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<p>If the external power supply to a device fails, and I can't get the
exact model, what do I need to specify to get the right replacement?  I
can re-use the old supply's connector, but what about the voltage and
current ratings?  How close do they need to be to what it says on the
device?

<p>What if the device isn't marked and I don't know its specs, but the old
supply is marked with its ratings?

<p>Is it OK to go lower voltage, or should it always be higher?  What
about current?  I don't want a 10 A supply to damage my 1 A device.