Article: 103121 of sci.geo.satellite-nav
From: see.my.sig@bigpond.com (Noel Bachelor)
Newsgroups: sci.geo.satellite-nav
Subject: Re: 60C/60CS External Supply
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On or about Tue, 17 Feb 2004 01:19:31 +0100, Carsten Kurz allegedly wrote:

>  If Garmin uses the same DC/DC block as in other current similiar models
>  like the 72 and 76, then it will probably work up from about 7 to 7.5
>  volts.
>  
>  I guess you can easily get a good idea on the tolerance if you try to
>  stack up a number of AA batteries, beginning with 4 or 5, while watching
>  the battery/external power indicator. I wouldn't really use the lowest
>  possible value, but add another 1.2/1.5V cell to be on the safe side.
>  
>  If your technical equipment allows, you can use a variable voltage
>  source and a current meter. I'd say, as long as the current/voltage
>  proportion stays on a line, everything should be fine. If the current
>  rises or lowers considerably at a certain voltage, I would not go below
>  that value.

And then divide that by the minimum usable cell voltage (for the sort of
batteries you'll be using) to get the number of cells you need.

Noel Bachelor noelbachelorAT(From:_domain)
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