OK, will try this new forum setup.
Hooked an mp3 qwiic trigger to an sta540 kit. It produces a nice whine while not playing a track. when playing a track, the whine does not seem to be there. The qwiic is running fine from an UNO and does its tricks ok, like pause, stop, etc. (BTW, there should be a note on the instructions to use the I2C instructions by removing the _ and capitalizing the second parameter, and don’t forget the parens if no argument).
If I use a separate external amp for playing from the mp3 player, works fine, so some kind of power problem?
I tried a bench power supply, and switching supply, identical whine. I also isolated the amp power with l-c filters on plus and on minus and both, identical whine.
Has anyone else tried using the wm3/sta540 pair? any suggestions? It could be a powerful pair with an uno!
Looking at the forums and seeing a lot of no answers, so hoping folding tech help into the forums might be a good idea.