通信电路课程设计样本

洛阳理工学院

课程设计报告

课程名称高频电子线路设计题目调频无线话筒专业通信工程班级B100509 学号B10050919 姓名李戈

完成日期 01月12日

调频无线话筒

摘要

调频无线话筒的原理是将声波信号经过麦克风转化为音频电信号, 经过改变结电容来改变高频振荡器的输出频率, 产生调频波, 经过高频放大与选频, 最终由天线发射。由C1耦合到三极管9018的放大电路放大并使c－b结电容变化, 振荡频率变化, 从而实现频率调制。调制后由L1线圈与电容组成的选频回路并经过天线向外发射, 改动L1线圈就可实现变频。使用普通调频收音机在80-108M频率之间, 话筒中心2米范围内能正常接收。该设计具有电压低, 受话灵敏, 制作简易等特点。

关键词:调频, 选频回路, 发射, 结电容, 变频

FM wireless microphone

ABSTRACT

FM wireless microphone is the principle of the acoustic signal through the microphone into electrical audio signal, by changing the capacitance to change the frequency and the output frequency of the oscillator, produces FM wave, through the high frequency amplification and frequency, and ultimately by the transmitting antenna. By C1 coupled to the transistor 9018 amplifying circuit and the C B junction capacitance change, oscillation frequency change, thereby realizing frequency modulation. Modulation by L1 coil and capacitor frequency selective circuit and the antenna emitting, change the L1 coil can achieve frequency conversion. We can use an ordinary FM radio in frequency between 80-108M, microphone center 2 meters range to receive the signal. The design has the advantages of low voltage, receiver sensi tivity, simple manufacture etc…

Key words: frequency, frequency selection circuit, emission, capacitance, frequency conversion

目录

摘要................................. 错误!未定义书签。ABSTRACT .............................. 错误!未定义书签。目录................................ 错误!未定义书签。前言................................ 错误!未定义书签。第1章系统概述....................... 错误!未定义书签。

1.1 设计题目...................... 错误!未定义书签。

1.2 设计目的...................... 错误!未定义书签。

1.3 设计任务...................... 错误!未定义书签。

1.4 设计要求...................... 错误!未定义书签。第2章系统设计原理................... 错误!未定义书签。

2.1 电路结构...................... 错误!未定义书签。

2.2 麦克风和外音输入.............. 错误!未定义书签。

2.3 震荡电路与调制................ 错误!未定义书签。第3章焊接过程....................... 错误!未定义书签。

3.1 排布元器件与焊接.............. 错误!未定义书签。

3.2电路调试....................... 错误!未定义书签。

3.3 故障处理...................... 错误!未定义书签。