Some devices (such as guitar equipment, for example) use the "reverse" polarity of the power connector: the barrel is positive polarity, and the pin is negative.
Whereas power supplies usually use the "standard" polarity: the barrel is negative polarity, and the pin is positive. And if there is no polarity switch, they cannot be used directly.
There are reverse polarity converter cables so that you don't have to do any extra work.
In this case for 5.5 x 2.1mm.
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