X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Sat, 28 Nov 2009 12:54:50 -0500 Message-ID: X-Original-Return-Path: Received: from col0-omc3-s7.col0.hotmail.com ([65.55.34.145] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 3993188 for lml@lancaironline.net; Fri, 27 Nov 2009 18:21:58 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.55.34.145; envelope-from=bill_kennedy_3@hotmail.com Received: from COL108-W55 ([65.55.34.136]) by col0-omc3-s7.col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Fri, 27 Nov 2009 15:21:22 -0800 X-Original-Message-ID: X-Original-Return-Path: bill_kennedy_3@hotmail.com Content-Type: multipart/alternative; boundary="_80d1c996-6290-4fa3-b126-92300bad33e6_" X-Originating-IP: [75.164.136.162] From: Bill Kennedy X-Original-To: Subject: RE: [LML] Gear warning indicator X-Original-Date: Fri, 27 Nov 2009 15:21:22 -0800 Importance: Normal In-Reply-To: References: MIME-Version: 1.0 X-OriginalArrivalTime: 27 Nov 2009 23:21:22.0526 (UTC) FILETIME=[551007E0:01CA6FB8] --_80d1c996-6290-4fa3-b126-92300bad33e6_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Isn't the 12VDC coming through the light bulbs. I don't see a potential for= a short circuit. The circuit provides a ground path for the lights. > To:=20 > Date: Fri=2C 27 Nov 2009 08:40:07 -0500 > From: dfs155@roadrunner.com > Subject: [LML] Gear warning indicator >=20 > Excuse me!! This looks to have at least two design faults. >=20 > Problem 1: If the airspeed switch is closed and any one (or more) of the= =20 > green "down and locked" lights are energized via the gear position switch= es=2C=20 > 12 volts will be applied thru one or more of the diodes to this "blinker"= =20 > and it will try to operate - e.g.=2C the 1000 mike capacitor will charge = thru=20 > the 100 ohm resistor until the voltage reaches the relay pull-in voltage. >=20 > Problem 2: Unfortunately=2C as soon as the capacitor charges sufficiently= to=20 > pull in the relay=2C the relay contacts close and the 12 volts is shorted= =20 > directly to ground. Hopefully=2C only blowing a fuse or popping a breaker= =2C but=20 > effectively taking at least the gear light circuit down. >=20 > Neat! >=20 > Dan Schaefer >=20 > PS: Stick the resistor on the other side of the relay contacts to at leas= t=20 > solve the shorting - not sure what to do to keep this thing from blinking= =20 > the lights when at least one gear leg is down and locked. But what do I=20 > know? I'm just a retired EE and things have a way of getting fuzzy in 10= =20 > years! >=20 > DS=20 >=20 >=20 > --=20 > I am using the free version of SPAMfighter. > We are a community of 6 million users fighting spam. > SPAMfighter has removed 631 of my spam emails to date. > Get the free SPAMfighter here: http://www.spamfighter.com/len >=20 > The Professional version does not have this message >=20 >=20 >=20 > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.ht= ml = --_80d1c996-6290-4fa3-b126-92300bad33e6_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Isn't the 12VDC coming through the light bulbs. I don't see a potential for= a short circuit. The circuit provides a ground path for the lights.
>=3B To:
>=3B Date: Fri=2C 27 Nov 2009 08:40:07 -0500
>=3B Fr= om: dfs155@roadrunner.com
>=3B Subject: [LML] Gear warning indicator>=3B
>=3B Excuse me!! This looks to have at least two design faul= ts.
>=3B
>=3B Problem 1: If the airspeed switch is closed and an= y one (or more) of the
>=3B green "down and locked" lights are energi= zed via the gear position switches=2C
>=3B 12 volts will be applied t= hru one or more of the diodes to this "blinker"
>=3B and it will try = to operate - e.g.=2C the 1000 mike capacitor will charge thru
>=3B th= e 100 ohm resistor until the voltage reaches the relay pull-in voltage.
= >=3B
>=3B Problem 2: Unfortunately=2C as soon as the capacitor char= ges sufficiently to
>=3B pull in the relay=2C the relay contacts clos= e and the 12 volts is shorted
>=3B directly to ground. Hopefully=2C o= nly blowing a fuse or popping a breaker=2C but
>=3B effectively takin= g at least the gear light circuit down.
>=3B
>=3B Neat!
>= =3B
>=3B Dan Schaefer
>=3B
>=3B PS: Stick the resistor on = the other side of the relay contacts to at least
>=3B solve the short= ing - not sure what to do to keep this thing from blinking
>=3B the l= ights when at least one gear leg is down and locked. But what do I
>= =3B know? I'm just a retired EE and things have a way of getting fuzzy in 1= 0
>=3B years!
>=3B
>=3B DS
>=3B
>=3B
>= =3B --
>=3B I am using the free version of SPAMfighter.
>=3B We = are a community of 6 million users fighting spam.
>=3B SPAMfighter has= removed 631 of my spam emails to date.
>=3B Get the free SPAMfighter = here: http://www.spamfighter.com/len
>=3B
>=3B The Professional = version does not have this message
>=3B
>=3B
>=3B
>= =3B --
>=3B For archives and unsub http://mail.lancaironline.net:81/li= sts/lml/List.html
= --_80d1c996-6290-4fa3-b126-92300bad33e6_--