8423Re: [tracker2] Re: 5v buck converter?
- Sep 1, 2009On Tue, Sep 1, 2009 at 7:30 PM, Lynn W. Deffenbaugh
> And with 12v vehicle power, the efficiency isn't much of a concern,Not exactly.
I used a 7805 to drive a power hog of an old GPS in my old truck. The
battery (yeah, big honkin' full sized pickup truck battery) lasted
longer after I stopped operating it 24x7. I don't have data on it,
but someone made the convincing claim that it would shorten the
vehicle battery life, that clicked with the shorter-than-expected life
of my truck battery, and I got an APO. That was the last battery I
bought before I traded the vehicle.
The drain is related to current draw (my APO uses a little 7805, and
it has no noticeable effect), but I suspect a larger draw like the
~400mA the original poster mentioned would result in detectable
shortening of the battery life.
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