I'm planning to build a Digital Audio Converter as a hobby device and I had some questions regarding safely grounding the chassis.
I want to purchase a power supply like this one:
MicroMall(TM) NEW Universal Regulated Switching Power Supply DC 5V 3A 15W
and place it inside a metal chassis. I'm going to ground the power supply to the earth ground. I want to minimize any interference with the audio output (RCA jacks in the case).
I have a couple questions:
1) should the V- of the DC circuit be connected to the earth ground?
2) How can I ground the external chassis?