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摘要
电子琴是现代电子科技与音乐结合的产物，是一种新型的键盘乐器，它在音奏中已
成为不可缺少的一部分。本文主要介绍运用555定时器制作简易电子琴的设计方法
。该方法利用555定时器构成多谐振荡器，通过按键控制不同的RC组合应用多谐振
荡器产生不同频率八个基本音阶的脉冲信号波，然后连到扬声器上，即可发出八音
阶的音乐。在该设计中，利用了555定时器构成的多谐振荡器产生各音阶不同频率
的脉冲，不仅仅使其频率调节更加方便，而且发出的声音稳定、饱 。
关键词 ：简易电子琴，555定时器，多谐振荡器，八个基本音阶
目录
前言·······························································1
第一章 设计内容及要求··········································2
1.1 设计的基本原理··············································2
1.2 设计要求···················································2
第二章 系统组成及工作原理·····································3
2.1 系统组成···················································3
2.1.1 按键模块··················································3
2.1.2音调发生模块··············································3
2.1.3音响模块··················································4
2.2 工作原理···················································4
2.2.1 NE555 多谐振荡器··········································5
2.2.2 LM386集成功率放大器······································7
第三章 方案比较·················································8
3.1 方案一······················································8
3.2 方案二······················································9
3.3方案三·····················································10
3.4方案分析与比较·············································11
第四章 参数计算、器件选择····································12
4.1 参数计算···················································12
4.2 器件选择···················································12
第五章 系统调试及测试结果分析······························14
5.1 系统调试···················································18
5.2 硬件调试···················································19 2
5.3 测试结果与分析·············································19
5.4 误差分析···················································19
实验小结及心得体会················································20
结论······························································21
参考文献···································
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