On 10/2/06, John H. Robinson, IV <[EMAIL PROTECTED]> wrote:
Carl Lowenstein wrote:
>
> Some laptops must be made to tolerate at least a 50% variation in
> input voltage, since they can run from either 6-cell or 9-cell battery
> packs.
But would you be willing to apply 150% rated voltage to any random
electrical device?
No, just to one that was rated for that kind of service.
Some devices can tollerate changes in voltage, polarity or phase
rotation (etc). I would not rely upon it.
Just to add fuel to the fire, I find on careful reading of the label
on my Thinkpad power supply that it is rated for input of 100 to 240
VAC, 50-60 Hz. No changing of switches or anything. Power supply
design for wide variation of input voltage has improved a lot in the
past couple of decades.
A quick Google browse turns up power supply chips that can provide 5 V
output over an input range of about 6 to 28 V. At least according to
my reading of the data sheet.
< http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3939 >
carl
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carl lowenstein marine physical lab u.c. san diego
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