TABLE OF CONTENTS Developing artwork for the board design was briefly introduced in Chapter 2. Here we look at this step in greater detail.
As with the previous examples, we use a simple circuit to minimize those details and allow us to focus on the board layout and manufacturing steps. The circuit (shown in Figure 10-1) consists of a 10-pin PCB connector (J1), a bypass capacitor (C1), a logic IC (U1), load resistors (R1 and R2), and two plated mounting holes that electrically connect the Ground plane to the PCB's mounting bracket. Once we move the design to PCB Editor, two more mounting holes will be added that are nonplated and electrically isolated from the board. The two types are used so that, when we generate the drill files, you will be able to see the differences between the two types of drill holes.
Table 10-1 shows the bill of materials for this design. Only the footprint symbol for U1 (soic14) is from the native PCB Editor symbols library. The footprint for C1 was made in the footprint design example from Chapter 8; the electrically connected mounting hole, mtg130p, is a custom symbol; and the remaining symbols are modifications of existing footprints. The footprint symbols are on the Web site for this book, and you need to copy them (and the associated padstacks and flash symbols) into PCB Editor's symbols folder. You also need the mtg130np mechanical symbol, which is...
