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How do I know if my power supply is AC or DC?

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How do I know if my power supply is AC or DC?

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One way to determine if you have an AC-DC power supply or a DC-DC model is to look at the device itself. Often, the input and output information will appear somewhere on the surface. If the input is AC, you have an AC-DC power supply, and you have a DC-DC model if the input and output both are DC.

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