DC/DC Laptop

Archived from groups: comp.sys.laptops (More info?)

I use a laptop in my truck
which has 24v electrics, i am trying to run a laptop that uses 19v.
In order to eliminate an inverter is there some kind of dropper that
will drop it down to 19v? Any help is most appreciated

Archived from groups: comp.sys.laptops (More info?)

bobb wrote:
> On 5 Mar 2005 21:38:57 -0500,
> davemiracleman@tiscali.co-dot-uk.no-spam.invalid (davemiracleman)
> wrote:
>
>
>>I use a laptop in my truck
>>which has 24v electrics, i am trying to run a laptop that uses 19v.
>>In order to eliminate an inverter is there some kind of dropper that
>>will drop it down to 19v? Any help is most appreciated
>
>
>
> Yes, but most universal adapters take the standard 12v. U may go to a
> trucker-specific forum, am sure members there bumped into this dilema
> before.
>
> An electronics-savvy buddy should be able to build you a 24v to 19v
> converter very cheapy.

Make sure your electronics-savvy buddy is also laptop power supply savvy
and auto electrical system savvy. It's often a LOT more complicated
than just generating a voltage. Based on what I've read here, 112% of
the people who contemplate doing this would blow up their laptop.
205% of those offering advice were dead wrong...emphasis on the
dead...as in dead laptop.

mike



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Archived from groups: comp.sys.laptops (More info?)

The truck's DC power bus has too many spikes on it from when major
inductive loads cut in and out to allow it to be safely used directly.
And the power requirements are way too high for a linear regulator.
Therefore, an inverter is your best choice, or a DC-DC converter (e.g.
auto/air power supply) that can tolerate a 24 volt input rather than the
more common 12 volt input.


davemiracleman wrote:
> I use a laptop in my truck
> which has 24v electrics, i am trying to run a laptop that uses 19v.
> In order to eliminate an inverter is there some kind of dropper that
> will drop it down to 19v? Any help is most appreciated
>

Archived from groups: comp.sys.laptops (More info?)

Yes, if you have 12 volts DC available, you can use that as the input to
a standard auto adapter. Be sure, however, that you have enough
current, because some modern laptops will draw over 10 amps -- perhaps
even 15 amps -- from the 12 volt input.


davemiracleman wrote:

> I have a 12volt dropper in my truck that goes from 24 volt to 12
> volt,
> I have seen on e-bay a device that steps up from 12volt to 19volt.
> Would this work?
>