简易电子琴叶良.doc

课程设计说明书

课程设计名称：数字逻辑课程设计

课程设计题目：简易电子琴

学院名称：信工学院

专业：计算机科学与技术班级：090452

学号：姓名：叶良

评分：教师：邓谦

2011年6月29日

南昌航空大学

2011年6月28日

摘要

此报告讲述了用555制作简易电子琴，从而产生八种不同音阶控制电路的设计，它能实现在按下8个按键的情况下产生8种不同的音调，并且用LM386将音调放大。

此次参与的电子课程设计以简易电子琴为最终结果，主要是以硬件测试为主，

首先进行电路分析，设计电路图，其次是考虑可能出现的问题。完善电路图，再选择适宜的器件，最后按照电路图设计搭线，调试测试，直到到达理想的结果，当然在这之前要对焊点等要事先查阅资料，了解手工焊接技术，再查阅各个芯片的引脚功能的各个参数，同时还要了解震荡电路，与其产生震荡的原理，在根据振荡电路计算出电阻值，以便选择适宜的电阻值，这些都是课前准备。测试电子琴要一步一步，首先是振荡电路的线路测试，尽量消除噪声，使音质能够清晰，这样电子琴就做成了。

本实验完成了简易电子琴的设计和调试。根本设计思路是采用了模块设计：实现根本要求时只要用555构成多谐振荡电路，通过不同的电阻来获得不同的频率，经由LM386放大从而发出不同的音调。如果要实现提高要求那么需要在根本要求上添加一局部电路即可。通过开关和CD4017控制不同的电阻所对应的振荡电路的通断调节相应频率大小，从而产生不同的音调。

关键字：电子琴，多谐振荡电路，NE555,LM386。

目录

前言································································1

第一章设计内容及要求

1.1设计的根本内容···················································2

1.2设计要求介绍····················································2

第二章系统组成及工作原理

2.1系统组成························································3

2.2工作原理························································3

第三章电路设计方案及参数计算

3.1实验方案·····················································5

3.2实验参数计算·················································5

第四章单元电路设计及主要元件介绍

4.1频率振荡电路···················································7

4.2功率放大电路···················································7

4.3主要元件介绍··················································8

第五章实验调试分析及实验小结

5.1实验调试分析····················································12

5.2实验小结························································12

结论······························································13

附录一····························································14

附录二·····························································15

参考文献···························································