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not powering when plugged in to adapter

mp3 player was plugged to 9 volts but the rating of the mp3 plaayer was only 5 volts

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What is the brand and model or other identification of the device? Many devices have internal voltage regulators that can protect against over voltage.

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Its just a typical FM radio plus mp3 player.

I am just wondering what I should check, whether diodes or capacitors etc.

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