[Soekris] Battery Power
joelja at darkwing.uoregon.edu
Wed Mar 3 02:01:43 UTC 2004
On Tue, 2 Mar 2004, Joel Dare wrote:
> At 12:10 PM 3/2/2004, you wrote:
> >I never tried it, but you might draw on other experience.
> >4*AA is 6 volts? Don't you need 12?
> >Please summarize. I know that I have a soekris project that
> >sometimes needs battery power.
> The Soekris specs say 5V DC fixed or 7-20V DC. I know nothing about
> electronics, but imagine that it's listed this way because of some
> convention rather than the actual allowable voltage. I'll probably burn my
> board up learning otherwise.
> In any case, 5V DC fixed usually is something like +/- 5%. At first
> glance, the Soekris seems to have a much better range than that. My
> batteries started at 5.8V and the board gave me an error LED when they got
> down to 5.5V. So, if I start at a higher voltage, given the lower amperage
> and allowable voltage drop, then it should work quite a bit
> longer. Unfortunately, NiMh D batteries are only a little better than NiMh
> AA batteries. In Alkaline's, there is a significant difference (speaking
> of the mAh ratings), so D Alkaline's would probably last 5 times as long as
> D NiMh's. If I could run the board on 8 AA's (12V) for a couple of hours,
> I would be happy.
> I am NOT using the NIC ports in my application, but I do need keyboard and
> sound support, which I haven't found yet.
> What I'm trying to do is create a computer that I can take to locations
> where I normally might not take a computer (because it's rude).
the smallest laptop I have (sony vaio u3) is a bit smaller than a 4521 or
4801 including the keyboard and display, the cost delta is quite a lot (I
picked it up for around $1000 used). I find it fairly unitrusive to use
since there's no huge display in front of you, but people allways want to
look at it because it's so small.
> The system
> would need a keyboard (likely a one-handed or small keyboard), and I would
> use it for taking notes. I'm a good typist and don't need really need a
> monitor, but sound feedback would also be a plus. I plan to write all the
> software myself, so I can choose any platform, and I'm kinda leaning toward
> FreeDOS right now.
I'm looking at the frogpad, I already have a half-keyboard, which works
ok, and the vaio has a complete if realtivly miniscule keyboard, it's far
and away better than trying to use the chicklet keyboard on a zaurus or a
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Joel Jaeggli Unix Consulting joelja at darkwing.uoregon.edu
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