文档介绍：题目感应式防盗报警器
学生姓名
专业班级
学号
所在系电气工程系
指导教师
完成时间 2011年3 月25日
感应式防盗报警器
摘要
在当今社会上防盗系统越来越受到人们的重视。但是市场上的报警器大部分都是用于一些大公司财政机构。价格高昂,一般人们难以接受。如果再设计和生产一种价廉、性能灵敏可靠的防盗报警器,必将在防盗和保证财产安全方面发挥更加有效的作用。本课程主要介绍了简易的感应式声控防盗报警器的电路设计和电路板的制作。以此电路为依据只需更换相应的报警显示元件即可改装成不同类型的报警器,如红外报警器, 红外线声先报警器等。这种电路主要由整流滤波电路、声控放大电路、单稳态触发器电路、报警电路组成,设计利用压电陶瓷片作为声传感器获得信号并将其转换为电压信号,经场效应管放大后触发由NE555集成芯片构成的单稳态触发器和多谐振荡器,输出电压驱动蜂鸣器工作。经过调试,实现课程要求。
关键字:场效应管;NE555;单稳态触发器;多谐振荡器
Inductive and alarm system
ABSTRACT:
In today's society on guard against theft system es more and more attention by people. But the market on the alarm for some mostly pany financial institutions. The price is high, generally it is difficult for people to accept. If again design and production of an inexpensive, sensitive and reliable performance of alarm system, will in the theft and ensure the property security play more effective function. This course mainly introduces the summary of inductive sonic alarm system and the circuit design and circuit board production. This circuit basis only need to change the corresponding alarm display elements can be converted into a different type of alarm, such as infrared alarm, infrared sound first alarm and etc. This circuit consists mainly of rectifier filter circuits, sonic amplifier circuit, single steady-state toggle circuit, alarm posed of piezoelectric element, designs using as acoustic sensor gain signals and convert to voltage signal, the mosfet amplification triggered by NE555 integrated chips constitute the single and multiple harmonic oscillator steady-state flip-flop, output voltage driver buzzer work. missioning, realizing course requirements.
Key word: mosfet, NE555; Single state flip-flop, Many harmonic oscillato
目录
摘要 I
ABSTRACT: II
第1章引言 4
、目的和意义 4
防盗报警器的发展 4
第2章设计任务要求及方案论证选择 6
第3章元器件的介绍和检测 17
传感器的介绍 17
传感器的定义 17
传感器的分类 17
电阻 20
电阻的定义 20
电阻的种类 20
  电阻的标识 22
电阻的检测 22
电容 23
电容的定义 23
电容的检测 2