Subject:
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Re: Is 18V correct?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 29 Jan 1997 12:15:25 GMT
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Original-From:
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Fred G. Martin <fredm@media.mit.edu*StopSpam*>
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Viewed:
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815 times
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this is correct. normal dc adapters are unregulated and there is a
reciprocal relation between voltage and current. when you just plug
it in and and measure voltage, current is 0 and hence voltage is higher
than the spec. if you draw the rated 500 mA of current you will see
the rated 12 volts. if you drew more than 500 mA (note, this would
stress the adapter and cause it to fail prematurely), there would be
fewer than 12 volts.
-fred
In your message you said:
> Oh, you hardware guys must really hate us software guys but...
>
> I just purchased a volt meter, I had used on in college a long time ago,
> so I placed the voltmeter across the AC adapter and it read 18.0, I'm
> guessing this is 18 volts, but I could be mistaken I had the Volt meter
> on 20V so I think it is correct but I would like some confermation on
> it.
>
> I bought the adapter from Gleason Research so I hope it should be
> correct.
>
> -Jim
>
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Message has 1 Reply:
 | | Re: Is 18V correct?
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| For the HB, when do you draw 500mA? When you put the interface on "Zap Charge", do you lower the voltage less that 12V? What about when you "trickle" it? Hihger that 12V? (...) (28 years ago, 29-Jan-97, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Is 18V correct?
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| Oh, you hardware guys must really hate us software guys but... I just purchased a volt meter, I had used on in college a long time ago, so I placed the voltmeter across the AC adapter and it read 18.0, I'm guessing this is 18 volts, but I could be (...) (28 years ago, 29-Jan-97, to lugnet.robotics.handyboard)
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