Produce Your Own PCB Board Jack Ou Engineering Science Sonoma State University

1. Produce Your Own PCB BoardJack OuEngineering ScienceSonoma State University

2. Four-Bit Adder-Subtractor (4 bit ripple adder)

3. A Four-Bit Adder/Subtractor on Breadboard Problem: too many wires!

4. Add Components

8. AND

9. Schematic

10. Tips • Double click to terminate a wire

11. Add Junction to the Schematic Add junction to the schematic.

12. Add Power and Gnd of Each IC Chip to the schematic 1. Right click on a part (74LS08N in this example) 2. Click on Invoke

13. Invoke a Part Select PWRN, Press OK.

14. Power and Ground Added

15. Move • Use the Move button to alter any component’s location Click on + to move a part

16. Delete

17. Display Net Name 1. Enter a net name 2. Display the netname

18. ERC error Use ERC to check connectivity of the wire.

19. Rewire to Clear ERC Error

20. To Start a New Board File

21. Board Editor If you keep both windows open, changes made on the schematic window will be reflected in the layout window.

22. Turn on the Grid

23. Rearrange the Comopnents (Right-Click to rotate a component) (The smaller the board, the more economical)

24. Click on Route to Start Wiring Up the Circuit (Left click to select air wire to route) Double click To remove wire

25. Routing Menu Add angel to the wiring (Width of a wire) (Two Metal Layers) You should select the width of the wire to be 0.04 inches (40 mils) or greater.

26. Reduce the Active Area Hieight is 2.5 inches

29. Load the Design Rules

30. Minimum Width of 40 miles

31. Change Clearance Distance

32. Outer Via Dimensions

33. Alternative: Load the default autorouter file

34. Auto Router Click this option to start autoroute

35. Result of Auto Route 2 metal layers used Not area efficient

36. Use only the top metal layer for layout

37. Header Termination Terminate the traces going to the header at the bottom metal layer Reason: this is where the IC will be soldered. Header terminates at the top metal layer—not a good practice

38. How to Change Metal Layer Step 1: Click on ripup, double click a wire to delete.

39. How to Change Metal Layer Step 2: Move the wires to create sapce

40. How to Change Metal Layer Step 3: Route wire. Start routing at the top metal level. Step 4: Click once to place the wire in an empty area. Step 5: Switch to the bottom layer Step 6: Make contact with the pad at the bottom layer

41. Change the Shape of Via to Round

42. Round Via

43. Magnified View

44. A Sample Eagle Layout Clean up the metal layer

45. Jumpers • You will need to use physical wires as jumpers in places where you can’t route across existing copper trace.

46. Add Vias • Add Vias • Drill 0.03149 (Assumptions: 1. drill bit is approximately 31 mils in diameter 2. wire size is 29 mils) • Diameter 0.056 (56 mils)

47. Provide Connection Via Jumper (Right click to bend the wire by 45 degrees)

48. A Sample Layout

49. Display only the necessary Metal Layers

50. Print Only Necessary Metal Layers (Show Bottom trace, pads, and via)