> On Wed, 1 Sep 1999, Laurens Holst wrote:
>
>
> > someday in the future (don't know exactly when; in 2003 or so). Will
> this
> > have a bad effect on my MSX (will it last less long)??? And if the
> 'purple
> > corners'-problem is because of a too-low voltage... will the increase
> solve
> > my problem?
>
> I don't think it's possible. But if done, you'll have to exchange all of
> your equipment based on electric motors and transformers connected
> directly to the electric network. It would be too expensive! Other
> approach would be to connect a transformer to each electric/eletronic
> equipment that you have. Too expensive and too heavy!
>
Well...they're doing it gradually over a x-year period (1 volt a
year I thought).
Actually it's not that big a deal. It's a 4.5% raise. I don't know
what the guaranteed tolerances are, but
if they are able to decrease them, the upper limit could remain the
same.
Theoretically, equipment will last shorter, either because of the
extra heat generated, or because of the extra current.
A typical MSX has a linear power supply (normal transformer +
rectifier + capacitor + voltage regulators). This means a higher voltage
will be fed to the regulators. Say, the nominal regulator input is 8 Volts,
and the MSX draws 3 A current @ 5 Volt.
The heat that must be dissipated by the regulator is (8-5)*3 = 9
watts.
A 4.5% increase would yield 8.36 V on the input of the regulator.
This gives (8.36-5)*3=10.1 watts.
So for the 5 volt supply, 1.1 Watt of heat is added. The 12V supply
adds something as well, and the transformer itself and the rectifier will
also add some more heat.
Most (if not all) problems with electronic equipment will be more
heat in the power supply (and maybe more heat in the whole apparatus). Best
solution for a MSX would be to buy one of these cheap (PC) switch-mode power
supplies, they are non-linear and will consume LESS current if fed with a
higher voltage (V*I remains roughly the same). Some of them are rated for
100-240 volt without switching anything (like the charger for my camcorder).
Greetz,
Patrick
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