PCB LAYOUT技術大全---初學者必看！
PROTEL相關疑問
1.原理圖常見錯誤：
（1）ERC報告管腳沒有接入信號：
a. 創建封裝時給管腳定義了I/O屬性;
b.創建元件或放置元件時修改了不一致的grid屬性,管腳與線沒有連上;
c. 創建元件時pin方向反向,必須非pin name端連線。
（2）元件跑到圖紙界外：沒有在元件庫圖表紙中心創建元件。
（3）創建的工程文件網絡表只能部分調入pcb：生成netlist時沒有選擇為global。
（4）當使用自己創建的多部分組成的元件時,千萬不要使用annotate.
2.PCB中常見錯誤：
（1）網絡載入時報告NODE沒有找到：
a. 原理圖中的元件使用了pcb庫中沒有的封裝;
b. 原理圖中的元件使用了pcb庫中名稱不一致的封裝;
c. 原理圖中的元件使用了pcb庫中pin number不一致的封裝。如三極管：sch中pin number 為e,b,c, 而pcb中為1,2,3。
This a full 3-tier dababase application which includes a activex dll project(business objects) and a standard exe(UI). Besides all the database techniques it demonstrates, it also shows how to make MSHFlexgrid a editable grid(with combobox, checkbox, datetimepicker) and how to merge a toolbar for multi forms.
This a very simple Yee algorithm 3D FDTD code in C implementing the free space form of Maxwell s equations on a Cartesian grid. There are no internal materials or geometry. The code as delivered simulates an idealized rectangular waveguide by treating the interior of the mesh as free space/air and enforcing PEC (Perfect Electric Conductor) conditions on the faces of the mesh.
The C# program will display a mine field, plant mines, and provide hints on the number of mines around each grid. The player can therefore enjoy a typical Minesweeper game on a Smartphone.
LINEINTRGAL Line Integral in a 2D Vector Field.
LINEINTRGAL(X,Y,U,V,C) computes the line integral along the lines given in cell array C.
X and Y define the coordinates of a rectangular grid over which
U and V are defined. X and Y must be monotonic and 2D plaid as
％ produced by MESHGRID. X, Y, U, and V must all be the same size.
