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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Thu, 15 Jan 2004 01:03:15 GMT
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Viewed:
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1482 times
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"ken koleda" <kkoleda@co.wayne.mi.us> wrote in message
news:HrD4zL.1sEF@lugnet.com...
<<snip>>
> 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 power supply was able to put out 9v.. at what m/A is
> recommended for the RCX 2.0?
>
> - I see "regulated" wall-warts listed at radio shack. Would one of these
> suffice?
>
> - 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?
>
> - 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.
>
> Thanks
>
> ken
Hi Ken,
I have been using a Radio Shack Cat #273-1772 with good results. It is a
regulated supply that is rated for 9 VDC 1300 mA. When I read the no-load
output with my DVM it shows 9.4 volts -- close enough for me. I suppose you
could smoke a motor using it if you really loaded the motor up, but I
haven't had any problems. The only issue is that you lose the programming
when you unplug it (though I never considered the earlier reply from Philo
about a capacitor. I will have to see if I can get it unplugged and put
batteries in without losing the programs).
I made dummy batteries as Philo suggested on his website (though mine are
square). I bought a size H female connector also at Radio Shack, which I
epoxied into a hole I drilled intothe side of the rear 'battery'. This
lines up with the notch in the battery case of the RCX. I then cut a
matching notch in the battery cover so I can have the cover on and still
plug in the power supply.
Jim
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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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