Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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Obviously, you have been looking at this more closely than I have.
The two diagrams could have been drawn similarly if the top and bottom diode circuits were swapped in either drawing. It makes no difference, chalk it up to artistic license. I am sure that you realize that the diodes on the right are Light Emitting, while the diodes on the left are just diodes.