Thank you for teaching me so much.
I am thinking of laying the whole bottom layer as the GND plane.
As for the AC-DC power supply i m using, it is an open-frame module which its Earth connection is connected to its metal frame. Its COMMON (GND) is not tied to its Earth. So r u suggesting me to tie them up together for safety reason? Meaning that PCB GND that is connected to the COMMON (GND) of the AC-DC will eventually be connected to the Earth at some points?
i believe ur pcb gnd is common to acdc gnd..so do not tie earth
I dont have any guard rings on my design. Is it necessary? If it is, may I know how should i lay it?
guard ring has many functions, but in ur case..i think it's not that critical..check out:
**broken link removed**
Thanks.
Sincerely,
Eric