电子琴模电课设.doc

课程设计任务书

学生姓名：专业班级：

指导教师：工作单位：信息工程学院

题目:简易电子琴设计

初始条件：

可选元件：集成运算放大器LM324、电阻、电位器、电容假设干，直流电源Vcc=+12V，或自备元器件。

可用仪器：示波器，万用表，直流稳压源，函数发生器

要求完成的主要任务:

〔1〕设计任务

根据条件，完成对简易电子琴电路的设计、装配与调试。

〔2〕设计要求

①设计一简易电子琴电路，按下不同琴键即改变RC值，能发出C调的八个根本音阶，采用运算放大器构成振荡电路，用集成功放电路输出。八个根本音阶在C调时所对应的频率如下表所列

C调

1

2

3

4

5

6

7

i

f0/HZ

264

297

330

352

396

440

495

528

=2\*GB3②选择电路方案，完成对确定方案电路的设计。计算电路元件参数与元件选择、并画出总体电路原理图，阐述根本原理。〔选做：用PSPICE或EWB软件完成仿真〕

=3\*GB3③安装调试并按规定格式写出课程设计报告书。

时间安排：

1、2015年1月12日分班集中，布置课程设计任务、选题；讲解课设具体实施方案与课程设计报告格式的要求；课设答疑事项。

2、2015年1月13日至2015年1月15日完成资料查阅、设计、制作与调试；完成课程设计报告撰写。

3、2015年1月16日提交课程设计报告，进行课程设计验收和辩论。

指导教师签名：年月日

系主任〔或责任教师〕签名：年月日

目录

摘要···································································4

1.设计任务····························································5

1.1要求······························································5

1.2思想构图··························································5

1.2.1模块功能·····················································5

1.2.2主要元件选择·················································5

2.系统组成和工作原理················································6

2.1NE555简介·······················································6

2.1.1概述·························································6

2.1.2逻辑符号和管脚排列···········································8

2.1.3内部原理图···················································8

2.1.4逻辑功能·····················································9

2.2LM386简介·······················································10

2.2.1外形、管脚及内部电路·········································10

2.2.2性能指标·····················································11

2.3简易电子琴的系统组成·············································11

2.3.1按键模块·····················································11

2.3.2音阶发生模块·················································11

2.3.3音量放大模块·················································12

2.4简易电子琴的总体工作原理···································