具有定時(shí)功能的八路數(shù)顯搶答器的設(shè)計(jì)

全文14頁 約8000字 論述翔實(shí)

摘要:
本文介紹了一種用74系列常用集成電路設(shè)計(jì)的數(shù)碼顯示八路搶答器的電路組成、設(shè)計(jì)思路及功能。該搶答器除具有基本的搶答功能外，還具有定時(shí)、計(jì)時(shí)和報(bào)警功能。主持人通過時(shí)間預(yù)設(shè)開關(guān)預(yù)設(shè)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效，實(shí)現(xiàn)報(bào)警功能。
關(guān)鍵詞:
八路, 搶答器, 設(shè)計(jì),定時(shí)，計(jì)時(shí)，報(bào)警

Abstract：
In this paper, the electric circuit and designing thought of an answering racer based on the common-used series of 74 IC with 8-wire is introduced, and its function is also described. The answering race’s function includes timing, counting, and alarming, besides the basic function of an answering racer. The host sets the provided time for the answering race through the time-setting switch, after this the system will count down the time automatically. If anybody answer the question on time, the counting of time will stop; 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:
8-wire, answering racer, design, timing, counting, alarming

部分參考文獻(xiàn)

1. 康華光 編<<電子技術(shù)基礎(chǔ) 數(shù)字部分>>,北京 高等教育出版社,2000年6月版.
2. 李海 編<<74系列芯片手冊>> ,重慶 重慶大學(xué)出版社 1999年9月版.
3. 歐陽星明 編<<數(shù)字邏輯>>，武漢 華中科技大學(xué)出版社，2002年5月版