Subject:
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Re: charger
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 10 May 1999 01:29:22 GMT
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Original-From:
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Eat Bugs! <jwp@awod.IHATESPAMcom>
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Viewed:
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635 times
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FRED MARTIN wrote:
>
> I have an old 'wall wart' lying around. It has a rating of (12 vdc 1 amp
> output).
> i was wondering if i can use it on the handy board. the specs i read about
> the handy board call for a 12v 500mAmp output. any response would be
> appreciated.
I'm relying on non-handyboard experience here, but I'm going to assume
that's too much. One amp is a heavy load, and although there's a 5v
regulator on the circuit, I'd guess that it's not rated for 1 amp (it
may just run hot) and might not be able to knock it down enough for the
logic circuits (mostly 50mAmp).
On the brighter side, it would probably be fairly simple to make a very
small circuit that could be taped to the transformer to knock down the
current. You could basically displace it as heat. Search some of the
larger circuit databases for a power supply circuit, or make it up from
the resistance law.
--
________________________________________
Jonathan Pennington
-Anthropologist/Geologist
-Linux User and Advocate
-Bug Eater on an '83 V45 Magna "Dark Side"
and a '71 Triumph Bonnie "Pieces"
Email at jwp(at)awod.com
"Where are we going?
And why are we in this handbasket?
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Message has 1 Reply:
 | | Re: charger
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| Hi all: The problem with using a wall wart that is NOT 12 V @ 500 mA is this: most wall warts are _not_ regulated, and they have a fairly high internal impedance. If there is no load on a "12 V" unit, the output voltage will likely be at least 18 V, (...) (25 years ago, 10-May-99, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | charger
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| I have an old 'wall wart' lying around. It has a rating of (12 vdc 1 amp output). i was wondering if i can use it on the handy board. the specs i read about the handy board call for a 12v 500mAmp output. any response would be appreciated. FRED (25 years ago, 9-May-99, to lugnet.robotics.handyboard)
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