(1) Principle of drawing circuit diagram.

?This is the basis of circuit board design, mainly to complete the drawing of circuit schematics and generate network reports.

(2) Planning the circuit board.

?Before drawing the circuit board, the user should make a preliminary plan for the circuit board, including setting the physical size of the circuit board, adopting several layers of circuit boards, packaging and mounting of components, etc. This determines the framework for the design of the subsequent printed circuit board.

(3) Set parameters.

?Mainly set the distribution parameters and wiring parameters of the components. Usually these parameters can be selected from the default values of the system, or there is no need to modify them after one setting.

(4) Component packaging.

?The so-called component packaging is the shape of the component, and every component installed on the printed circuit board should have a corresponding package, so as to ensure the normal wiring of the circuit board.

(5) Component layout.

?After the circuit board is planned, the components can be placed in the circuit board frame, and the automatic wiring function provided by protel 99 SE can be used to automatically route the components.

(6) Automatic wiring

?Protel 99 SE provides a powerful automatic wiring function, which can automatically route the arranged components. In general, automatic wiring will not go wrong.

(7) Manual adjustment

?After the automatic wiring is completed, the user can adjust the more special components to ensure compliance with the corresponding rules, so as to ensure that the anti-interference of the circuit board reaches the standard.

(8) Save the output.

?After the components are wired and adjusted correctly, the final design of the printed circuit board is completed, and then the drawing is printed and the output is saved