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    Circuit diagram
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    SD Card

    The SD card in the player must be formatted to FAT32. The player reads the tracks in the order they are written (not by the names), as an example track 53msg.mp3 is read by the dfplayer . Tracks files must be copied to the SD one track at a time and in the order they are in the computer folder. No other files or folders should be on the card. If you wish to change any of the tracks you need to reformate the SD first and then copy the new files.