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Old 09-22-2005, 11:01   #1 (permalink)
MVP
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OT(ish): Powering a Laptop

Powering a Laptop.
My Laptop (acer), according to the info on the mains adapter, runs on
19v DC.
Questions...

What are the chances it's be happy on 14vDC (which is the voltage
accross my battery 99% of the time)?

If it'll be happy with 14vDC would the delivery of it in a cars
electrical system be nice and smooth enough?

If it'll not be happy with 14vDC how easy is it to find a 1:1.357
ratio transformer to step-up the voltage?

And would that work?

The output of the mains transformer is 3.42A by the way, so the
current draw of a transformer for 14-19v would be 3.88A.

Anything here I've missed folks? or am I completely off my rocker
here?

--
Mark.
www.markvarleyphoto.co.uk
www.mvp-fine-art.co.uk
www.4x4info.info
www.shoot-to-thrill.com



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Old 09-22-2005, 12:01   #2 (permalink)
steve Taylor
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Re: OT(ish): Powering a Laptop

MVP wrote:
> Powering a Laptop.
> My Laptop (acer), according to the info on the mains adapter, runs on
> 19v DC.
> Questions...
>
> What are the chances it's be happy on 14vDC (which is the voltage
> accross my battery 99% of the time)?

Not good.

> If it'll be happy with 14vDC would the delivery of it in a cars
> electrical system be nice and smooth enough?

There can be very nasty transients on it.

>
> If it'll not be happy with 14vDC how easy is it to find a 1:1.357
> ratio transformer to step-up the voltage?
>
> And would that work?
> ................................................................


No, you can't use transformers for DC !

You can get laptop in-car PSUs from Maplin
http://www.maplin.co.uk/Module.aspx?...6989&doy=22m9D

Steve
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Old 09-22-2005, 12:01   #3 (permalink)
Dougal
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Re: OT(ish): Powering a Laptop

steve Taylor wrote:

> MVP wrote:
>
>>Powering a Laptop.
>>My Laptop (acer), according to the info on the mains adapter, runs on
>>19v DC.
>>Questions...
>>
>>What are the chances it's be happy on 14vDC (which is the voltage
>>accross my battery 99% of the time)?

>
> Not good.
>
>
>>If it'll be happy with 14vDC would the delivery of it in a cars
>>electrical system be nice and smooth enough?

>
> There can be very nasty transients on it.
>
>>If it'll not be happy with 14vDC how easy is it to find a 1:1.357
>>ratio transformer to step-up the voltage?
>>
>>And would that work?
>>................................................................

>
> No, you can't use transformers for DC !
>
> You can get laptop in-car PSUs from Maplin
> http://www.maplin.co.uk/Module.aspx?...6989&doy=22m9D
>
> Steve


Alternatively use an simple inverter (Maplins have several) and use it
to power your normal mains adaptor. This is potentially more flexible
than the dedicated laptop PSU as it can also power other mains apparatus.
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Old 09-22-2005, 12:01   #4 (permalink)
Lee_D
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Re: OT(ish): Powering a Laptop

"MVP" <mr.nice@*nospam*softhome.net> wrote in message
news:oup5j1dilbqdbrgsj5thfvile9g6oe3kbt@4ax.com...
> Powering a Laptop.
> My Laptop (acer), according to the info on the mains adapter, runs on
> 19v DC.
> Questions...


STOP!


go to Maplins, they do a nice car laptop adapter, kicks out the right
voltage and ampage. We run out Acer 270 Travel mate on it no problem.

I lied...we blew a fuse trying to run too much off the ciggy socket. Fitted
an Additional socket for the Kids in the back and been fine since.

The DVD player, surround system, x box, food blender , coffee maker, night
light, microwvae and Plug in air freshner may have been asking a bit much
;0)

http://www.maplin.co.uk/Module.aspx?...2622&doy=22m9D


Lee D


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Old 09-22-2005, 13:01   #5 (permalink)
Dave Liquorice
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Re: OT(ish): Powering a Laptop

On Thu, 22 Sep 2005 18:39:04 +0100, MVP wrote:

> What are the chances it's be happy on 14vDC (which is the voltage
> accross my battery 99% of the time)?


It might be, you need to look at the spec of the laptop.

> If it'll be happy with 14vDC would the delivery of it in a cars
> electrical system be nice and smooth enough?


Car electrical systems are noisy and very variable.

> If it'll not be happy with 14vDC how easy is it to find a 1:1.357
> ratio transformer to step-up the voltage?
>
> And would that work?


Transformers don't work on DC...

I think your best bet would be a small invertor to generate "mains"
and use that to power the normal laptop PSU.

--
Cheers new5pam@howhill.com
Dave. pam is missing e-mail



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Old 09-22-2005, 13:02   #6 (permalink)
Alex
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Re: OT(ish): Powering a Laptop

On Thu, 22 Sep 2005 18:39:04 +0100, MVP <mr.nice@*nospam*softhome.net>
wrote:

>Powering a Laptop.
>My Laptop (acer), according to the info on the mains adapter, runs on
>19v DC.
>Questions...
>
>What are the chances it's be happy on 14vDC (which is the voltage
>accross my battery 99% of the time)?
>
>If it'll be happy with 14vDC would the delivery of it in a cars
>electrical system be nice and smooth enough?
>
>If it'll not be happy with 14vDC how easy is it to find a 1:1.357
>ratio transformer to step-up the voltage?
>
>And would that work?
>
>The output of the mains transformer is 3.42A by the way, so the
>current draw of a transformer for 14-19v would be 3.88A.
>
>Anything here I've missed folks? or am I completely off my rocker
>here?


Yes. Go and buy a small inverter to power the mains adaptor. It solves
all your problems and also prevents nasty spikes from your car
electrical system killing the laptop internal PSU.

Alex
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Old 09-22-2005, 13:02   #7 (permalink)
GbH
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Re: OT(ish): Powering a Laptop

In news:oup5j1dilbqdbrgsj5thfvile9g6oe3kbt@4ax.com,
MVP <mr.nice@*nospam*softhome.net> blithered:
> Powering a Laptop.
> My Laptop (acer), according to the info on the mains adapter, runs on
> 19v DC.
> Questions...
>
> What are the chances it's be happy on 14vDC (which is the voltage
> accross my battery 99% of the time)?
>
> If it'll be happy with 14vDC would the delivery of it in a cars
> electrical system be nice and smooth enough?
>
> If it'll not be happy with 14vDC how easy is it to find a 1:1.357
> ratio transformer to step-up the voltage?
>
> And would that work?
>
> The output of the mains transformer is 3.42A by the way, so the
> current draw of a transformer for 14-19v would be 3.88A.
>
> Anything here I've missed folks? or am I completely off my rocker
> here?


Think the answer to all your questions is unfortunately no.

It is unlikely to be happy with a mere 14V if it is anticipating 19.
You can't 'transform' DC, only AC.
For DC you need and invertor, I don't see why such a beast shouldn't do 14 up to
19, however acquiring one might be a bit of a challenge.
Dunno what Maplin do in that line. It might be easier to get one that produces
240V AC from 12V DC and drive your AC adapter from that, them's more common and
more readily available from the likes of Maplin. They might even be available from
your caravan/camper suppliers.

As to your last statement, you post in alt.fan.landrovers and you need to ask?


--
"He who says it cannot be done should not interrupt her doing it."

If at first you don't succeed,
maybe skydiving's not for you!


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Old 09-22-2005, 15:01   #8 (permalink)
MVP
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Re: OT(ish): Powering a Laptop

On Thu, 22 Sep 2005 18:39:04 +0100, MVP <mr.nice@*nospam*softhome.net>
wrote:

>Powering a Laptop.
>My Laptop (acer), according to the info on the mains adapter, runs on
>19v DC.
>Questions...
>
>What are the chances it's be happy on 14vDC (which is the voltage
>accross my battery 99% of the time)?
>
>If it'll be happy with 14vDC would the delivery of it in a cars
>electrical system be nice and smooth enough?
>
>If it'll not be happy with 14vDC how easy is it to find a 1:1.357
>ratio transformer to step-up the voltage?
>
>And would that work?
>
>The output of the mains transformer is 3.42A by the way, so the
>current draw of a transformer for 14-19v would be 3.88A.
>
>Anything here I've missed folks? or am I completely off my rocker
>here?


Cheers fellas, Maplin it is then :oD

--
Mark.
www.markvarleyphoto.co.uk
www.mvp-fine-art.co.uk
www.4x4info.info
www.shoot-to-thrill.com



.................................................................
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>>>> at http://www.TitanNews.com <<<<

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Old 09-23-2005, 02:01   #9 (permalink)
Austin Shackles
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Re: OT(ish): Powering a Laptop

On or around Thu, 22 Sep 2005 19:42:02 +0100, "Lee_D"
<newsgroupNOSPAM@NOSPAMlrproject.com> enlightened us thusly:

>I lied...we blew a fuse trying to run too much off the ciggy socket. Fitted
>an Additional socket for the Kids in the back and been fine since.


fuse that feeds the faglightersocket in Edward keeps blowing, I reckon
metallic stuff creeps up behind the socket in the dash tray and shorts it
out, but I've never caught it in the act.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Appearances: You don't really need make-up. Celebrate your authentic
face by frightening people in the street.
from the Little Book of Complete B***ocks by Alistair Beaton.
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Old 09-23-2005, 02:01   #10 (permalink)
Fred Labrosse
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Re: OT(ish): Powering a Laptop

GbH wrote:

> You can't 'transform' DC, only AC.


Well, actually this is not entirely true. You can buy what is called DC-DC
converters That will do exactly that. We have some mobile robots running
on 12V equipped with such converters that do produce 24V (out of the 12V)
to power fairly power hungry equipment (big laser range scanners).

And this is probably what the maplin device uses.

Hope this helps.

Fred

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