James Jarvie wrote:
> >From what I have read in these pages, and you
> discovered this yourself, the Sharp will play using a
> 4.5 volt input, but will not charge. Also, 6 volts is
> too much for a Sharp 5 volt unit. I tried to run my
> MD with a 6 volt unit (not realizing it). Thankfully,
> the MD unit shut itself off, rather than allowing
> itself to be damaged.
> Do yourself a favour and seek out a 5 volt adaptor if
> you need to charge the unit. Some previous posts gave
> some ideas how to obtain one.
>
> James
The Sharp units are very voltage sensitive. When I used to work for a company that
imported MD stuff, we always included a
stepdown transformer with the units (the standard voltage in Japan is 100 volts, as
most of you know).
So plugging their AC adapter into the 110-120 volts of the US (I understand it varies
in different parts of the country and the
"average" is supposed to be about 117) would yield a net output of more than Sharp's
required 5 volts.
But the Sharps seem to have some kind of protection circuit in them. I once forgot
the use the stepdown transformer and the LCD
displayed "POWER?", then turned the unit off.
5 volts is not a "normal" standard for AC adapters. The adapters usually correspond
to batteries. If a unit would take 2
batteries, the adapter would be 3 volts and so on in increments of 1.5 volts.
I have never seen a multi voltage adapter that had a 5 volt setting on it. It is also
sometimes hard to find AC adapters that are
500 milli amps or more. I don't know about the newest portables, but in the past
units came with AC adapters that were 500 ma.
The rule that I was taught on this site is that more amps are OK, but less will damage
your equipment.
AA batteries are over 1000 ma. In batteries, Milli amps seems to have a direct
correlation to the length of time the battery will
last (of course it depends upon the demand characteristics of the equipment that you
use-My digital still camera will go through
Alkaline batteries like crazy. But lower voltage, lower amperage NiMH rechargeable
batteries actually last longer)
Lawrence
>
>
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