Re: Watch out for the polarity markings!
I put one of these in a box and use it for playing mp3 files through the hifi system. I don't remember if the power leads were coded correctly, as mine came with no documentation whatsoever and I had to decode all the connections from the PCB.
Although I don't use it, the FM radio works surprisingly well for such a cheapie once you've worked out where the aerial connection is on the PCB.
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