Subject:
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Re: RCX Blowed up?
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 31 Oct 2000 22:49:29 GMT
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Viewed:
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1730 times
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"Dean Husby" <wrote :
> Rik Bos wrote:
> etc.
> > Al rihgt ,
> > something about powersupply's,
> > The vallue written on a AC (alternating current)powersupply is the
> > effective-value (that means its the amount of energy of it) .
> > When AC is rectified and become DC after the rectifierbridge ther is a
> > condensator (elco) for filtering out the ripple (120Hz or 100Hz in • Europe)
> > the it's truely DC and the we are talking about the top-value • (amplitude) of
> > the AC-voltage.
> > Are you following me ?
> > This means that the DC-voltage is 1.41 (square root(2)) higher than the
> > effective-value.
> > Sample 12V AC becomes 12 * 1.41 = 16.9V DC minus the voltagelost over • the
> > rectifiers (diode's) 2 * 0.7V = 15.5V.
> > The core of the RCX is working on 5V that means that the power regulator
> > must "eat " 10.5V !!
> > If you chose a AC-powersupply the take one with a outputvoltage from 8 • to 9V
> > AC (8V is better you have then about 9.8V DC)
> >
> > Regards
> > and hoped to cleer out somethings about this.
> >
> > Rik Bos
>
> Doesn't Lego Sell the same power adapter for RCX as they do for Trains?
>
> I've been using that one with no problems so far...
>
> Dean
> --
I don't know the specs of the Lego-adapter but I suppose that the
continantal(Europe) adapter difference from the american one's
because they(Eur.) work with a main-voltage of 230V the elder one's with
220V !! and a frequentie of 50Hz.
On the other side of the big water you work with 110V main-voltage and 60Hz
so the must used have differernt transformers.
Not only the drop-voltage in the regulator but also the current is of
importance if you three heavy loaded motors connected to the RCX there runs
a current of about 200 to 300mA the the power absorbed by the RCX will by
about 2.1W to 3.15Watts and that's a lot of heat in the case.
The electronics will heat up if there's not enough cooling, the ambient
temperature will be a factor to....
Rik
rikbos@xs4all.nl
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Message is in Reply To:
 | | Re: RCX Blowed up?
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| (...) Doesn't Lego Sell the same power adapter for RCX as they do for Trains? I've been using that one with no problems so far... Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (URL) (26 years ago, 31-Oct-00, to lugnet.robotics)
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