Subject:
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Re: recharging NXT battery block with DC adapter?
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Thu, 20 Dec 2007 12:44:31 GMT
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Viewed:
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29390 times
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In lugnet.robotics.nxt, Brian Davis wrote:
> In lugnet.robotics.nxt, Pavel Petrovic wrote:
>
> > recharging a NXT battery block using 9V or
> > 12V DC adapter is a bad or good idea, please?
>
> I'd say a bad idea, since it's supposed to be supplied with 9-12V *AC* (not DC)
> power. Like the RCX 1.0, it might work under a DC supply... but that's not what
> it was designed for.
The reason asking is that sometimes we send teams of students to a country
with different voltage in the outlet, i.e. 110V instead of 220V, and the
LEGO adapter accepts 220V, but not 110V. However, we have a DC adapter
that accepts both 110V and 220V thus we could save on the converter,
if DC would work (not as permanent solution, but at least occassionally).
Thanks for replying though. My guess is that the only issue would be the
diodes in the rectifier that they get 100% instead of 50% duty, and that they
should still handle it, but it is only a guess since we do not see inside
of the battery block. I was wondering if anybody knows what is inside of the
battery block, and whether it is the only issue - because then if it works, it
would have no damage to the properties of the battery block. And if LEGO would
tell us that yes, you could connect DC as well, many of us could actually buy
something else form LEGO instead of the adapter, or just save a little bit of
natural resources for somebody else, if you like to put it that way...
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