Subject:
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Re: RCX 2.0 Power Supply
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Newsgroups:
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lugnet.robotics, lugnet.trains
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Date:
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Wed, 15 Sep 2004 17:20:18 GMT
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Reply-To:
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robots@%IHateSpam%deeletef3p.com
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Viewed:
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1697 times
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"Mark Riley" <markril@hotmail.com> wrote:
> Hi All,
>
> I've posted some photos on Brickshelf of an external power supply for the RCX 2.
On a marginally related note, does someone out there have the
equipment to accurately test the output voltage of some typical dc
power supplies like the one used for this external ps? I tested every
ps I could find in my house (probably 20 or more) and *none* of them
put out the stated voltage. A typical 9v was putting out somewhere
between 12 and 15. This seemed to be a typical overvoltage percentage
(~50%). If someone else could check a few, it might provide some
useful information (I may not have a clue when testing).
If someone could test a genuine LEGO PS, that would be *really*
useful.
Thanks.
-Jon Gilchrist
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Message has 2 Replies:
 | | Re: RCX 2.0 Power Supply
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| (...) You need to check the voltage while the PS is under load. Pretty much every power supply puts out more when the load is low or nothing. Has to do with loads of factors, but mostly quality of the PS (and (thus) internal resistance of the PS) (...) (20 years ago, 15-Sep-04, to lugnet.robotics, lugnet.trains)
| | | Re: RCX 2.0 Power Supply
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| (...) It is nearly impossible to build a power supply that puts out the rated voltage when there is no load. Most will put out too high a voltage (like you have seen), some just shut down. To meassure the voltage of a PS, shorten it with a 1000 Ohm (...) (20 years ago, 15-Sep-04, to lugnet.robotics, lugnet.trains)
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Message is in Reply To:
| | RCX 2.0 Power Supply
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| I've crossposted to .trains because this will be useful for those wanting to run LDCC with an RCX 2. Hi All, I've posted some photos on Brickshelf of an external power supply for the RCX 2. The nice part about the design is that program memory is (...) (20 years ago, 15-Sep-04, to lugnet.robotics, lugnet.trains, FTX)
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