John H. Robinson, IV wrote:
Some devices can tollerate changes in voltage, polarity or phase
rotation (etc). I would not rely upon it.
I have an APC TravelPower power supply that can take 10-14vdc
(polarized), 110-120vac, or 220-240 vac all throught the same cord and
provides a selectable voltage for a laptop (15-20volts). The fact that
the device works with both ac and dc impressed me. Unfortunately, it
seems fairly inefficient; it gets quite a bit hotter than a normal power
supply. I also don't have a plug tip that is compatible with my current
laptop (Dell E1505). Come to think of it, it didn't work with my
previous laptop either (iBook G4, which was, as far as I remember, 24
volts). It worked fine with the IBM T42 before that, though.
I wish there was a single standard for laptop power supply connectors
and voltages. It would make everything a lot simpler. At least for low
power devices, USB is emerging as a quasi-de-facto standard. That
simplifies things a little bit.
-- Rick
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