Subject:
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Re: What AC adapter to use for RIS 1.0?
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 11 Mar 2001 10:10:55 GMT
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Original-From:
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Michel Gallant <MGALLANT@GRASSROOTS.NSspamcake.CA>
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Viewed:
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806 times
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Hello everyone, I've just signed up to this mailing list and it looks like
there's a lot of cool information being passed around here. Anyway, I
have an RCX 1.0 with the power jack. Some time ago, I noticed the
markings in the plastic above the jack. Since I know something about how
such power supply circuits work, I figured that there would be a bridge
rectifier, some smoothing capacitors and a voltage regulator providing
power when using the AC adaptor. This type of circuit will happily run
off DC input as well as AC. So, I took an old multi-adapter, set it on
12V, and plugged it in. Everything worked fine! I flipped the polarity
switch on the adapter back and forth a few times, and the RCX didn't
care. So, any old DC adapter in the 12V range should do fine. The only
thing to watch out for is the current capacity of the adaptor. Whoever
said 7A was probably misquoting or given a misquote. That would be one
heckuva big brick. IIRC the Lego motors will draw less than 200 mA when
stalled, so for a project with 3 motors, a 700 mA brick would be fine. If
anyone wants me to post more accurate measurements, just let me know and
I'll test some motors, lights, the RCX, etc.
mgallant
On Sun, 11 Mar 2001, Matthias Jetleb wrote:
> On Thu, 22 Feb 2001 05:51:10 GMT, "Cyborg" <cyborg@euroseek.com>
> wrote:
>
> > I just got a second RIS, this one is the RIS 1.0 with the power adapter
> > input. I tried to find that AC adapter on S@H , but couldn't find it.
> > There is not even any info about it in the RIS 1.0 itself.
> > All the info I found was, that I need a 10V 7VA adapter for it.
> > Where can I find such an adapter?
>
> A final word on this subject. I've posted two replies already but have
> missed the obvious until today.
>
> Unfortunately, it's so obvious that it's embarrassing.
>
> I made a comment that I was surprised that there were no instructions
> in the manual as to what adapter to use, and that there were no
> markings on the RCX either. I was under the impression that this was a
> legal requirement. I still don't know for sure if it is a requirement
> or not, but I now know for sure that it is molded right into the
> plastic directly above the input jack.
>
> In beautiful Lego yellow on a Lego Yellow background (nice color
> scheme - it's no wonder no one can find it) it reads: "9 - 12V ~"
>
> The " ~ " indicates AC, hence polarity is irrelevant.
>
> Matthias Jetleb
> VA3-MWJ
>
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Message is in Reply To:
 | | Re: What AC adapter to use for RIS 1.0?
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| (...) A final word on this subject. I've posted two replies already but have missed the obvious until today. Unfortunately, it's so obvious that it's embarrassing. I made a comment that I was surprised that there were no instructions in the manual (...) (24 years ago, 11-Mar-01, to lugnet.robotics)
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