OK I bought a USB speaker I think I identified as this one
https://i-item.jd.com/10041072500661.htmlas it has sort of the same model number as the PCB (see photo)
Image did not attach properly - I dont know how to do this
https://ibb.co/HrrnT0YThe problem is, when driving it with a Raspberry Pi sometimes the sound is very distorted, slow and a bit quiet.
I think the problem is with USB DAC/CODEC.
I want to track the problem down but first I would like to identify the ICs but the numbers have been erased.
Given the pinout of the 8 pin amplifier it looks to be an 8002 or similar (pins 5 and 8 connected to the speaker).
The USB DAC is much harder to identify. It looks like pins 13 and 14 are wired to the amp via R/C.
Yet I cannot find a chip that meets these specs.
Probably some cheap Chinese knockoff.
This board might have the same IC but again no visible identifcation.
https://www.aliexpress.com/item/32680489310.htmlAny ideas?