I have a magnifying glass LED lamp that I lost the power adapter to. There are no power requirement markings anywhere on the device, nor do I have the box/manual.
Short of trying to find the device's specs online (easily doable), I'm wondering if it's possible to determine what power rating of an adapter it would use based off the type and number of batteries it takes? The battery compartment takes 3x AA batteries.
Would that simply mean I need an adapter of 4.5 volts? Or is the rating between the two power supplies not as simple of a correlation as that?
I understand that amperage is "pulled", but would I also just add the amperage ratings of AA's together?
And finally, what about polarity? Is it possible to determine what adapter would have the correct polarity (short of looking it up)?