Re: Laptop AC Adaptors...

<rivest@xxxxxxxxx> wrote in message
news:1127839121.566637.249240@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I've always wondered why laptop AC adaptors are so bulky. I mean
> laptops are meant to be mobile and compact and light right? Anyhow, I
> came across this article where this guy made a hack to a tiny AC
> adaptor an successfully used it for his 16V laptop.
>
> http://www.fixup.net/tips/aps.htm
>
> Can anyone explain why the 16V limit and is there any way I can get 19V
> and perhaps 3amps?
>

There was another thread in the past few days that asked essentially the
same question about a desktop PC power supply. The answer here is the same
as in the orther thread.. . and that is the design of the power supply
itself is the limiting factor. The PSU was designed to perform within
certain limits. Those limits are imposed by the design and construction of
certain components in the PSU, the most obvious being the transformer (yes,
even switchers have a transformer). The turns ratio on the transformer says
that for a certain voltage imposed on the primary, you're only going to get
a secondary voltage that's set by the number of turns on the secondary.
Sometimes there may be enough "headroom" in the design to get just a little
more out, but not much more. And if you push it to the limits, you're
risking the possibility of destroying the unit and/or causing fire.
I guess you're like a lot of others on the newsgroups that want to get
something for nothing. If a PSU is designed to put out 30 watts, there's no
way you can make it give you 60 watts without major redesign and component
changes... making it much more expensive than just buying the appropriate
unit for the job you want to do.

Cheers!!!
--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!


.

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