So, I didn't use my adafruit mono amp since I use the USB Audio Card. Is there a still a need for the audio amp? I used the DAC. Just curious if anyone has a wiring up of all this using the original headphone jack? I tried to follow Wormy layout but the DAC has stereo so I made use of that.

Hello, I checked continuity between the said ground that Helder mentioned and I have continuity. I have a updated board (Blue) with Helders included screen. All lines check continuity no problem with a meter. I power everything up, and I have 3.3v at VCC and ground checks fine. I am not getting any ...