![]() (e) of 1.27 mm or 50 mil and wizard wont allow you to change this value. 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. First of all, we need to create a new PCB library or open an existing one. Minimum Annular Ring on the Outer Layer: 0.05 mm. Ring Border) 2 + (Tolerance Allowance) + (Hole Size) Minimum Annular Ring on the Inner Layer: 0.1 mm. 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. A nice shortcut as youre populating the schematic is pressing ESC, which will pop up the library, and one can move on to the next part automatically. The pad size needed to support a drill bit depends on the size of the annular ring placed around a hole, the hole size, and the tolerance: Minimum Annular Ring (Min. 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 Comments
Leave a Reply. |