This is for posting final maxed out designs.
The rule is that at least one input or output belt/pipe must utilize a full (40 item per second) express belt or a full (60 items per second) pipe. Any expansion, would require a duplicate instance of the setup.
As an example, here is a maxed out basic circuit production schematic (note the maxed out 40 iron plate in and 40 circuits out), picture and blueprint screen:
SCHEMATIC IN-GAME