【正文】 1 數(shù)字搶答器設(shè)計(jì) 摘 要 隨著科學(xué)研究的不斷深入，學(xué)習(xí)科學(xué)、技術(shù)、知識(shí)的手段日益增加。搶答器作為一種工具，在智力和知識(shí) 競(jìng)賽 場(chǎng)合已經(jīng)得到了廣泛的應(yīng)用。因此，搶答器的設(shè)計(jì)成為研究的熱點(diǎn) 。 本文基于 74 系列的常用集成電路 設(shè)計(jì)了一種 多功能數(shù)顯搶答器 ，該搶答器 除了具有基本的搶答功能之外，還具有定時(shí)報(bào)警 、 數(shù)顯的功能 。在設(shè)計(jì)的過(guò)程中考慮了 八路搶答器 ，的電路組成、設(shè)計(jì)思路及功能 。 搶答器主要由搶答模塊、定時(shí)模塊和報(bào)警模塊組成， 利用Multisim10 軟件 對(duì)所設(shè)計(jì)的電路 進(jìn)行仿真，結(jié)果得到當(dāng) 預(yù)設(shè) 過(guò) 供搶答的時(shí)間，系統(tǒng)將完成自動(dòng)倒計(jì)時(shí)。若在規(guī)定的時(shí)間內(nèi)有人搶答，則計(jì)時(shí)將自動(dòng)停止；若在規(guī)定的時(shí)間內(nèi)無(wú)人搶答，則系統(tǒng)中的蜂鳴器將發(fā)響，提示主持人本輪搶答無(wú)效，實(shí)現(xiàn)報(bào)警功能。 關(guān)鍵詞： 八路搶答器； EDA； Multisim10； 報(bào)警 ； 數(shù)顯 The design of digital answering racer ABSTRACT With the deepening of the scientific research, means of learning science, technology, knowledge getting more figure vies for the answering device as a tool has been widely used in the intelligence and knowledge petition situation. Therefore, the design of the figure vies for the answering device is being a hot spot of research. Based on monused series of integrated circuit ,this paper design a multifunction digital display responder. The answering race’s function includes timing, counting, and alarming, besides the basic function of an answering racer. Considered circuit position, function and design ideas in the design process of the eightway responder. The designed buzzer is mainly posed of vies to answer first module, timing module and alarming modul. Through the Multisim10 to carry on the design of simulation, the experimental results show when the time of buzzer has preset, the system will plete automatic countdown. If nobody answer the question on time, the alarm will give out some sound, helping the host know the race in this turn is of no use, so the function of alarming is achieved. Keywords:eightway responder。 Multisim10。 alarming。 digital display 2 目 錄 一 、引言 .......................................... 4 研究背景及意義 ............................................................... 4 研究現(xiàn)狀 .......................................................................... 4 本文主要工作 ................................................................... 5 二 、 Multisim10 以及搶答器的簡(jiǎn)介 ..................... 6 Multisim10 的簡(jiǎn)介 ............................................................ 6 Multisim10 界面基本操作 ........................................ 6 Multisim10 使用的注意事項(xiàng) .................................. 10 搶答器的簡(jiǎn)介 ................................................................ 10 搶答器的需求分析 ................................................. 10 搶答器的工作流程 ................................................. 10 三 、電路設(shè)計(jì)的具體實(shí)現(xiàn) ............................ 13 系統(tǒng)概述 ........................................................................ 13 搶答器的組成框圖 .................................................. 13 搶答器的基本功能以及擴(kuò)展功能 ........................... 14 單元電路設(shè)計(jì)和分析 ..................................................... 15 搶答電路的設(shè)計(jì) ..................................................... 15 定時(shí)電路的設(shè)計(jì) ..................................................... 16 報(bào)警電路的設(shè)計(jì) ..................................................... 18 整機(jī)電路 ................................................................. 18 3 四 、仿真實(shí)驗(yàn) ...................................... 20 搶答電路仿真 .............................................................. 20 定時(shí)電路仿真 .............................................................. 21 報(bào)警 電路仿真 .............................................................. 22 系統(tǒng)故障的分析 .......................................................... 24 搶答鎖存顯示電路故障 —— 開(kāi)路 ........................... 24 定時(shí)顯示報(bào)警電路故障 —— 短路 ........................... 24 時(shí)鐘信號(hào)產(chǎn)生電路故障 ——開(kāi)路 .......