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.
replyI 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.
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?
replyI only checked it with a mdr-zx770bn. And it was OK. But as I did check that with a breadboard, any noise could be attributed to bad connections/emi.
replyNow I'll check it when I work on this next time. Probably in the upcoming days. ( Still my current protoboard would be only a tad bit better )
I rechecked it. There is no noise or distortion. In fact volume levels are pretty good. I am using some digital volume control and can't go too high.
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