方波发生器制作.pdf

目 录 第一章 方波发生器制作 1.1 设计任务······················································2 1.2 设计方案·····················································2 1.3 系统分析与设计················································2 1.4 电路图、元器件清单、仪器仪表清单·····························3 1.5 系统安装、调试与参数测量······································4 1.6 实验体会···················································4 第二章 不规则变速循环彩灯的制作 2.1 设计任务······················································5 2.2 总设计方案···················································5 2.3 系统设计与分析···············································5 2.4 电路图、元器件清单、仪器仪表清单·····························6 2.5 系统安装、调试与参数测量·····································7 2.6 实验体会·····················································8 第三章 声控延时灯的制作与调试 3.1 设计任务·····················································9 3.2 总设计方案···················································9 3.3 系统分析与设计···············································9 3.4 电路图、元器件清单、仪器仪表清单····························10 3.5 系统安装、调试与参数测量·····································11 3.6 实验体会·····················································11 参考文献··························································12 1 第1章 方波发生器制作 1.1 设计任务 设计一个简易的方波发生器。在给定合适电源状态下利用相关器件制作一 电路使该电路能输出一定频率的方波。当输出端接示波器，可观察并计算出所 产生的方波波形及频率。 1.2 设计方案 根据相关资料查找，可以运用74LS00及电容电阻设计一个方波发生电路。 电路工作原理为：74LS00为“四2输入与非门”，内部有四个两输入与非门。A、 B为输入端，Y为输出端，其共用电源端为V （14脚）接地端为GND （7脚）。 CC 当给5脚输入高电平，空脚 4 输入低电平，经过 74LS00输出高电平，对电容 C1进行充电，示波器上显示信号在Y轴正半部分。电容C1充电结束后，C1继 续放电，当放电结束后，C1处相当于断开。2脚接地，输出低电平。空脚 1输 入高电平，经过74LS00输出高电平，对电容C2进行充电，此时4脚输入高电 平。空脚 5 也输入高电平，经 74LS00 后输出低电平，在示波器显示信号为 Y 轴负半部分。C2充电结束后断开，重复第一过程。从此反复产生稳定方波。 1.3系统分析与设计 图1-1.引脚图 图1-2.内部原理示意图