Subject:
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Re: power source
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 17 Feb 2002 10:48:32 GMT
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Original-From:
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Mathias Uhr <uhr@mathias.+nomorespam+net>
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Reply-To:
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uhr@{spamless}mathias.net
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Viewed:
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626 times
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hi matthias with two "t"s, hi list!
> > please note that power from the batteries is not regulated inside the
> > rcx! (on the contrary to the power plug of rcx 1.0) if you connect a
> Actually, it is regulated (speaking as one who has had to replace the
> fuse that comes before the regulator). Think about it. It has to be.
> The batteries provide 9V, the MCU requires 5V.
i didn't mean the mcu - it's obvious that the "digital part" (as i called it)
has to be regulated to 5v. i meant before that: motor controllers,
probably active sensors and the like.
the point is this:
the rcx 1.0 has a rectifier, big capacitator and regulator ic behind
the external power plug (whereas the input from the batteries does
not go through this part of the circuit). you could even plug in an
ac source of 12v and it gets transformed to - as i suppose - 9v dc!
(for the whole circuit, then again to 5v for the mcu)
he later hardware versions of the rcx do not have this feature - it
was removed together with the power plug.
basically, i just wanted to say that we must be more careful when
connecting external power sources to the battery contacts of a rcx
1.5 or 2.0 than over the external power plug of the 1.0 version!
greetings
mat
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