Laptop battery charger

V

Vidor Wolf

Guest
Over the next 4 day Easter weekend, I'll be in a place with no electricity
except the car.
I have an iBook that uses a 24V 3A PSU/Charger.
Can I use the car cigarette lighter socket to charge the laptop battery?
(Not run the laptop)
I was going to use a 27Ohm 3 Watt resistor to limit the current (it's what's
in my bits box) and feed this into a regulator (LM317T) to give me 12V at
around 500mA.
For the use it would get, I don't want to have to buy a car adapter and just
want a quick fix to recharge the battery a few times.
Many thanks.
Mark H.
 
get an inverter... generally available from trucking stores, they convert
12/24V (most are dual voltage) to mains... lets truckers run mains TVs and
other mains devices (within reason... no kettles please) in their cabs when
parked up overnight. Belkin do a couple and they aren't expensive; Ł50 ish
with the VAT (from expansys
http://www.expansys.com/product.asp?code=108531 ) This is not a bad way to
go as it opens up a whole scope of things that normally run on mains to
suddenly become portable, and it is future-proof.

You can also find a range of switched mode DC-DC converters - I have one
which does 21v from a fag-lighter socket (soon to be downed to 15V for my
new Toshiba)

Question: if you are in a place with no leccy, hadn't you better get in the
spirit of things and leave the laptop behind? think of all the healthy
down-to-earth things you could be doing... like.... erm..... ..... .. well
there's, um.... Yeah. I see your point :eek:)

oh well... UT2004 it is then, It is cold and drizzley after all...

HTH


"Vidor Wolf" <joannehales@spammenothales74.freeserve.co.uk> wrote in message
news:c4uvf0$n7t$2@news6.svr.pol.co.uk...
Over the next 4 day Easter weekend, I'll be in a place with no electricity
except the car.
I have an iBook that uses a 24V 3A PSU/Charger.
Can I use the car cigarette lighter socket to charge the laptop battery?
(Not run the laptop)
I was going to use a 27Ohm 3 Watt resistor to limit the current (it's
what's
in my bits box) and feed this into a regulator (LM317T) to give me 12V at
around 500mA.
For the use it would get, I don't want to have to buy a car adapter and
just
want a quick fix to recharge the battery a few times.
Many thanks.
Mark H.
Click to expand...
 
Cheers.
I was only going to make the charger as I had the parts and an idea.
As it is, we've now gone for a 300W inverter from "Sorry we don't stock that
item at this store Sir" Maplins in Eltham, London for 40 quid (30 quid for
the 150W model.)
It's not a true sinewave model, but appears to do what we want.
And yes, it does a lot more as well.
As for alternatives in a place where there's no sparks, 22 years on... Nah!!
:eek:)
Thanks for the reply.
Mark H.

"UncleWobbly" <hendy@talk21.com> wrote in message
news:4077f0dd$0$31715$fa0fcedb@lovejoy.zen.co.uk...
get an inverter... generally available from trucking stores, they convert
12/24V (most are dual voltage) to mains... lets truckers run mains TVs and
other mains devices (within reason... no kettles please) in their cabs
when
parked up overnight. Belkin do a couple and they aren't expensive; Ł50 ish
with the VAT (from expansys
http://www.expansys.com/product.asp?code=108531 ) This is not a bad way
to
go as it opens up a whole scope of things that normally run on mains to
suddenly become portable, and it is future-proof.

You can also find a range of switched mode DC-DC converters - I have one
which does 21v from a fag-lighter socket (soon to be downed to 15V for my
new Toshiba)

Question: if you are in a place with no leccy, hadn't you better get in
the
spirit of things and leave the laptop behind? think of all the healthy
down-to-earth things you could be doing... like.... erm..... ..... ..
well
there's, um.... Yeah. I see your point :eek:)

oh well... UT2004 it is then, It is cold and drizzley after all...

HTH


"Vidor Wolf" <joannehales@spammenothales74.freeserve.co.uk> wrote in
message
news:c4uvf0$n7t$2@news6.svr.pol.co.uk...
Over the next 4 day Easter weekend, I'll be in a place with no
electricity
except the car.
I have an iBook that uses a 24V 3A PSU/Charger.
Can I use the car cigarette lighter socket to charge the laptop battery?
(Not run the laptop)
I was going to use a 27Ohm 3 Watt resistor to limit the current (it's
what's
in my bits box) and feed this into a regulator (LM317T) to give me 12V
at
around 500mA.
For the use it would get, I don't want to have to buy a car adapter and
just
want a quick fix to recharge the battery a few times.
Many thanks.
Mark H.
Click to expand...
 
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