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<font size="+1">You could put a small resister in parallel with the
regulater to carry part of the 140 ma...<br>
Tad<br>
</font><br>
Larry Cerney wrote:<br>
<blockquote type="cite"
cite="mid200412010134.iB11YrBU026004@spring.viawest.net">
<pre wrap="">Jason,
I tried to use the 78L05 on the open tracker which worked to power a Deluo
GPS. The max I rating for the '05 is 140 mA and running the GPS (140 mA)
caused the 78L05 to get too hot for my liking. So, what I did was to move a
7805 off to the side just for powering the GPS. I took the input power from
the OpenTracker and connected the output of the 7805 to Pin 10 on the Jumper
Header which goes to Pin 4 of the DB9 connector.
Another option is to use the Garmin 18 with pigtails. The Garmin 18 draws
~65 mA and could be easily powered from the OpenTracker's 78L05.
I didn't go that route because after thinking about it I came to the
conclusion that it didn't make any sense to pay $80 to keep a $0.25 part
from burning up, duh....
BTW, I put the OpenTracker into a little Radio Shack project box, 2"x3", and
it fits great sideways with the DB9 connectors hanging out. I drilled a
hole to put the power in through a grommet for strain relieve. I drilled a
little hole above the LED so I could see what the OT was doing. Came out
great.
73..
Larry
"The only reason for time is so that everything doesn't happen at once."
--Albert Einstein
-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:aprssig-bounces@lists.tapr.org">aprssig-bounces@lists.tapr.org</a> [<a class="moz-txt-link-freetext" href="mailto:aprssig-bounces@lists.tapr.org">mailto:aprssig-bounces@lists.tapr.org</a>]
On Behalf Of Jason Winningham
Sent: Tuesday, November 30, 2004 5:59 PM
To: TAPR APRS Mailing List
Subject: [aprssig] power on DB9 connector standard for trackers?
Is there a standard for a tracker supplying power to a GPS via a DB9
pin?
For example, the Opentracker has a jumper to pass Vin from pin 7 on the
radio side DB9 to pin 4 on the GPS DB9, but this appears to be
unregulated.
I thought I remembered a reference to a regulated voltage on pin 9, but
I can't find it now.
It's not a big deal, but while I'm building a tracker housing and GPS
cables, I figure I may as well adhere to a standard if there is one.
-Jason
kg4wsv
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</pre>
</blockquote>
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