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Originally posted by BrianW
More questions:
Mains AC yields three wires: Power, neutral and earth. Is this right?
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Yes.
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The schematic shows two wires going into the transformer. One is labeled L (load? is this power?), and N (Neutral?), with a fuse between mains, and transformer on the N wire. Since I assume earth is unused, should I connect earth to the metal project case, that the transformer wil be in?
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Yes, you've got it right. Ground can go to the case. L for the power or hot side. N for the neutral, neutral is also where the fuse will go.