Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"                                                                                                                           555定時報警器" 
"                                                                                                                                   盧琦" 
"                                                                                                                         1999年12月23日" 
"              本電路為定時器，可廣泛應用于日常生活之中，如水位定時報警，延遲式小兒尿濕報警，電子定時鬧鐘等。它有調節范圍大，準確性高，原理簡單等特點。下面為其線路，技術指標，使用方法，仿真方案。" 
"               技術指標：直流電壓源 ：  12V ，     功率 ：1.5W         " 
"                                     控制范圍：0——22 s ,         控制精度：0.5s" 
"               要求： 體積小，準確性強，調節方便。 " 
"               簡單原理：本電路主要由兩個555定時器，RC充電網絡，揚聲器等組成。其中第一個555定時器連成單穩態觸發器，第二個555定時器連成多諧振蕩器。當開關S1閉合時，C1被短路，第一個人555定時器的2#輸入端電位為0，使電路不工作，而當開關S1斷開后，R1和C1網絡充電，使第一個555定時器2#輸入端變為高電位，使下級電路振蕩工作" 
"而發出聲響。" 
"                                定時時間：Td=R1*C1*lnVcc/(Vcc-T+).    其中：T+=8V為555定時器的上限電壓，Vcc=12V為電源電壓。" 
"               仿真方案：先閉合電源開關S2，再斷開S2的同時，觀察仿真時間，經一定時間后，就會發出報警聲，而閉合S1，響聲立即消失。不斷調節R1，改變充電時間，就可得到" 
"所需的定時時間，并記錄R1=0和2M時的時間為Tmin=0,Tmax=22s." 
"                使用方法：在實際制作中，如果想要更大的定時時間，還可以適當增大C1和R1的調節范圍。" 
"               " 
"               " 

EncryptionType: 2
UsingVectorGraphics: 0
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