X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 1000643 for flyrotary@lancaironline.net; Mon, 27 Feb 2006 20:03:03 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-01-eri0.southeast.rr.com (8.13.4/8.13.4) with SMTP id k1S12HDj011766 for ; Mon, 27 Feb 2006 20:02:19 -0500 (EST) Message-ID: <005701c63c02$576202c0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fire Detector Unit Date: Mon, 27 Feb 2006 20:00:17 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0054_01C63BD8.6E3639A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0054_01C63BD8.6E3639A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Apparently the pulse duration can be stretched for close to an hour by = adding the correct size capacitor, but a latching circuit would be a = nicer way to go. Ed ----- Original Message -----=20 From: Wendell Voto=20 To: Rotary motors in aircraft=20 Sent: Monday, February 27, 2006 7:55 PM Subject: [FlyRotary] Re: Fire Detector Unit ----- Original Message -----=20 From: Mark R Steitle=20 To: Rotary motors in aircraft=20 Sent: Monday, February 27, 2006 8:46 AM Subject: [FlyRotary] Re: Fire Detector Unit If Acroname.com has the inventory on hand (no reason to think otherwise), it looks to be a good source for the UVTRON fire = detectors and circuit boards. The question is can it run a good sized LED = without needing a relay board. Output is 50v, so that would have to be = dealt with (following Ed's recommendations). So, it appears that a relay board won't be necessary unless you're planning on using a landing = light as a warning indicator. The C3704 is rated for 10 - 30 volts input, = so that eliminates the need for the voltage converter board. They have = two other models if you need a different input voltage. The board would need to be mounted in a project box (readily available at Frye's) = with a window cut for the UVTRON to look through. I used nylon screws from = the Home Depot avionics department to mount the board.=20 From the picture on the Acroname web site, it doesn't appear that = the board is protective coated. IMHO, this should be done to improve longevity and reliability. The coating should be available from a number of electronics suppliers, or use something like epoxy resin = or E6000. =20 One other caution, the UVtron operates at 350v, so be careful = handling it while it is powered up. All in all, it appears the single-board solution would be a more = elegant solution, but would require some experimenting to get it to do what = we want. We know that the 3-board solution works as is. So, its up to each to determine which option suits your needs. Since Bob Darrah had indicated he was interested in this item, he's agreed to order one of the boards and we will test it out to see if = it will power an LED, and what additional components it needs to make = that happen. I will report back to the group with the good, the bad and = the ugly. =20 Mark =20 I agree that a relay board would not be needed (I didn't even see it = on the web site), however, it appears to me that it only puts out a = single pulse which can be stretched by adding a capacitor. If you = wanted more on time a latching circuit would be needed depending on your = alarm circuitry. An led could be driven off the open collector out put = but on time would be limited by the length of the pulse, hence the need = for a latching circuit. That's the way I see it. Wendell ------=_NextPart_000_0054_01C63BD8.6E3639A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Apparently the pulse duration can be stretched = for close=20 to an hour by adding the correct size capacitor, but a latching circuit = would be=20 a nicer way to go.
 
Ed
----- Original Message -----
From:=20 Wendell = Voto=20
Sent: Monday, February 27, 2006 = 7:55=20 PM
Subject: [FlyRotary] Re: Fire = Detector=20 Unit

 
----- Original Message -----
From:=20 Mark R Steitle =
To: Rotary motors in = aircraft=20
Sent: Monday, February 27, = 2006 8:46=20 AM
Subject: [FlyRotary] Re: Fire = Detector=20 Unit

If Acroname.com has the inventory on hand (no reason to=20 think
otherwise), it looks to be a good source for the UVTRON = fire=20 detectors
and circuit boards.  The question is can it run a = good=20 sized LED without
needing a relay board.  Output is 50v, so = that=20 would have to be dealt
with (following Ed's = recommendations).  So,=20 it appears that a relay
board won't be necessary unless you're = planning=20 on using a landing light
as a warning indicator.  The C3704 = is rated=20 for 10 - 30 volts input, so
that eliminates the need for the = voltage=20 converter board.  They have two
other models if you need a = different=20 input voltage.  The board would
need to be mounted in a = project box=20 (readily available at Frye's) with a
window cut for the UVTRON to = look=20 through.  I used nylon screws from the
Home Depot avionics=20 department to mount the board.

From the picture on the = Acroname web=20 site, it doesn't appear that the
board is protective = coated.  IMHO,=20 this should be done to improve
longevity and reliability.  = The=20 coating should be available from a
number of electronics = suppliers, or=20 use something like epoxy resin or
E6000. 

One other = caution,=20 the UVtron operates at 350v, so be careful handling
it while it = is=20 powered up.

All in all, it appears the single-board solution = would be=20 a more elegant
solution, but would require some experimenting to = get it=20 to do what we
want.  We know that the 3-board solution works = as=20 is.  So, its up to
each to determine which option suits your = needs.

Since Bob Darrah had indicated he was interested in = this item,=20 he's
agreed to order one of the boards and we will test it out to = see if=20 it
will power an LED, and what additional components it needs to = make=20 that
happen.  I will report back to the group with the good, = the bad=20 and the
ugly. 

Mark
   
I agree that a relay board would not be needed (I = didn't even=20 see it on the web site), however, it appears to me that it only puts = out a=20 single pulse which can be stretched by adding a capacitor.  If = you=20 wanted more on time a latching circuit would be needed depending on = your=20 alarm circuitry. An led could be driven off the open collector out = put but=20 on time would be limited by the length of the pulse, hence the need = for a=20 latching circuit.  That's the way I see it.
Wendell
 
------=_NextPart_000_0054_01C63BD8.6E3639A0--