4/1/2024 0 Comments Protel 99se![]() 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.
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