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Too many amps?

D

David Wright

Jan 1, 1970
0
I am a total electronics novice so hopefully someone can help -

My Network router failed, and it turned out to be a burnt out power
transformer. The transformer in question was 12v 1.25a - I have been given a
replacement that is 12v 1.5a and it seems to work (I am using it right now
to post this question) but the Router clearly says "1.25a max" on the back.

Am I likely to be doing it any damage? Should I stop using it and look for a
lower rated one?

Thanks,
D.
 
C

CWatters

Jan 1, 1970
0
David Wright said:
I am a total electronics novice so hopefully someone can help -

My Network router failed, and it turned out to be a burnt out power
transformer. The transformer in question was 12v 1.25a - I have been given a
replacement that is 12v 1.5a and it seems to work (I am using it right now
to post this question) but the Router clearly says "1.25a max" on the back.

Am I likely to be doing it any damage? Should I stop using it and look for a
lower rated one?

No. What you have is fine.

The spec on the transformer (1.5A) is the maximium that it can deliver.

The spec on the router (1.25A) is the maximium that it will draw from it's
power supply.

The router needs 1.25A max. The power supply can deliver 1.5A so all is OK

Colin

PS It's not the same with Volts!
 
M

Mike Berger

Jan 1, 1970
0
I would add this caveat:

The wall-wart linear style power adapters have very poor regulation
and usually deliver the rated voltage when you're drawing sufficient
current. So using a well-regulated power supply that delivers the
correct voltage, but can deliver more current, is just fine. But
using a poorly regulated one that is too big might deliver more
voltage than you'd expect.
 
C

CWatters

Jan 1, 1970
0
Mike Berger said:
I would add this caveat:

The wall-wart linear style power adapters have very poor regulation
and usually deliver the rated voltage when you're drawing sufficient
current. So using a well-regulated power supply that delivers the
correct voltage, but can deliver more current, is just fine. But
using a poorly regulated one that is too big might deliver more
voltage than you'd expect.

Yes I'd agree with that. It depends a lot on the quality of the wall wart.
Some have much better regulation than others.
 
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