ProtoDAC TDA1387 X8 project

[kookedtweeter]

The "ProtoDAC TDA1387 X8" PCB has a ground plane. I would try powering ProtoDAC from a separate source. Use a stacking header with GPIO pins 2 and 4 removed, so ProtoDAC doesn't get power from the GPIO. Then use another 5V supply and apply power to the pads between the RCA jacks. You can also use DuPont jumpers instead of the stacking header from the RPi GPIO connecting 6, 12, 35 and 40. Keep the length of the jumpers 10cm or less.

If the noise is still there, the final possibility could be that it is coming from the TDA1387 module. It might have a single defective chip, bad solder joint, etc.

Ok, so i painstakingly desoldered the entire header...why did i solder ever pin lol.
Powered the dac externally and its quiet.
The noise is comming from the PI itself. When i scope the 5v on the gpio header i see the same noise as before. So the pi is givng me a bad 5v out.
Well good to know its not the dac.