收音机电工实习报告.doc

《收音机电工实习报告.doc》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、电子工艺实习报告院系：机械工程学院班级：14级机械设计制造及其自动化5班姓名：胡铭松学号：20144110153312目录一、实习时间·······························································3二、实习地点·······························································3三、实习目的······················································

2、·········3四、实验原理·······························································3五、实验器材·······························································51、12实验所需工具····························································51、制作收音机所需材料·····························

3、·························6六、实习项目和时间安排·····················································8七、实习内容·······························································91、焊接练习，掌握烙铁的使用方法············································92、尝试匹配元件到收音机电烙板························

4、······················93、按照工位图焊接元器件····················································94、调试电器12································································91、组装····································································92、测试·······················

5、·············································9八、实习心得·······························································10一、实习时间：2016年03月28号-2016年04月1号二、实习地点：8A104三、实习目的：1、熟悉手工焊锡的常用工具使用、维护和维修；2、基本掌握手工电烙铁的焊接技术，能够独立完成简单电子产品的安装和焊接；3、熟悉电子产品的安装工艺和生产流程；4、了解电子器件的类别、型号、规格、性

6、能及使用方法，能查阅有关电子器件图书，能根据电路原理图组装实物；125、了解电子产品的焊接，调试与维修方法，通过收音机的通电检测调试了解一般电子产品的生产调试过程，初步学习调试电子产品的方法，培养检测能力与一丝不苟的科学作风。四、实验原理常见的收音机电路可分为：直放式和超外差式。所谓直放式就是在收音机电路中，将选中的电台信号直接放大后送去检波，功放的方式。所谓超外差式，就是收音机将选中的高频电台信号，变换成一个中频信号，然后放大、检波、功放的方式。由于超外差式可大大提高收音机的灵敏度和选择性，所以目前的收音机都普遍采

7、用超外差接收方式。收音机按无线电波的发射接收方法可分为AM调幅收音和FM调频收音两种收音机。收音机的调幅方式是指无线电高频载波的幅度收音频信号大小变化的调制方式；调频方式是指无线电高频电波的频率随音频变化大小而变化的调制方式。电视的伴音（TVSOUND）使用的调频制式，传播方式与调频广播一样，也是近距离传播。电视伴音分为VHF和UHF，其中VHF：1-12频道（又分为VHF-L1-5和VHF-H6-12）UHF:13-56频道。电视伴音收音机能收到的电视节目伴音都是本地无线发射的信号；如果将收音机放在有线电视的闭路线

8、边，也可以收到部分在线频段范围内的伴音信号。首先，通过天线接收，然后再经下面一系列转变电路后转变为扬声器播出的声音。12（一）调谐、变频电器（二）中频放大电路（三）检测波及自动增益控制电器（四）低频前置放大及功率放大电器德生R-202T收音机工作原理五、实验器材1、实验所需工具电烙铁、螺丝刀、剪钳、松香、调试仪器、锡条、12序号材料规格型号规格