I see this question on EE but reading those I am not sure they answer what I am asking here.
This is the problem. I am designing an audio device that is powered by an external 15VDC adapter. This external adapter wall plug have two pins. No ground connection to the AC outlet. The output of this adapter has two wires, positive and negative.
Internally, my device is receiving this 15VDC and creating a virtual ground, that is 7.5V, 0V and -7.5V.
This is an audio device and it has an amplifier, so I will have shield cables all over the place, from the volume potentiometer to the PCB, from the input/output connections to the PCB and so one.
Like I said, this device has no ground wire connected to the AC power outlet but I need the metal case to act as a RF shield, to prevent hum.
How should I proceed in terms of wiring? I mean, I have all these cable shields. Should I connect all the cable shields to the metal case? Should the metal case be connected to the internal 0V?