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Reply to "Using an optocoupler to connect insulated rail to input pin of shift register"

gunrunnerjohn posted:

Take wire from DC ground, connect to outside rail common, job done.

Yes, it's just common with the AC ground from the transformer, no magic here.  You'll notice my previous diagram simply connected the common of the external supply to the outside rail.

I figured as much, but wanted to make sure. Does the ground from the DC supply need to be tied to AC ground for track power at the supplies themselves? 

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