FS51582d6bU++/MxSgSeTVLkuGyroZyia/8kSYSRbFIubTyHv49ptgBj8/RhmB7+SxD6ZsLx4CmBLpwdsGsDLxyhhBmQr/uGSZOtMcV+wowh5y6Zb/w=; X-YMail-OSG: igXtHb4VM1lVjFXdQE.cFMwW1Hikq45l8EsP59MzsB0UCZKDqP5tJQxOYWAKEsesOXWGG3LLo4ZKRu_pt0mDcZnHVzfI15crkM4ssRA4tznCyRF4XPfGjCE- Received: from [209.225.224.254] by web36904.mail.mud.yahoo.com via HTTP; Mon, 05 May 2008 13:11:53 PDT X-Mailer: YahooMailRC/975.23 YahooMailWebService/0.7.185 X-Original-Date: Mon, 5 May 2008 13:11:53 -0700 (PDT) From: Chris Zavatson Subject: Re: [LML] Re: Circuit protection X-Original-To: Lancair Mailing List MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-509112954-1210018313=:45558" X-Original-Message-ID: <558664.45558.qm@web36904.mail.mud.yahoo.com> --0-509112954-1210018313=:45558 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Colyn,=0AThe LED indication is not integral to the fuse holder, but added e= xternally.=A0 I go the idea from an article in Sport Aviation about 15 year= s ago.=A0 If you put the LED in parallel (w/resistor) to the fuse, it will = light up if the fuse is missing.=A0 This does assume that there is continui= ty left in the electronic device down stream.=A0 If it were to have a total= melt down and become an open circuit, the LED would not light.=0AFuse hold= ers and LED can be seen on the right side panel.=0Ahttp://www.n91cz.com/In-= Flight-Photos/cockpit-small.JPG=0AI used a similar principle in a push-to-t= est circuit for the landing light.=A0 I check for continuity in the landing= light by passing a few millivolts through the filament and lighting up a L= ED.=0A=0AChris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.com=0A=0A=0A ____= ___________________________________________________________________________= _____=0ABe a better friend, newshound, and =0Aknow-it-all with Yahoo! Mobil= e. Try it now. http://mobile.yahoo.com/;_ylt=3DAhu06i62sR8HDtDypao8Wcj9tA= cJ --0-509112954-1210018313=:45558 Content-Type: text/html; charset=us-ascii
Colyn,
The LED indication is not integral to the fuse holder, but added externally.  I go the idea from an article in Sport Aviation about 15 years ago.  If you put the LED in parallel (w/resistor) to the fuse, it will light up if the fuse is missing.  This does assume that there is continuity left in the electronic device down stream.  If it were to have a total melt down and become an open circuit, the LED would not light.
Fuse holders and LED can be seen on the right side panel.
http://www.n91cz.com/In-Flight-Photos/cockpit-small.JPG
I used a similar principle in a push-to-test circuit for the landing light.  I check for continuity in the landing light by passing a few millivolts through the filament and lighting up a LED.

 
Chris Zavatson
N91CZ
360std
 
 

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