----- Original Message -----
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.
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.
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.
Mark
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