电容储能式记忆门铃.ewb

EWB经典实用列子

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"自39班  高新成   7号" 
"       这是一个 “低电压工作的功率放大器”的设计。  " 
"             全电路的构成" 
"          电源电压以3v为基准，最低工作电压在1.5v以下。" 
"          Tr1,Tr2是为了获得偏置电压，而把晶体管连接成为二极管使用的。这样所形成的电压与输出直流电位相等。" 
"          Tr3,Tr4为输入级的差分放大器电路，由 NPN晶体管组成。Tr5,Tr6为第二级差分放大电路，采用PNP管构成。" 
"      采用PNP管的原因在于，当电源电压变化时，应使工作电压保持不变。如果第二级也采用NPN管，则必须将与" 
"      R7 相当的部分更换成为恒流电路。" 
"          关于Tr7~Tr10，当无信号时，Tr7 和Tr9 ，Tr8 和Tr10 为配对电流密勒；当有信号时，相对于Tr7,Tr8的电流，" 
"      Tr9 ，Tr190 的电流将呈现指数形式变化规律，所以电路由A 类变为B 类。" 
"      Tr11，Tr12 为电流密勒，是为了获得上端振幅。" 
"" 
"" 

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