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
Make Your Own Cheap Portable MP3 Player (Bluetooth, USB, AUX, SD Card, FM) : 4 Steps (with Pictures) - Instructables
Make Your Own Cheap Portable MP3 Player (Bluetooth, USB, AUX, SD Card, FM) : 4 Steps (with Pictures) - Instructables
How to make USB, FM, SD Card Mp3 Player at home | Assemble SD Card Music Player - YouTube
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
MP3 Player with SD Memory Card
DIY Pocket MP3 Player | Hackaday
How to Make a Simple MP3 Player | Arduino | Maker Pro
How to Make a SD card Mp3 Player_ very easy. - YouTube