工科论文 ：电信毕业论文——超外差中波调幅收音机组装及调试[1]

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摘 要 电子设计自动化技术已渗透到电子系统和专用集成电路设计的各个环节，个中软件应用到电子设计，使电路的设计，调整和改进更加高效便捷。简单分析了超外差式调幅收音机电路的工作原理及其组装和调试。现在的S66E将原来的插座改为立体声耳机插座，电路原理图未变，步线有所调整。更改后的收音机灵敏度更高、声音更洪亮、用途更广泛，适合MP3、单放机等机型所使用的耳机。散件为3V 低压金硅管六管超外差式收音机，具有安装调试方便、工作稳定、生硬洪亮、耗电省等优点。它由输入回路高放混频级、一级中放、二级中放、前置低放兼检波级、低放级和公放级等部分组成，接受频率范围为535KHZ~1605KHZ的中波段。

关键词：高放混频级低放兼检波级 低压金硅管

Abstract

Electronic design automation technology has infiltrated into electronic systems and application-specific integrated circuit design in all aspects, in a software application to the electronic design and simulation, circuit design, adjust and improve more efficient convenient. A simple analysis of the superheterodyne AM radio circuit and the principle of assembly and debugging. Now the S66E the original stereo headphone socket to socket, circuit schematics unchanged, infantry line adjustments. After the change of radio sensitivity higher, sound more resonant, more extensive use for MP3, player models, such as by using headphones. Parts of 3 V low-voltage of the silicon six superheterodyne radio, with the installation debugging convenience, the stability, rigidity, whose advantages in power consumption. It is the importation of high-level radioactive mixer circuit level, in a release, the two-in, pre-release of the detection of low-level, low-level and on the high-level and other components, to accept the frequency range of 535 KHZ ~ 1605KHZ in the band .

Key Words: Mixing high-level And low-level detection Low-voltage of the silicon

目 录

1 前 言. 1

2 课设内容. 2

2.1 收音机及超外差收音机的电路原理. 2

2.2 元器件说明. 4

2.3 收音机的焊接和组装. 6

2.4 调试及故障排除. 7

3 收音机的设计、安装与调试. 11

3.1 音频信号的发送与接收. 11

3.1.1 三种调制方式. 11

3.1.2 高频电磁波的传播规律. 11

3.2 两种形式的收音机. 12

3.3 分立元件超外差式收音机电路与分析. 13

3.4 中频放大级（2～3级）. 16

3.5 检波与AGC电路. 18

3.6 前置低放与功率放大电路. 19

4 集成电路超外差式收音机电路与分析. 20

4.1 集成电路芯片与内部功能框图. 20

4.2 集成电路超外差式收音机原理电路与分析. 2工学论文