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多功能数字钟

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摘要 [来源:http://www.think58.com]

现在数字电子钟已经成为人们日常生活中必不可缺少的必须品,与传统的机械钟相比,它具有走时准确----采用高稳定度的石英晶体振荡器作时钟源;与传统的机械钟相比,它显示直观----用夜晶或荧光七段数码管显示器;与传统的机械钟相比,没有机械传动装置,不受天气、以及外界环节的影响。广泛用于家庭及车站、码头、剧院、办公室等公共场所,给人们的生活、学习、工作、娱乐带来了极大的方便。 [资料来源:www.THINK58.com]

本系统由数字钟电源、石英晶体振荡器、分频器、计数器、译码器、LED显示器和校时电路组成,采用了数字电路中小规模集成芯片。总体方案设计由主体电路和扩展电路两大部分组成。其中主体电路完成数字钟的基本功能,扩展电路完成数字钟的扩展功能,进行了各单元设计,总体调试。

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关键词:石英晶体振荡器;分频器;计数器;译码器;LED显示器

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Abstract [资料来源:http://www.THINK58.com]

Nowadays digital electronic clock has been the things that could not be lack in people’s daily life, compared with traditional mechanical clock it has adopted the silicon crystal oscillator of high stability to be power; comparing with traditional mechanical clock, it is easily to be watched because of the LED indicator; comparing with traditional mechanical clock, it does not has the mechanical drive devices, weather and environment outside cannot effect it. So it is widely used in station、wharf、cinema、office and other public place, bringing much convenience to people’s life、study、work、entertainment and so on. [版权所有:http://think58.com]

The system is made up by digital clock power, silicon crystal oscillator, frequency divider, number counter, decipherer, LED indicator and calibrated circuit and utilized the medium-sized and small-sized integrated chip of digital circuit. The design for the overall project is composed of two circuit and the expended circuit, The main circuit carries on the basic function of the digital electronic clock and the expended circuit carries on the expended function of it. Each unit is designed and overall adjustment is performed.

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Key words: silicon crystal oscillator; frequency divider; number counter; decipherer; LED indicator

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目   录 [来源:http://think58.com]

绪论………………………………………………………1 [版权所有:http://think58.com]

第一章 设计概况…………………………………………………3 [资料来源:www.THINK58.com]

1.1 设计要求…………………………………………………………3

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1.2 设计内容…………………………………………………………3

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1.3 设计方案…………………………………………………………3

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1.4 设计器材…………………………………………………………4

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第二章 电子钟双输入电源………………………………………5 [来源:http://www.think58.com]

2.1 交流电源…………………………………………………………5

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2.2 直流电源…………………………………………………………7

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第三章 石英晶体振荡器…………………………………………8

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3.1 振荡器的选定……………………………………………………8

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3.2 石英晶体的特性………………………………………………9

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3.3 石英晶体振荡电路……………………………………………10 [版权所有:http://think58.com]

3.4 元件的选择……………………………………………………11

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3.5 石英晶体元件的种类及其型号………………………………12 [资料来源:www.THINK58.com]

第四章 分频器…………………………………………………13 [资料来源:http://THINK58.com]

4.1 分频器元件的选择……………………………………………13

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4.2 同步十进制加法(——)数器74LS160的工作原理………………14 [资料来源:THINK58.com]

4.3 分频器的工作原理……………………………………………16 [资料来源:THINK58.com]

第五章 计时器…………………………………………………19 [版权所有:http://think58.com]

5.1 六十进制计数器……………………………………………….19 [资料来源:THINK58.com]

5.2 二十四进制计数器……………………………………………21 [资料来源:www.THINK58.com]

5.3 组成小时,分钟,秒计数器…………………………………23

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第六章 电子钟的译码和显示…………………………………26 [资料来源:http://www.THINK58.com]

6.1 译码芯片7448…………………………………………………26 [资料来源:THINK58.com]

6.2 七段数码显示器………………………………………………27

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6.3 工作原理图………………………………………………………28

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第七章 校时电路…………………………………………………29 [资料来源:www.THINK58.com]

第八章 电子元件的选择………………………………………………………30 [资料来源:THINK58.com]

8.1 回路电流 ……………………………………………………………………………30

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8.2  二极管的选用 ……………………………………………………………………31

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结论……………………………………………………………….31

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参考文献…………………………………………………………32 [资料来源:THINK58.com]

致谢………………………………………………………………33

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附录  1……………………………………………………………………………元件列表 [来源:http://think58.com]

附录2………………………………………………………接线图 [资料来源:http://think58.com]

 

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Tags:多功能 功能 数字  [资料来源:http://think58.com]

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