Subject:
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Re: External power supply ?
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 12 Jan 2004 14:37:56 GMT
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Viewed:
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1639 times
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Hi Ken,
>
> - Your regulated power supply was able to put out 9v.. at what m/A is
> recommended for the RCX 2.0?
Maximum RCX power consumption is 1500 mA (there is a fuse inside rated 1.5A).
Anything rated at least 1A should be OK.
>
> - I see "regulated" wall-warts listed at radio shack. Would one of these
> suffice?
They should, if they are really regulated (some cheap warts advertised as
regulated are not so good...). A LEGO 9V train adaptor could be used too.
>
> - In another lugnet posting on this topic, a fellow used a voltage regulator
> 7809 or 7805. Is this necessary only if using an unregulated dc supply?
If your wart has good regulation, they are not needed.
CAUTION - Don't forget to take care of polarity too !!!
>
> - I would still have the issue of having to program once powered by the adapter.
> Is there some way to have batteries in it and have it switch. I want to run
> some atuomation at a train show and don' have a working laptop.
That's the problem - automatic switching is not so easy to do if you don't want
to do some electronics. Perhaps the simplest solution would be to use a RCX
first version with power input :-/
Cheers,
Philo
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Message has 2 Replies:
 | | Re: External power supply ?
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| (...) CAUTION!!! The wall-wart that comes with the train adaptor puts out an AC voltage that will likely damage your RCX if used this way!!! I have read reports of people burning out their RCXes by connecting the wall-wart to the battery contacts (...) (20 years ago, 12-Jan-04, to lugnet.robotics)
| | | Re: External power supply ?
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| (...) I ran by Radio Shak today and they had one 3-12v rated at 1A I think. It was $37! (...) I have considered that too. But uncovered another potential complication. In researching around somewhere... I think at lego.com actually it said that RCX (...) (20 years ago, 13-Jan-04, to lugnet.robotics)
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Message is in Reply To:
| | Re: External power supply ?
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| (...) Philo, I want to attempt the conversion to an external power source. I have looked at your page but I have a few questions. Please forgive me that I know next to nothing about electric power and electronics -- or so it seems. - Your regulated (...) (20 years ago, 12-Jan-04, to lugnet.robotics)
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