I'm not sure if you are stating that the external power adapter that comes
with the Sharps have special circuitry in them. But as far as I can tell they
are cheap bricks made in China.
I think that it has more to do with the voltage then the power supply.
I have had a constant on going argument with the owner of the now defunct
MiniDisc Now. He once sent me what he claimed was a "universal" adapter. It
is a cheap piece of crap from some off shore country.
It had a tiny selector on it that stated 100v/220/. I tried to explain to him
that this adapter was no better in the US then the original adapter that comes
with the Japanese domestic units.
He gave me some bullsh!t about having tested it. It was just that. I have
never owned a Sharp 702 or later Sharp model. But I do have a Denon 70P which
is a Sharp 200 clone.
If you try to use the adapter supplied with the unit where I live the unit
will not work. You get the word "power" on the LCD. Plugging a 100 volt
adapter into an outlet that can vary from 110 to 120 volts (I think that the
national average is about 117), is going to supply more voltage then the unit
can handle.
Perhaps on the newer units the circuitry is more forgiving. But not on the
old Sharp 200 (btw, this unit is in my humble opinion one of the best portable
recorders ever made-it may not have all of the bells and whistles of the newer
units but it is a well made, trouble free unit with excellent sound
reproduction.-Althought it comes with a a simple remote, I bought an LCD
remote for it. It's not back lit, but looks like it is of much better quality
then the current remotes. It is actually made of METAL. Not painted to try
and present a poor imitation of metal, like my Aiwa F70).
Larry
Graham Baker wrote:
> ----- Original Message -----
> From: James S. Lee <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Friday, 4 August 2000 11:16
> Subject: Re: MD: External MD Power Supply for 722
>
> >
> > Since I asked this question about the Radio Shack "Portable CD Player
> Power
> > Pack" (23-505) rechargeable lead battery, I have gone ahead and used it
> > with the 722. The unit functions quite well except that the "battery
> > charging" indicator never goes out. So it would seem that the internal
> > battery is not being charged, at least not effectively. So, does that
> mean
> > that it is possibly being discharged while the external battery (3 - 4.5
> > nominal voltage) is attached?
>
> No I don't think so. The connection between the external batteries and the
> internal one would at least have a diode in between to stop inter-action
> and I suspect it would be far more complex than that, using the voltage
> regulator chip to switch between battery supplies.
> The Sharp 701/702 voltage regulator chip is quite smart - it recognises
> different voltages from different sources (incl car jack) and controls it
> accordingly.
> I had the same problem with a RS 4.5v power pack - it would drive the
> player but not charge the battery.
> In the end I built a 5v regulated supply, using an ic and capacitor and
> fed this with 7.5v from the RS power pack. The 5v is rock solid and
> charges the battery perfectly.
> I have a circuit somewhere if you are interested, thanks to another (can't
> remember who) MD-L contributor.
>
> >
> > How does the Sharp prioritize battery drain anyway? If, for example, I
> have
> > the Sharp battery pack installed and a freshly charged internal battery,
> > which is the primary current supplier to the unit?
>
> If you have a charged internal cell and the external battery pack fitted
> the (701) recorder uses the internal supply first and then changes to the
> external supply, without stopping record or playback.
>
> GB
>
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