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No knowledge of circuits or basic electonics - MP3 player, how to make direct connection without charging the battery, what voltage adapter does it require to run : r/PCB
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How to Make Smallest SD card Mp3 Player | DIY Mp3 Player | Sd Card Player | Mini Mp3 Player - YouTube
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Make Your Own Cheap Portable MP3 Player (Bluetooth, USB, AUX, SD Card, FM) : 4 Steps (with Pictures) - Instructables
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SparkFun MP3 Player Shield- MP3 decoder- Turn Any Compatible with Arduino Board into a Fully Functional MP3 Player- 3.5mm Audio Out Jack- 0.1" Spaced Header for Speaker Out- microSD Card Slot: Amazon.com:
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Aibecy Mini Portable USB MP3 Player Mini Clip MP3 Waterproof Sport Compact Metal Mp3 Music Player with TF Card Slot - Walmart.com
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