声控报警器 毕业设计.doc

毕业设计（论文）报告 题 目 声控报警器 系 别 电子工程系 专 业 应用电子技术∕应用英语 班 级 0502 学生姓名 金超 学 号 000050424 指导教师 蔡锦元 刘磊 声控报警器 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。本课程设计利用压电陶瓷片作为声传感器获得，经放大后触发由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，实现课要求。关键字：；NE555；单稳态触发器；多谐振荡器  Voice-activated alarm Abstract ： Today people pay more and more attention on anti-theft system. But the alarm on the market most of are used in some large financial institutions. The high price of general is difficult to accept. If we can design and manufacture a kind of cheap and reliable performance of sensitive anti-theft alarm, that will guarantee the security and property security to play a more effective role. This course introduces the simple voice-activated alarm circuit design and circuit board production. Based on this circuit only shows the replacement of the corresponding components of the alarm can be converted into different types of alarms, such as infrared detectors, and the infrared detectors sound first. This circuit mainly by the voice amplifier circuit, monostable multivibrator circuit, alarm circuit, the design of the use of piezoelectric ceramics as a sound sensor and the signal was converted to voltage signals, amplified by the FET integrated triggered by NE555 chip consisting of monostable multivibrator and multi-harmonic oscillator, buzzer driver output voltage work. After commissioning, it’s founcation will mach the course’s requirements. Key words: C9013;NE555;One-shot;Astable Multivibrator 目录 前言…………………………………………………………5第1章 设计任务要求……………………………………6 第2章 系统框图…………………………………………………………… 电路工作原理……………………………………  3.1原理图…………………………………………………………………8  3.2声音采集放大………………………………………………………… 3.2.1传感器的介绍……………………………………………………9 3.2.2场效应管放大电路……………………………………………12 3.3时钟信号产生电路…………………………………………………16 3.3.1 NE555…………………