Subject:
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Re: External Power Port Problem..?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 9 Dec 1999 21:53:31 GMT
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Viewed:
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445 times
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In lugnet.robotics, Nick Taylor writes:
> Jonathan Perret wrote:
> [snip]
> > Did the 1.0 RCX really take AC input, btw ??? I've never seen
> > anything but DC being supplied through plugs like that...
> >
> > Cheers,
> > --Jonathan
>
> Hi Jonathan ... yep, the 1.0 RCX can take AC or either polarity
> DC. The LEGO wall wart supplied with their train delivers 10 or
> 11 volts AC ... and works fine on the RCX.
Yes, but this may be the very reason it has been dropped. A lot of people have
connected DC supplies capable of delivering far more current than the correct
transformer. The problems are that when using a DC supply, only two of the
diodes in the rectification bridge are in use, and will fail at a lower
current than when fed with AC, and with the higher current available from some
supplies, there have been failures...
The best way to go with the 'rear supply', would be to rectify yourself if
required, and have a fuse to provide protection against a short - look at a
fast blow 3A design.
Best Wishes
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Message has 2 Replies:
 | | Re: External Power Port Problem..?
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| (...) This is my take on the problem: Many (most?) DC wall warts supply a voltage as much as 200% of the rated output when lightly loaded ... so a really big 12VDC wall wart may supply as much as 20+ volts to the RCX. As careful as TLG is in (...) (25 years ago, 9-Dec-99, to lugnet.robotics)
| | | Re: External Power Port Problem..?
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| (...) This is my take on the problem: Many (most?) DC wall warts supply a voltage as much as 200% of the rated output when lightly loaded ... so a really big 12VDC wall wart may supply as much as 20+ volts to the RCX. As careful as TLG is in (...) (25 years ago, 9-Dec-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: External Power Port Problem..?
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| Jonathan Perret wrote: [snip] (...) Hi Jonathan ... yep, the 1.0 RCX can take AC or either polarity DC. The LEGO wall wart supplied with their train delivers 10 or 11 volts AC ... and works fine on the RCX. Have fun, - Nick - (25 years ago, 9-Dec-99, to lugnet.robotics)
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