On Fri, 4 Jul 2008 22:55:57 +0200, "Linea Recta"
<mccm.vos@abc.invalid> wrote:

>"Charlie Hoffpauir" <invalid@invalid.com> schreef in bericht
>news:7grs645k21dvnakrsqaifo7n3n744uf981@4ax.com.. .
>> On Fri, 4 Jul 2008 19:19:45 +0200, "Linea Recta"
>> <mccm.vos@abc.invalid> wrote:
>> <snip>
>>>
>>>Just curious about the principle, how DC to AC could work. But I think I
>>>have found some info in the meantime...
>>
>> In the most basic case, simply reverse the polarity of the DC 60 times
>> every second, and you get a square wave that for many purposes is
>> equivalent to 60 cycle AC.
>
>
>50 Hz I think, for my country?
>
>
>Various means can (if needed) be used to
>> smooth the wave to make it more like a proper AC sine wave, but for
>> most purposes the sq wave does the job.
>
>
>So proper sine wave is not essential for notebooks? They are cheaper...

No, that's not the issue. Remember that your (and most notebooks) have
a device between the AC mains and the notebook. This device is a
transformer to convert the AC 120v (or whatever you have.... many work
on a wide range of input voltages) to the proper voltage level for
your laptop (perhaps around 17 v,and recitify it back to DC. The sq
wave voltage that is the input is OK since it is transformed and then
rectified again. That's essentially what takes place in one of the
small devices that takes DC in at 12 v and produces DC out at 17 v.,
except I'd guess it's done with solid state devices rather than with
transformers and rectifiers. That's why a DC to 120 v AC device works
OK to power your laptop... even tho the AC it produces may be very
"dirty" and not look very much like a sine wave, it's OK for use in
that device on your laptop cord that actually produces the 17 (or
whatever) V DC.

--
Charlie Hoffpauir
http://freepages.genealogy.rootsweb.com/~charlieh/

"Pete D" <no@email.com> wrote in message
news:486d3aa0$0$3058$5a62ac22@per-qv1-newsreader-01.iinet.net.au...

> ??? Well that is a first, no DC input, what does it run on, water? This is
> an unusual laptop indeed.

It runs on BATTERIES, Stupid! :p

Cheers!
--
Vig

>>
>> ??? Well that is a first, no DC input, what does it run on, water? This
>> is an unusual laptop indeed.
>
>
> You're right, my stupid mistake! It has a DC power connector for the mains
> adaptor (19V).
>

Anyway I have two different converters for laptops so they can run off 12
volts, one from Targus, 19 volts only and one from Kerio that adjusts from
15-24 volts, these units are small light and just work. Most shops that sell
laptops will sell them.

Cheers.

Pete

I don't think this is available!
anyway,if you wanna know more about laptop power.
those blog may help you:

NetBook Review

Laptop Battery Talk

Laptop Battery blog life science with laptop battery