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Date: Fri, 27 Apr 2007 21:56:50 -0400
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From: "Bob B." <rbelshe@comcast.net>
Subject: RE: [LML] 12v supply to stabilize avionics
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In-Reply-To: <list-2014040@logan.com>

Bob,
Space is tight in a 235, but it sounds like a good idea.  Can you please
post the dimensions or a link to more information.
Thanks,
Bob Belshe
Moraga, CA
Lancair 235/320  
http://home.comcast.net/~rbelshe/ 

 
-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of bob
mackey
Sent: Friday, April 27, 2007 3:34 PM
To: lml@lancaironline.net
Subject: [LML] 12v supply to stabilize avionics

I am purchasing a 12V power supply that takes 6-24V input and gives 12V out
at up to 14 A continuous.
It's a 95% efficient switcher with a quiescent current around 10mA. We need
to buy ten of them to get a better price.

Why do I want one? Why might you want one?

I have a 1-battery airplane and don't want to rewire the whole thing. The
GPS and radios reboot if they are on when I start the engine. During
cranking, the bus voltage drops to around 10 V, and the avionics brown out.
I want that problem to go away, and also want to keep the radio working for
a while if the alternator shuts down and the battery drains below 10V.

So, the solution I am trying is a switching power supply that converts
anything between 6 and 24 V in to a stabilized 12V out.
with 95% efficiency, the lost power is minimal. We would like to buy 10
units for about $55 each (+ s/h). We've accounted for four units, so there
will be six more available. Who wants one?

-bob mackey


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