[ltp] car and airplance adapter

[James Knott]

Eben King wrote:
> On Sat, 6 Nov 2004, invisibleghost wrote:
> 
> 
>>Does anyone know where i can find a airplane and car
>>adapter for my ibm r50e do they make it for that laptop?
> 
> 
> I have an AC/DC adapter for my T40 (16 VDC, 4.55A).  Is it different?  
> (Check your AC adapter.)  BTW, anybody know how they raise the voltage for
> DC?
> 

They'd use a DC-DC converter.  The incoming power is converted to AC (at 
a frequency much higher than normal power line AC), passed through a 
transformer to increase the voltage and then rectified & regulated, to 
produce the desired output.  That sort of thing is very easy to do and 
common these days.  Even desktop computer power supplies work the same way.