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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
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 -----
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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