八位抢答器数电课设报告.docVIP

八路抢答器电路的设计 摘 要 本文介绍了一种用74系列常用集成电路设计的数码显示八路抢答器的电路组成、设计思路及功能。该抢答器除具有基本的抢答功能外，还具有定时、计时和报警功能。主持人通过时间预设开关预设供抢答的时间，系统将完成自动倒计时。若在规定的时间内有人抢答，则计时将自动停止若在规定的时间内无人抢答，系统中的蜂鸣器将发响，提示主持人本轮抢答无效，实现报警功能。 NI Multisim软件结合了直观的捕捉和功能强大的仿真，能够快速、轻松、高效地对电路进行设计和验证。凭借NI Multisim，您可以立即创建具有完整组件库的电路图，并利用工业标准SPICE模拟器模仿电路行为。本设计就是利用Multisim软件进行电路图的绘制并进行仿真。关键词: 八路, 抢答器, 设计,定时，计时，报警 MultisimAbstract This article describes a series of commonly used integrated circuit design with 74 shows eight-way digital answering device circuit design ideas and features. The Responder Responder addition to a basic function, but also with a timer, time and alarm functions. Host switch by default for the answer in time for the default time, the system will automatically countdown to complete. If people answer in the required time, then the time will automatically stop and answer in the digital control circuit to display the median player. Be a circuit display countdown time, buzzer alarm. If nobody answer in a specified time period, will be shown the circuit 00, while the system will be sent in the buzzer sound, suggesting that host this round of Responder invalid, an alarm function. ????NI Multisim software combines intuitive capture and powerful simulation to quickly, easily and efficiently on the circuit design and verification. With NI Multisim, you can immediately create a complete library of circuit components, and use industry-standard SPICE circuit simulator imitating behavior. This design is the use of Multisim circuit diagram drawing software and simulation. Keywords: 8-wire, answering racer, design, timing, counting, alarming，Multisim 摘 要 I Abstract II 1.设计准备 1 1.1引言 1 1.2 Multism介绍 1 2.设计方案选择 2 2.1 采用数字电路 2 2.2采用单片机 3 2.3采用PLC 3 2.4方案选择 4 3.数字电路多路智能竞赛抢答器原理图设计 5 3.1设计任务及系统功能简介 5 3.2数字抢答器总体方框图 5 3.3单元电路设计 6 3.3.1抢答器电路设计 6 3.3.2 定时电路设计 10 3.3.3秒脉冲产生电路 11 3.3.4报警电路的设计 12 3.3.5时序控制电路 13 4.电路的部分仿真 16 4.1抢答电路的仿真 16 4.2秒脉冲波形仿真 16 4.3定时电路的仿真 17 4.4全局电路的仿真 18 5.抢答器实物的制作 21 5.1抢答部分实物的制作 21 5.2定时电路部分实物的制作 21 5.3报