I used this little board to upgrade a 20 year old boombox that still works great and give it some modern features. I ripped out the radio block and installed it in place. I've used it to play MP3 files on a USB stick and audio on my phone via Bluetooth. Both worked great and reliably. The only thing that would make it even better for projects like mine would be if it had a solder pad or connector that provides all the power, audio, USB, and button connections. I soldered wires to it (dead bug style) and it worked fine. But it can be a little tricky if you are not used to working with PCBs with SMT components. A really cheap USB power adapter I tried with it caused a weird buzzing in the audio. So if you don't get clean sound, try a different power supply. The only downside for me would be that there is no option to mix audio from USB.
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