Ok, I am again desperately trying to solve my sound-output challenge. :wall:
Summary for the new members: When playing sounds with the GHI Music module, you are perfectly fine with a headset, but as soon as you connect an external amp, there is a lot of noise and the output is DC-offset. After a long discussion, I proposed to follow the VLSI guideline (http://www.adafruit.com/datasheets/vs10XXan_output.pdf) for connecting LINE-OUT in the right way - here is my plan of attack https://www.ghielectronics.com/community/forum/topic?id=13497&page=5#msg144218
No-one was really able to confirm that the route was right, and those involved took other paths in trying to figure out what to do.
I still have a marginal hope, that a few electrolytic capacitors placed in the right locations might solve the problem. But I am software guy…
Looking at the Adafruit MP3 board, they have placed some specific power supply decoupling, and they seem to have followed the guidance.
Any ideas on the next step here?