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I would not say you need an especially robust one. They come in different sizes based on the amount of voltage they output and the potential current they can supply.

They're also typically really cheap, which can be an advantage if you fry one. Or two. Or ten. Not that I'm speaking from experience or anything. :-)

Seriously though, if you have any kind of thrift store, surplus store, or something of that nature near you, you can often pick up random wall warts for next to nothing.




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