Once all the components have been placed, named intuitively, and wired together, the user experience must be considered. What is obvious to the author is often subtler to a brand-new user; therefore, labeling and isolating portions of the project allows direction for a new user.

In the example, the only variables that need to be changed by the user are located inside the box on the left of Figure 4-18. The schematic connections on the right interact with the user-dependent variables (parameters) but have less chance of being overwritten in the actual schematic.

The last user interaction to the circuit is op amp placement in the middle of the schematic of Figure 4-18. A part can be placed from the PSpice® Part search (similar to a parameter), by navigating through the Texas Instruments > Amplifiers > Operational amplifiers (op amps) or through the search (located next to the All Categories drop-down menu with the magnifying glass). A wildcard can be used in the search as an asterisk (*). Double-click to place.

Over 90% of the TI's op amp portfolio place with the same pin-orientation seen in Figure 4-19, non-inverting input (IN+) and positive power supply (V+) oriented at the top. The schematic was drawn in a way that allows the user to simply drop-in,as seen in Figure 4-20, without having to rotate or mirror.