Subject:
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Re: Power to RCX
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 12 Feb 2002 12:40:09 GMT
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Viewed:
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2932 times
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There is a difference between a voltage regulator (which limits the
maximum voltage applied to a circuit) and a rectifier (which turns AC
into pulsed DC - to be smothed out by a capacitor - it also ensures
that you can't connect a DC power source backwards).
The RCX's all have voltage regulators. That's why you can put in 9V
worth of batteries while the internals (except motor controllers) run
at only 5V. So, yes, you can hook up an adapter directly to the
battery terminals so long as it is:
a) a DC adapter - the lego trains use AC ones which can be
used on a 1.0 RCX (with external plug)
b) the adapter must have internal filtering (not just a
rectifier) since the capacitor in the later 1.0 and 2.0 RCX's isn't
nearly has high in value as the (I think) four that were used in the
early 1.0's. I'm not sure if the smaller capacitor will remove enough
DC ripple, particularly under load.
c) you must remember to hook the adapter up with the correct
polarity.
d) the adapter must not produce more than 12V. The motor
controllers aparently have a 12V maximum and I haven't found any
evidence of a regulator for them. I'd kill for an official schematic
of the RCX's.
Matthias Jetleb
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Message has 2 Replies:
 | | Re: Power to RCX
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| (...) Putting a regulator in front of the motor controllers would be utter nonsense IMHO. (...) Plus the data sheet of the motor controllers. Jürgen (23 years ago, 13-Feb-02, to lugnet.robotics.rcx)
| | | Re: Power to RCX
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| (...) Yeah!!! That's exactly what I wanted to know! (Aka "How to connect RCX for dummies" (that's what I am - electronics isn't hobby of mine) Thanks a lot! Have a nice day Rob (23 years ago, 13-Feb-02, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: Power to RCX
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| (...) Sorry, I am little confused. Does it mean that everything LEGO did was REMOVING DC adaptor hole to make difference between 1.0 and 1.5 version ? (talking about RCX hardware) and therefore i can connect my wall AC/DC adaptor directly to that (...) (23 years ago, 11-Feb-02, to lugnet.robotics.rcx)
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