555定时报警器.ewb

EWB经典实用列子

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"                                                                                                                           555定时报警器" 
"                                                                                                                                   卢琦" 
"                                                                                                                         1999年12月23日" 
"              本电路为定时器，可广泛应用于日常生活之中，如水位定时报警，延迟式小儿尿湿报警，电子定时闹钟等。它有调节范围大，准确性高，原理简单等特点。下面为其线路，技术指标，使用方法，仿真方案。" 
"               技术指标：直流电压源 ：  12V ，     功率 ：1.5W         " 
"                                     控制范围：0——22 s ,         控制精度：0.5s" 
"               要求： 体积小，准确性强，调节方便。 " 
"               简单原理：本电路主要由两个555定时器，RC充电网络，扬声器等组成。其中第一个555定时器连成单稳态触发器，第二个555定时器连成多谐振荡器。当开关S1闭合时，C1被短路，第一个人555定时器的2#输入端电位为0，使电路不工作，而当开关S1断开后，R1和C1网络充电，使第一个555定时器2#输入端变为高电位，使下级电路振荡工作" 
"而发出声响。" 
"                                定时时间：Td=R1*C1*lnVcc/(Vcc-T+).    其中：T+=8V为555定时器的上限电压，Vcc=12V为电源电压。" 
"               仿真方案：先闭合电源开关S2，再断开S2的同时，观察仿真时间，经一定时间后，就会发出报警声，而闭合S1，响声立即消失。不断调节R1，改变充电时间，就可得到" 
"所需的定时时间，并记录R1=0和2M时的时间为Tmin=0,Tmax=22s." 
"                使用方法：在实际制作中，如果想要更大的定时时间，还可以适当增大C1和R1的调节范围。" 
"               " 
"               " 

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