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Have to know the PCB design skills

Posted:11:55 AM October 26, 2018 writer: G

1. How to add the original tango library in protel99 (such as TTL.LIB/COMS.LIB, etc.)

To add a library to protel99: Import it in your own ddb file (the current project file or another one dedicated to the library). The lib file, then add the one you just added to the "add/move" dialog in the "browse liberary" box of the schematic editing environment. Ddb file, you can find the added library after you choose ok. However, the library in tango you said is in the "protel dos schemetic liberarys.ddb" file of peotel99. You don't need to add it. The above method can be used to add the library provided by yourself or the collaborator.

2.GERBER has two formats:

RS274D contains XY DATA, no D-CODE file, the customer should give the corresponding D-CODE file.

RS274X contains XY DATA, and D-CODE is also defined in this file.

The D-CODE file (APERTURE LIST) is the ASC II text format, which defines the size, shape and exposure of the D-CODE.

3. Why is the PCB file designed by Protel software of DOS version transferred to my computer?

There is a problem with the memory configuration. You only need to add the following lines to your CONFIG.SYS file (this file is in the C: root directory, if not, create one), save the disk and exit and restart the computer.




4. Why do you need to convert the PCB file to GERBER file and drilling data and hand it to the PCB factory board?

Because electronic engineers and PCB engineers have different understandings of PCBs, the GERBER files converted by the PCB factory may not be what you want. If you design the parameters of the components in the PCB file, you don't want these parameters to be displayed. On the finished PCB, you have not explained, the PCB factory will leave these parameters on the finished PCB according to the gourd painting. This is just an example. This can be avoided if you convert the PCB file to a GERBER file yourself.

The GERBER file is an international standard lithography format file, which includes RS-274-D and RS-274-X formats. RS-274-D is called the basic GERBER format and must be accompanied by a D code file. A complete description of a graphic; RS-274-X is called the extended GERBER format, which itself contains D code information. Commonly used CAD software can generate these two format files.

How to check the correctness of the generated GERBER? Simply import these GERBER files and D-code files into the free software Viewmate V6.3 to see them on the screen or through the printer.

Drilling data can also be generated by various CAD software. The general format is Excellon, which can also be displayed in Viewmate. Without drilling data, of course, you can't make PCBs.

5. A brief introduction to the unit of the Gerber file

Example 1:

D10 Round 25 0

D11 Square 28 0

D12 Rect 15 80

This Dcode unit is obviously mil, and if read as mm or inch, it will be significantly larger.

Example 2:

D10 Round 0.025 0

D11 Square 0.028 0

D12 Rect 0.015 0.08

This Dcode unit is obviously inch, and it will be significantly smaller if read as mm or mil.

Example 3:

D10 Round 0.6 0

D11 Square 0.55 0

D12 Rect 0.2 1.0

This Dcode unit is obviously mm, if it is read as inch or mil, it will be obviously small/large.

* The pad or line is obviously too large, which is aperture unit error and should be moved. Arl file*

6. PowerPCB file conversion Protel format file

1.powerpcb-->export ascii file--->import ascii file with protel99 se sp5(u must install padsimportor that is an add-on for 99sesp5 which can downloan from protel company ).

2.powerpcb-->export ascii file-->import ascii file in orcad layout-->import max file(orcad pcb file)with protel 99 or 99se.

3. Use CAM350 v6.0 File->Import->CAD Date->PADS/PowerPCB

Additional supplements:

1. If you only want to transfer the file to Protel, you can choose to save it as DXF file in the output of PowerPCB, and then open it with CAM350, AutoCAD2000, Protel.

2. You can also export the Gerber file on the PowerPCB, import it with CAM350, export it to DXF file format or other format with CAM350, and then import it with Protel.

7.Protel FOR DOS version of the shortcuts list

During the use of Protel FOR DOS version, there are a lot of shortcut keys, and mastering and utilizing these shortcut keys skillfully can greatly improve the speed of drawing.

TRAXEDIT: F1: Place a pad; F2: Delete a pad; F3: Place a wire;

F4: fast save; F5: fast switch to the top; F6: quickly switch to the bottom;

F7: interrupt a line; F8: delete a line;

F9: Make the current mouse position coordinate (0, 0);

ALT-X: Quick exit (no disk exit)

SCHEDIT: F1: Place a node; F2: Delete a node; F3: Place a wire;

F4: fast save; F5: reduce window; F6: enlarge window;

F7: MOVE END OF LINE ; F8: delete a line;

ALT-X: Quick exit (no disk exit)

Universal shortcuts:

HOME: Refresh the screen centering on the current mouse position.

END: Refresh the screen. Unlike HOME, the screen position will not move.

"+, -" on the keypad: Quickly switch layers.

PAGE UP, PAGE DOWN: Zoom in and out of the screen.

Up, down, left and right buttons: jog the cursor.

8246 button on the keypad: Move the cursor quickly.

8. The function menu is not displayed completely?

If we don't show up when opening some dialogs (for example: Preferences option), click the big arrow to the left of File and select "√" in PreferencesUse Client System Font For All Dialogs to remove it.

9. Sometimes open the toolbar, the toolbar does not display?

When designing the schematic, sometimes open the design toolbar, the toolbar does not display, select customizetools in the large arrow on the left side of the File, set the position of the toolbar.

10. Schematic device library designed with Protel low version, can't be edited in Protel99 SE?

Because Protel99 SE adopts the management method of database, its library file also exists in the form of database. Therefore, we first open and save the original library file under Protel99 SE. The DDB file can be edited.

11. How to make a template in the PCB?

Use the PCB navigator in the new file to generate the special template you need, and store the template at the end of the navigator. In the future, you can directly call the name of the template you stored in the Navigator.

12. How to load simulation and PLD libraries?

In the simulation analysis and PLD design, the simulation library and the devices in the PLD library must be used. The library files are in sim.ddb and pld.ddb in the Design Explorer 99 SElibrarysch directory.

13. What is the name of the generic device library for the schematic?

The common device file library for schematics is Miscellaneoous Devices.ddb.

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