介绍了在Protel 99SE环境下绘制数字钟电路原理图和设计PCB的过程和方法。这种设计方法简便，易于掌握，适合电子类学生进行电子产品的设计与制作。%The article introduces the process and methods of creating the schematic diagram and designing the printed circuit board of the multi-purpose digital clock circuit with Protel 99SE. The design method is convenient and easily for the students ma-joring in electronics to design and make the electronic products.
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