欢迎来到天天文库
浏览记录
ID:41010153
大小:1.67 MB
页数:17页
时间:2019-08-13
《简易电子琴(NE555,LM386)》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、实用文案课程设计说明书课程设计名称:模拟电路课程设计课程设计题目:简易电子琴文案大全实用文案模拟电路课程设计任务书题目简易电子琴内容及要求①产生e调8个音阶的振荡频率,分别由1、2、3、4、5、6、7、0号数字键控制;②其频率分别为:1:261.6、2:293.6、3:329.6、4:349.2、5:392.0、6:440.0、7:439.9、0:523;③利用集成功放放大该信号,驱动扬声器;④设计一声调调节电路,改变生成声音的频率。进度安排第7周:查阅资料,学习仿真软件,确定方案,完成原理图设计及仿真;第8周:领元器件、仪器设备,制作、焊接、调试电路,完成系统的设计;第9周
2、:检查设计结果、撰写课设报告。文案大全实用文案摘要音乐在人类社会扮演着重要的角色,传统的乐器学习难度大且价格高昂,而一些简易的电子乐器价格相对便宜,能满足一般爱好者需求。故研制电子乐器具有一定社会意义。本次课程设计中,采用NE555和LM386功率放大器来完成设计要求。利用555定时器构成多谐振荡器,通过8个按键控制不同的RC组合使其产生不同频率八个基本音阶的脉冲信号波,通过LM386功率放大器驱动扬声器,即可发出八个音阶的音乐。关键词:简易电子琴、NE555、LM386、8个音阶文案大全实用文案目录第一章系统组成·······························
3、················11.1系统框图················································11.2系统介绍················································1第二章各模块设计·············································22.1按键开关模块············································22.2振荡器模块··············································
4、22.3扬声器模块··············································3第三章 仿真图及分析···········································43.1仿真波形图······················································4文案大全实用文案3.2仿真结果分析·····················································7第四章设计结果分析·····································
5、······8第五章实验小结···············································9参考文献·····················································10附录A元件清单··············································11附录B焊接实物图·············································12文案大全实用文案第一章系统组成1.1系统框图按键开关 音响模块振荡器模块图1.1系统框图采用555集成定时器组成简易电子
6、琴,整个电路由振荡器、LM386功放器、扬声器和按键开关等部分组成。主振荡器是由555定时器,八个按键开关,外接电容C1、C2,外接电阻R8以及R1-R7(用8个可调电阻调成所需电阻元件)等元件组成。1.2系统介绍直流信号经振荡器模块后转变成频率不同的矩形波信号,通过一个4.7uF耦合电容滤除直流分量后,再接LM386放大驱动扬声器发声。按原理图接线后分别按下不同按键即可令喇叭发出不同频率的声音,从而模拟出电子琴的工作。文案大全实用文案第二章各模块设计2.1按键开关模块图2.1按键开关模块按键开关模块兼顾电源开关和改变振荡器RC组合中的电阻的作用。即按下不同的开关都将接通电源
7、,同时接入不同的电阻阻值使振荡器模块产生频率不同的信号。2.2振荡器模块设计由555定时器组成的多谐振荡器及其工作波形如图2.1.1所示,其中R1、R2和电容C为外接元件。图2.2555工作图其实质是将输入的直流信号转换成矩形波信号输出。充电时间放电时间矩形波的振荡周期T=+≈0.7(R1+2R2)C文案大全实用文案因此改变、和电容C的值,便可改变矩形波的周期和频率。图2.3振荡器模块图2.1.2所示是整个电路设计的关键, 由一个555芯片和几个电容以及电阻组成多谐振荡器,经过可调电阻输出设计所需对应的
此文档下载收益归作者所有