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From: "Schemmel, Grant" <Grant.Schemmel@Aeroflex.com>
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Digital Fuel Monitoring System
Date: Fri, 18 Feb 2005 06:56:19 -0700
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Hi Ed,
 
I wouldn't sweat the "resistor on legs" issue too much, it only becomes a vibration issue with parts that have a large mass.  I work for a company that builds space grade circuit cards, and used to work on PT6 fuel controls when I worked for Hamilton Standard, so I've seen typical construction for this kind of application.  If you are worried about axial leaded components, mount them close to the circuit card and put a dab of epoxy under them for bonding.
 
On an aside, I would appreciate a photo of your board emailed direct, as my workplace blocks all jpegs.
 
Thanks
 
Grant Schemmel

-----Original Message-----
From: Ed Anderson [mailto:eanderson@carolina.rr.com]
Sent: Friday, February 18, 2005 5:57 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Digital Fuel Monitoring System


Geez, Finn, I was unaware that there was a "protocol" for resistor sizes on PC boards.  Seriously, is there some reason (vibration?) for forcing resistors all the way to the board or is it just "esthetics?".
 
Ed A

----- Original Message ----- 
From: Finn  <mailto:finn.lassen@verizon.net> Lassen 
To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>  
Sent: Thursday, February 17, 2005 11:06 PM
Subject: [FlyRotary] Re: Digital Fuel Monitoring System

Nice.

I assume those resistors are just temporary until you get hold of smaller ones that can actually rest on the PCB rather than hanging in their legs? I know it's not flight critical, but still...

Finn

Ed Anderson wrote:


Here are a couple of photos of my homebrew digital fuel monitoring system, I have mentioned in the past (seems like I've been working on it forever).  Got the PC board in today and got it mostly populated with the components.  It will sit in a 2 1/4" instrument case with the LCD extending out past the boundary of the case.  I plan on trying some vacuum molding of thin ABS plastic to form a  attractive front cover.
 
The front panel shows the LCD display screen as well as the push buttons for loading fuel, setting alarms and selecting which screen you wish to display.  The center shaft controls the LCD backlite so it will be visible either in day or night.
 
Hopefully, I have designed and constructed the board properly (my first microcomputer/controller board) and if so, then the software (which I have completed)  will be loaded and it will be installed in the aircraft for testing.  I certainly plan on having it installed for Sun & Fun.
 
Ed
 


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<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff size=2>Hi 
Ed,</FONT></SPAN></DIV>
<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff size=2>I 
wouldn't sweat the "resistor on legs" issue too much, it only becomes a 
vibration issue with parts that have a large mass.&nbsp; I work for a company 
that builds space grade circuit cards, and used to work on PT6 fuel controls 
when I worked for Hamilton Standard, so I've seen typical construction for this 
kind of application.&nbsp; If you are worried about axial leaded components, 
mount them close to the circuit card and put a dab of epoxy under them for 
bonding.</FONT></SPAN></DIV>
<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff size=2>On an 
aside, I would appreciate a photo of your board emailed direct, as my workplace 
blocks all jpegs.</FONT></SPAN></DIV>
<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff 
size=2>Thanks</FONT></SPAN></DIV>
<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=255065013-18022005><FONT face=Arial color=#0000ff size=2>Grant 
Schemmel</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
  <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma 
  size=2>-----Original Message-----<BR><B>From:</B> Ed Anderson 
  [mailto:eanderson@carolina.rr.com]<BR><B>Sent:</B> Friday, February 18, 2005 
  5:57 AM<BR><B>To:</B> Rotary motors in aircraft<BR><B>Subject:</B> [FlyRotary] 
  Re: Digital Fuel Monitoring System<BR><BR></FONT></DIV>
  <DIV><FONT face=Arial size=2>Geez, Finn, I was unaware that there was a 
  "protocol" for resistor sizes on PC boards.&nbsp; Seriously, is there some 
  reason (vibration?) for forcing resistors all the way to the board or is it 
  just "esthetics?".</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
  <DIV><FONT face=Arial size=2>Ed A</FONT></DIV>
  <BLOCKQUOTE dir=ltr 
  style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
    <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
    <DIV 
    style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> 
    <A title=finn.lassen@verizon.net href="mailto:finn.lassen@verizon.net">Finn 
    Lassen</A> </DIV>
    <DIV style="FONT: 10pt arial"><B>To:</B> <A 
    title=flyrotary@lancaironline.net 
    href="mailto:flyrotary@lancaironline.net">Rotary motors in aircraft</A> 
    </DIV>
    <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, February 17, 2005 11:06 
    PM</DIV>
    <DIV style="FONT: 10pt arial"><B>Subject:</B> [FlyRotary] Re: Digital Fuel 
    Monitoring System</DIV>
    <DIV><BR></DIV>Nice.<BR><BR>I assume those resistors are just temporary 
    until you get hold of smaller ones that can actually rest on the PCB rather 
    than hanging in their legs? I know it's not flight critical, but 
    still...<BR><BR>Finn<BR><BR>Ed Anderson wrote:<BR>
    <BLOCKQUOTE cite=midlist-743794@logan.com type="cite">
      <META content="MSHTML 6.00.2800.1476" name=GENERATOR>
      <STYLE></STYLE>

      <DIV><FONT face=Arial size=2>Here are a couple of photos of my homebrew 
      digital fuel monitoring system, I have mentioned in the past (seems like 
      I've been working on it forever).&nbsp; Got the PC board in today and got 
      it mostly populated with the components.&nbsp; It will sit in a 2 1/4" 
      instrument case with the LCD extending out past the boundary of the 
      case.&nbsp; I plan on trying some vacuum molding of thin ABS plastic to 
      form a&nbsp;&nbsp;attractive front cover.</FONT></DIV>
      <DIV>&nbsp;</DIV>
      <DIV><FONT face=Arial size=2>The front panel shows the LCD&nbsp;display 
      screen as well as the push buttons for loading fuel, setting alarms and 
      selecting which screen you wish to display.&nbsp; The center shaft 
      controls the LCD backlite so it will be visible either in day or 
      night.</FONT></DIV>
      <DIV>&nbsp;</DIV>
      <DIV><FONT face=Arial size=2>Hopefully, I have designed and constructed 
      the board properly (my first microcomputer/controller board) and if so, 
      then the software (which I have completed) &nbsp;will be loaded and it 
      will be installed in the aircraft for testing.&nbsp; I certainly plan on 
      having it installed for Sun &amp; Fun.</FONT></DIV>
      <DIV>&nbsp;</DIV>
      <DIV><FONT face=Arial size=2>Ed</FONT></DIV>
      <DIV>&nbsp;</DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>

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