555定时器及其三种典型应用电路比较

555定时器是一种通用的集模拟与数字功能于一体的中规模集成电路,利用这种集成电路,只要在其外部配上几个适当的阻容元件,就可构成施密特触发器、单稳态触发器以及多谐振荡器三种典型应用电路。对555定时器内部电路进行等效简化,同时对555定时器的三种典型应用电路进行比较分析,以求教与学均达到事半功倍的效果。     

浅谈555定时器的原理及其应用

555定时器是一种应用十分广泛的中规模集成电路。本文扼要地分析了555定时器的基本原理，并较为详细地介绍了用555定时器构成的单稳态触发器、双稳态触发器、多谐振荡器、电压一频率转换器的原理。最后给出了555定时器在日常生活中的几个具体应用电路。     

关于555定时器逻辑功能的讨论

从基本RS触发器功能出发,对555定时器的逻辑功能进行了讨论,认为555集成定时器高电平触发端加小于2Ucc /3的电平,低电平触发端加小于Ucc /3的电平时,触发器置"1".     

555定时器的功能分析与应用综述

555定时器是一种用途十分广泛的集成电路，通常只要外接几只阻容元件，就可以构成各种不同用途的脉冲电路，如多谐振荡器，单稳态触发器以及施密特触发器等，本介绍了555定时器的基本功能，并就其应用进行归纳总结。     

基本RS触发器电路结构教学探讨

基本RS触发器是最简单的触发器,是构成其它类型触发器的基本单元.     

双稳态触发器教学思路的研究

为解决触发器教学内容杂、学时少的问题,结合教学经验,提出优化的教学思路:一方面以基本RS触发器为结构模块,简化钟控RS、D、JK等触发器的工作原理的分析,从而提高教学效率;另一发面,以功能改进为主线,遵循各触发器内在结构的联系,通过电路结构的完善,顺序展现几种重点研究的触发器,使得教学富于逻辑性。文中给出基本RS触发器教学难点的解决和触发器教学思路流程图。     

555定时器的应用研究

555定时器是一种应用极为广泛的多功能集成电路。文章详细研究了555定时器的工作原理之后,分别搭建了触摸定时开关电路和循环闪烁灯电路。一方面对理论过程进行了严密的论证,确保电路能正常工作;另一方面用元器件搭建了实物电路,并成功实现了电路的逻辑功能。上述的两种电路都有很好的市场前景。     

555定时器的应用研究

555定时器是一种应用极为广泛的多功能集成电路。文章详细研究了555定时器的工作原理之后,分别搭建了触摸定时开关电路和循环闪烁灯电路。一方面对理论过程进行了严密的论证,确保电路能正常工作;另一方面用元器件搭建了实物电路,并成功实现了电路的逻辑功能。上述的两种电路都有很好的市场前景。     

基本RS触发器电路分析教学探讨

通过采用分析时序电路的方法来分析基本RS触发器。这种方法是根据逻辑图求状态方程,再根据状态方程来分析电路的特性。采用这种基本RS触发器电路分析的方法,学生更易于接受,也能更快更好地掌握基本RS触发器的逻辑功能。     

555定时器应用电路在Protel99中的仿真

Protel 99具有优越的混合信号电路仿真功能。本文以555定时器构成的自激振荡器、单稳态触发器、施密特触发器电路仿真为例,介绍了在仿真过程中应注意的若干事项,给出了对应的仿真波形,采取这样的教学方法更形象、灵活,将收到事半功倍的教学效果。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.