I am trying to use the circuit shown below in the picture.
In the circuit, from the AC supply, the PE is connected with the ground symbol. I assumed I need to connect PE (protective earth) with the DC Gnd (-ve terminal).
Is that correct?
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The purpose of linking a DC device to an earth is often to leak static electricity away from the device. This could be generated by a rotating part, like a fan or a harddisk for example, or a lot of other causes, see wikipedia