Cool. I'd like to try something similar. Does that amplifier module drive headphones as well? What future replacement do you have in mind? Is it all low power enough to use a battery?
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.
Oh interesting. The datasheet for the PCM5102A says it supports line-level output with a minimum load of 1kΩ [1]. I think most headphones typically have an impedance of less than 100Ω. I'd guess the excess current results in some distortion or low volumes? It works fine in practice though?
