The signal of this VIA can be defined as a signal of VCC or GND (ie, the signal of the inner layer). How to add a VIA to Thermal in the PCB part of PROTEL? Just make these several circuit diagrams into a hierarchical relationship, using All document. setup printer\batch type\ select all document? How to print the image in the *.ddb at a time. You can click on one of the component fonts and use the Global method to achieve the requirements. How can I change the font of all components at once? You can set the size of the grid to be small, and you can reduce the size of the font and then place the square of the number. How do I indicate the square of the wire diameter? Switch to the P-CAD 2000 file format for Protel to read. Protel 99SE can only read P-CAD 2000 ASCII file format, so you must first format P-CAD 8.6 How to successfully read the circuit diagram of the pcad8.6 version? You can click the pin of the part when you make the part in the library, and in the Electrical Type, you can set the PIN yourself. How to decide is Passive, Input, I/O, Hi-Z, Power.? Can you find a description in HELP? Make a PIN attribute of a part in SCHLIB. You can add rule settings in the rules of Design/Rule/High Speed/Matched Net Lengths first, and then use Tools/EqualizeNet Lengths to equalize. How to make the distance from one wire to two different parts? In addition, in electronic products with both analog and digital circuits, the printed boards often separate their ground lines to form an independent grounding grid, which can also be used as a basis for identification and judgment.Q01. When the factory is wiring the printed circuit board, in order to prevent self-excitation and anti-interference, the ground copper foil is generally set to the widest ( high-frequency circuits often have large-area grounded copper foil), the power supply copper foil is second, and the signal copper is used.
The power and ground lines can also be found from the three-terminal regulator pins. Taking the power supply circuit as an example, the negative terminal of the rectifier connected to the secondary of the power transformer is the positive pole of the power supply, and a large-capacity filter capacitor is generally connected between the ground and the ground, and the capacitor casing has a polarity mark. Correctly distinguish the ground, power and signal lines of the printed board.
0 kommentar(er)
