PCB Design and Fabrication

Content

1. Prepare your circuit artwork.2. Exposing3. Developing4. Trouble shooting5. Etching

Prepare your circuit artwork

1. We need a schematic diagrami. Design by ourselves ii. Readymade (Internet, datasheet etc)

Eg. https://www.arduino.cc/en/Main/ArduinoBoardUno

2. What should we have on the schematic?i. Circuit diagram.ii. Name of the part used.

3. Software to design PCBi. Eagle (http://www.cadsoftusa.com/)ii. Proteus(http://www.labcenter.com/products/pcb/schematic_intro.cfm)iii. Pads (https://www.pads.com/)

1

PCB Design Tutorial using Eagle Software

• Installing– Download trial from http://www.cadsoftusa.com/download-eagle/

1 Prepare your circuit artwork

Create new project>File > New >Project

A new project folder is made under the project. Set the name of the project folder by renaming.

When the project is working, it isn't possible to change the name. In this case, select "Close Project" from the menu. When a project is closed, the green mark changes to the small gray mark.

1Starting a New Project

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The file to draw a schematic must be made after creating a project.

Select "New" from the menu which is displayed by right clicking the project and select "Schematic".

By above operation, the window to draw a schematic is displayed newly.In this condition, an actual file isn't made yet.

1Create Schematic File

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Select File menu and select "Save as...". The file is made with this operation.

Write the name of the ‘schematic’. A file of .sch is saved by pushing the Save button.

1Create Schematic File

Prepare your circuit artwork

1Create Board File

Prepare your circuit artwork

In the project, another important file must be created…called the board to draw the mask pattern for the printed board. The board file can be created after drawing a schematic. When adding a part to the schematic, a part is added to the board, too. So, when drawing a schematic, it is necessary to keep a board file always open condition.

Click "Board" icon in the schematic window

When a board isn't made yet, board creating is confirmed by following dialog.

1Create Board File

Prepare your circuit artworkFollowing board window is displayed. In this condition, an actual file isn't made yet.

A board file is made by clicking "Save" icon in the board window.The file name is same as the schematic file. But, the extension is ".brd"

1Schematic and Board File Created

Prepare your circuit artworkThe existence of the schematic file and the board file can be confirmed by the project folder of the control panel.

The working environment was ready with above operations.

1Selecting and Adding Parts

Prepare your circuit artworkTo make the mask pattern of the printed board, the schematic must be drawn. The part which is used with the schematic is chosen from the one which is registered on the library.

Click the "ADD" button which is put on the left side in the schematic window. NOTE: this screen is displayed

when the “use” status is active, marked by green bullet. Right click the Library folder and click Use All.

1Selecting and Adding Parts

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When pushing the OK button, a part is displayed on the schematic. Push the left button of the mouse in the position. Click one more to get another same part.

To stop the addition function of the part, push an ESC key and "Cancel" button in the schematic window

1Wiring Parts

Prepare your circuit artwork

After we put the component, then wiring can be done by the Wire function. Left click the lead wire of the part and double-click at the end point which of wiring. It isn't necessary to keep to push the mouse button during wiring work. To stop this feature, press STOP button.      

The drawn line can be erased using the Delete button.

1Exercise!

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Draw this circuit now!.. A 5 volt voltage regulator circuit.

After drawing a schematic, the mistake can be automatically detected by the ERC (Electrical Rule Check) button.

1Exercise!

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Part Value Package Library Units

D1 - D4

1N4148DO35

-7 DO35-7 diode 4K1 - K4 G5V-2 G5V-2 relay 4LED1 - LED4 LED3MM led 4

Rx 1k 0207/7 rcl 8Rx 10k 0207/7 rcl 4

T1 - T4 2N3904 TO92 transistor 4VS-6V VS-6V 22-23-2021 con-molex 1

VS-6V1 VS-6V 22-23-2021 con-molex 1X1 22-23-2041 22-23-2041 con-molex 1X2 22-23-2041 22-23-2041 con-molex 1

MOTOA MOTOA 22-23-2021 con-molex 1MOTOB MOTOB 22-23-2021 con-molex 1

Part List

1Creating Board file

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When the schematic drawing is ready, click Board button from schematic file. The yellow line among the parts is the line which shows a connection among the parts. But, these lines are not wiring for the printed board yet.

1Parts arrangement on the board

Prepare your circuit artworkThe parts of the board are arranged out of the printed board. After pushing the Move button, move the parts inside the frame. We can also put text inside.

The yellow line shows a connection among the parts.The part should be arranged for the yellow line to be simpler.

1Autorouting on the board

Prepare your circuit artworkAutomatically wiring is done by the "Auto" button.