Hi John
The reason why I asked the original question was I saw on Rob
Danielsons' info about Hi-MD's a section on DIY power supplies.
There were several on view, one showing 2 x D cells, 2 x AA cells and
yours showing 4 x AA rechargeable cells. Your rechargeable option
looked like a good idea, that was until I checked the voltage coming
out of my mains power supply for the MZ-NH900 which was 3.49 volts
under no load. The AA rechargeable cells are quoted as having
a 'voltage' of 1.2 volts, but measuring some freshly charged AA cells
they actually give 1.49 volts each under no load making 5.96 volts
for a 4 cell sled. So I began to wonder if in fact it would be OK to
actually go 2.47 volts over on the DC input to the MZ-NH900, some 70%
over voltage, even 3 cells would be almost a volt over.
Re-reading the spec sheet for the MZ-NH900 it only gives 3 volts DC
as the input voltage.
I re-checked the freshly charged batteries some 15 minutes after
coming off charge and they have fallen to 1.41 volts each under no
load, so 4 cells would now be 5.64 volts and 3 cells 4.23 volts, how
quickly they would drop to their supposed nominal voltage of 1.2
volts under load I don't know.
I was just concerned that I did not 'fry' the DC input of the NH900.
I knew of someone who tried powering one of the original MD machines
(Sony MZ-R3?) using a 6 volt lead acid battery, it was quoted as
being 6 volts DC in on the MD machine. Well there was apparently an
initial 'puff' of smoke from the unit and the display flashed
up 'over-voltage' but it carried on working for many years after
that, even off of his 6 volt lead acid battery!
So have you run your NH-700 using 4 x rechargeable cells with no ill
effects?
Phil
--- In "John Hartog"
<> wrote:
>
> Phil,
> Now rereading your original post, I see I overlooked you mentioning
> measuring 3.5 V on your power adapter. So I went back and
remeasured
> mine. The one I originally measured at 5.1V (model AC-ES305)I think
> came with my older MZ-N707 MD (not a HiMD). The one that came with
the
> HiMD RH10 (AC-ES3010K2) measures 3.4V, and the one that was supplied
> supplemental to the MZ-NH700 (AC-E30A) measured 3.3V.
>
> I was making my assumptions about HiMD powering based on an older
> power supply, and I appologize for steering anyone wrong.
>
> John Hartog
>
>
> --- In "macmang4125"
> <macmang4125@> wrote:
> >
> > Looking at Rob Danielson's excellent site I saw John Hartog's 4.8
volt
> > sled. Before I go and plug 4.8 volts into my NH900 I would like
> > reassurance that this is OK. As measuring the volts out of the
power
> > supply they are 3.5 volts, the extra 1.3 volts should not be a
> > problem. But I would hate for them to be my 'famous last words' :-
))
> >
> > Phil
> >
>
|