Simple MP3 player I made for my daughter.
MDF 10mm et 3mm, and less than 10€ of electronic components :)

1 on/off switch and 3 buttons :
_ play/pause
_ next/ vol+
_ previous/vol-

Parts list :

MP3 Player board :
https://www.aliexpress.com/item/TF-card-U-disk-MP3-Format-decoder-board-module-amplifier-decoding-audio-Player/32313174527.html

Speaker :
https://www.aliexpress.com/item/4-Ohm-5W-LCD-Panel-Speaker-Amplifier-audio-frequency-Output-1-Pair-with-4Pin-cable-Free/32820876781.html

Battery holder :
https://www.aliexpress.com/item/CES-Black-4-x-1-5V-AAA-Battery-Batteries-Holder-Case-w-Wire-Leads/32741974645.html

Micro push buttons :
https://www.aliexpress.com/item/50PCS-Lot-6X6X10-DIP-Tactile-Tact-Mini-Push-Button-Switch-Micro-Switch-Momentary-6-6-10/32703748092.html

Switch :
https://www.aliexpress.com/item/New-5Pcs-Lot-High-Quality-2-Pin-Snap-in-On-Off-Position-Snap-Boat-Button-Switch/32796200645.html


Music : Latche Swing