For a headphone you do not even need the amp. The pcm5102a purple module can directly use headphones. Mine already has a 3.5 jack . It has been a life saver for devlopment at night.

I am planning to replace the amp with a Pam84xx and switch to a smaller/thinner speaker to save space. I may also add a nfc reader module to add nfc card music. Probably card will include a url to download music file.

Also my protoboard based solution is finicky. I starded building a pcb, however as this is my first pcb project I am taking it real slow.

Perhaps I can open a git repo to document share what I have.

I am open for suggestions for features.