Connect an MP3 Player to a Tape Player : 6 Steps (with Pictures) - Instructables
khubik в Twitter: "Hint: if you connect the charger, you can remove the battery emulator after you pass the auth :) I guess you can go even with just three Dupont wires
Best MP3 players in 2022: the top portable music players | TechRadar
chriga's blog: Audino - Arduino MP3-Player
How to Use an MP3 Player in Your Car
Make Your Own Cheap Portable MP3 Player (Bluetooth, USB, AUX, SD Card, FM) : 4 Steps (with Pictures) - Instructables