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I have this d-link router, it's original power supply was 5V and 1.2A, but I found a 5V 1A supply.

It is working, but does it represent a risk to use it? What could happen?

rafael.js
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    The router might shut off without warning, or it might work fine. – Hearth May 13 '18 at 00:08
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    The power supply voltage may drop below 5 V. It may run hot. – Transistor May 13 '18 at 00:18
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    Back in the day, it would have been the efficient reuse of otherwise wasted equipment laying around. Everything was overbuilt as a matter of course. Today? No. Transformers are poorly wound with 30-40% regulation or worse and every penny is accounted for. It's much more risky than once. Check the temperature. If it feels like you can easily hold it after some use, that's a data point in its favor. Though it is no assurance of anything. – jonk May 13 '18 at 00:40
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    More chance of noise and unexpected behaviour – Tony Stewart EE75 May 13 '18 at 02:19
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    It will reboot during heavy traffic. – Passerby May 13 '18 at 04:50
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    If the components aren't specified to be interoperable (and the twenty-percent power discrepancy is a mismatch) you might get unspecified behaviors. Or not. It's like the sell-by date on a chocolate bar; it's probably fine a week after, or a year... unless it isn't. – Whit3rd May 13 '18 at 06:31

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