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

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Presentation on theme: "Produce Your Own PCB Board Jack Ou Engineering Science Sonoma State University."— Presentation transcript:

1 Produce Your Own PCB Board Jack Ou Engineering Science Sonoma 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

5

6

7

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

26 Reduce the Active Area Hieight is 2.5 inches

27

28

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 – Drill (Assumptions: 1. drill bit is approximately 31 mils in diameter 2. wire size is 29 mils) – Diameter (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)

51 Display top layer problem

52 Print Top Layer

53 Print the Bottom Layer

54 Print the Layout to a Transparency

55 Run the transparency through the laser printer twice to produce better transfer Practice with regular paper before you use transparency. Look at your layout on paper and see if it will work at all.

56 Final Printout

57 Cut the Transparency

58 PCB Development With contribution from Kevin Zack

59 Cut the PCB Board Please clean up after you are done!

60 Smooth out the rough edge with Dremel

61 Clean the PCB with a scotch pad or fine sandpaper

62 When the board is shiny, use acetone to remove any oil or grease on the board

63 General Procedure Transfer Image 1.Run the transparency through the laser printer twice to produce better transfer. 2.Tape the printed transparency on to the a cleaned PCB board. 3.Heat a hobby iron. With light pressure, iron the transparency onto the copper. 4.After the board has cooled, peel off the transparency. 5.Use Sharpie to complete image transfer

64 Details Instruction for Double Sided PCB Line up the bottom layer with the top layer (with the ink side facing the PCB)

65 Details Instruction for Double Sided PCB Make sure it can go on the PCB

66 Details Instruction for Double Sided PCB Slide in the PCB (Kevin Zack)

67 Details Instruction for Double Sided PCB Tape the transparency to PCB

68 Tape the printed transparency on to the a cleaned PCB board (Single Sided PCB)

69 Heat a hobby iron. With light pressure, iron the transparency onto the copper Use highest Setting-- 3

70 You can also try the laminator

71 After the board has cooled, peel off the transparency.

72 Failed Image Transfer

73 Use Sharpie to Repair PCB Board

74 Precaution Etching Solution may leave stain on skin and utensils. The use of rubber gloves is recommended. Avoid prolonged or repeated breathing of vapor or contact with skin.

75 Develop PCB 1.Ferric Chloride is used to remove the copper not protected by the toner. 2.Place the printed board into a container with a lid and pour about ¼” of the acid solution over the board. 3.Secure the lid and using a swirling motion, agitate the solution for 15 minutes to 30 minutes until the unwanted copper is removed. 4.After the excess copper is removed, pour water over the board to halt the etching process. 5. Dispose the left over chemical properly. (Include the chemical rinsed off with water)

76 Ferric Chloride

77 Place the printed board into a container with a lid and pour about ¼” of the acid solution over the board

78 Agitate the solution

79 You can also try the orbital shaker

80 Dispose Chemical Properly

81 Post Processing Clean off the toner protecting the traces with a scotch pad or sandpaper. Clean off any residue with acetone. Drill the board with a drill press. (Use 31 mil drill bit)

82 Remove Ink (Before) (After)

83 Drill Holes

84 Misc Slides


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