Express PCB tutorial

Virtually every electronic product is constructed with one or more printed-circuit boards (PCBs). The PCBs hold the ICs and other components and implement the interconnections between them. PCBs are created in abundance for portable electronics, computers, and entertainment equipment. They are also made for test equipment, manufacturing, and spacecraft.

1. Express PCB Presented by- Kunal Pandhram 1 ElectrohybridTech

2. Double click on ExpressPCB icon . Click on ‘Place a component’ Select required footprints and place on board. If any of the footprint is not available in library, create new footprint. Label footprints. Ensure to use same labels as used in Express schematic. Arrange footprints properly Link Circuit schematic to ExpressPCB . Use ‘Place a trace’ to connect highlighted pads. Rearrange footprints if necessary to attain satisfactory layout. Steps to create PCB layout using ExpressPCB electrohybridTech 2

3. Practice circuit LDR, Power supply to be connected off board via 4-pin connector Copy file TimerSwitch.sch on PC where you are working with Express PCB electrohybridTech 3

4. Double click on ExpresspPCB icon electrohybridTech 4

5. ExpressPCB screen shot electrohybridTech 5

6. Click on ‘Place a component’ electrohybridTech 6

7. Select desired footprint from library electrohybridTech 7

8. Place footprint on board electrohybridTech 8

9. Double click on footprint. Give label as per schematic diagram electrohybridTech 9

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11. Component Label Express PCB footprint Capacitor (Electrolytic) C1 Cap-Radial Electrolyte Lead Spacing0.138inch Capacitor (non-electrolyte) C2 Cap-Lead spacing 0.2 inch ¼ watt resistors R2,R3,R4 Resistor 0.25watt(lead spacing 0.4inch) Potentiometer VR1 Potentiometer-Bourns-series3386F LED D LED T 1.75 IC 555 IC DIP-8 Transistor SL100 Q TO-39 Connector CON Connector-Molex-.1inchKK,up 4 pin Express PCB Library footprints- parts ID names electrohybridTech 11

12. Select and place all available components in library electrohybridTech 12

13. Creating new footprint Ensure you have following information – Pin arrangement and dimensions Pin identification Pin numbers as assigned in Express Schematic electrohybridTech 13

14. Pin arrangement and dimensions Pin identification Pin numbers as assigned in Express Schematic electrohybridTech 14

15. Click on ‘View’ Select ‘Options” electrohybridTech 15

16. Note grid spacing electrohybridTech 16

17. 1. Click on ‘ Place a pad’ 2. Select pad dimensions 3. Place pad on grid point electrohybridTech 17

18. Copy pad Paste 4 more pads on board As corner pads are 12mm(0.5inch) apart, place corner pads considering grid spacing 0f 0.1 inch Place central pad 0.1 inch above and at middle of top corner pads. electrohybridTech 18

19. 1. Click on ‘ place a trace ‘ 2. Select silkscreen layer 3. Draw footprint outline electrohybridTech 19

20. Double click on each pad and assign pin numbers. Pin numbers should be consistent with pin numbers of Express Schematic component 2 1 5 4 3 electrohybridTech 20

21. Select whole component Open ‘component’ menu Select ‘ Group to make component’ electrohybridTech 21

22. Double click on component Assign part ID ( Label) same as in Express Schematic electrohybridTech 22

23. Now start arranging footprints within board area Start with component from which many branches are emerging, like IC. Place other components such that they are near to IC pins and cross over are avoided electrohybridTech 23

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25. Go to file Select option ‘ Link schematic to PCB Select file to be linked. TimerSwitch.sch in this case. electrohybridTech 25

26. Now click on ‘Place a Trace’ Click on One of the pads. Pads to be connected are highlighted in blue. Footprints can be rearranged as and when required at any stage electrohybridTech 26

27. R4 is rearranged. Diode D is rotated electrohybridTech 27

28. Now start routing- Click on ‘place a trace’ 2. Select trace width of 0.050” Click on one of the pads. Place trace between highlighted pads electrohybridTech 28

29. Change trace width to 0.030’ while connecting pads internally. electrohybridTech 29

30. R3,R4,LED,Transistor, VR1 are suitably rearranged to avoid cross over. Text is added for reference and easy identification. electrohybridTech 30

31. Select whole layout. Move close to top left corner. Drag corners to adjust board size. electrohybridTech 31

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33. Place holes for mounting screws electrohybridTech 33

34. Go to ‘File’ menu. Select ‘Print’ option Check ‘ Silkscreen, pads, and text’ layer And take print on normal paper Take print on normal print paper electrohybridTech 34

35. Select whole Layout. Move the Layout to bottom copper layer. Click to move selected layout to bottom copper layer electrohybridTech 35

36. Go to ‘File’ menu. Select ‘Print’ option Check ‘Bottom copper layer’ Take two prints- one on photographic sheet, other on normal print paper electrohybridTech 36

37. electrohybridTech 37 Thank You ! For more details- LinkedIn/ electrohybridTech