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Author Topic: Question about DC adapters  (Read 1756 times)

Aglar

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Question about DC adapters
« on: September 30, 2005, 05:21:04 PM »

I recently acquired a 10/100 5 port StarTech switch for free because it was missing the adapter. I found an identical switch and looked at the adapter, it says 12v and 500 ma. I found an adapter lying around that is 12v and 1000 ma. Now, my knowledge of electronics is fuzzy as best. If I use the 1000 ma adapter will the switch just draw as much current as it needs and that's all there is too it, or will using a 1000 ma adapter for a 500 ma device fry something?
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I LOVE ED

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Re: Question about DC adapters
« Reply #1 on: September 30, 2005, 05:37:10 PM »

i believe you can go over, not under the device's ratings.
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Firespark

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Re: Question about DC adapters
« Reply #2 on: September 30, 2005, 06:04:42 PM »

so far as i know it will work fine.
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BalefireX

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Re: Question about DC adapters
« Reply #3 on: September 30, 2005, 06:06:02 PM »

i believe you can go over, not under the device's ratings.

By device he means (at least, I hope he means) the switch in this case, and not the adapter.
In short, you should be OK.
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AlienBlood

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Re: Question about DC adapters
« Reply #4 on: September 30, 2005, 06:23:09 PM »

as long as the output voltage is the same, you can use a supply that's rated at more amps than what the device requires.  Kinda like putting a 1000W PSU in your PC, where all the voltage rails are the same (12V, 5V, 3.3V, etc.) but the maximum amperage is higher than, say, a 300W PSU.

The only thing you need to be careful of is the POLARITY of the tip.  It should be labeled on both the device and the power supply....just make sure they match, or you WILL fry something.
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viridius

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Re: Question about DC adapters
« Reply #5 on: October 01, 2005, 02:17:29 PM »

Also, make sure that the output is DC, not AC.  Some adaptors for devices that don't care what the polarity is (like halogen lamps) forgo the rectification and output filtering circuit.
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Aglar

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Re: Question about DC adapters
« Reply #6 on: October 01, 2005, 03:23:41 PM »

Thanks guys, I had a feeling it would be like the situation with PSUs, but wanted to be sure.

As far as polarity is concerned, if I plug it in and it works, I assume that means it's fine, right?
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pinkpanther

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Re: Question about DC adapters
« Reply #7 on: October 01, 2005, 03:38:49 PM »

Well provided you didn't smell anything burning and the switch didn't stop working about five seconds later, I'd say you're in the clear. 
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Aglar

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Re: Question about DC adapters
« Reply #8 on: October 01, 2005, 04:00:24 PM »

Righto, I figured I would know quickly if it was a problem.

Thanks for the help all. Free hardware rocks ;)
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