Hi Tom, Hi Lefty, Hi Picbits, Hi Steveo,
I did consider making a device like 'Steveo' or possibly something
similar like an oscillator feeding a transformer outputting three or
four volts on a separate winding, to feed a diode bridge and cap,
which could be added to 12v to give me 15 or 16v for my laptop.
I reckoned that 3v at 2.5 Amps would need about 10 watts, maybe a
single transistor running a small transformer at about 18Kc might
do it. Didn't fancy a "buck inductor" circuit, looked a bit too
complicated to me ....
And yes, if i wanted a mains-voltage supply for additional reasons
then yes, i would take my inverter unit with me and use that, as
using an inverter to feed the laptops DC unit is perfectly acceptable
but i want something small just for this job.
Ive been in touch with the nearest Maplins, and they have these units
in stock for £9:99 GBP so i will be going over there tomorrow to get
one.
It will be unlikely to have the 'Dell Latitude' proprietory fitting
in its choice of fittings, so i will have to steal the one from the
latitude mains adapter.
Unless anyone knows where i can get one like it ... ?
And ive just remembered, i dont have a cigarette lighter point in my
car, so thats another job. Its fun like this that keeps me going ...
Cheers, John