光控电路........................................................................................118

平衡亮度传感电路............................................................................119

平衡光线传感电路元件列表　...............................................................................120

平衡传感对管　.................................................................................................120

光敏电阻的配对　..............................................................................................120

阻抗平衡电位器　..............................................................................................121

限流电阻　........................................................................................................121

测试点　...........................................................................................................122

用分压器实现电阻和电压的转换　.........................................................................124

搭建亮度传感平衡电路　.....................................................................................125

亮度传感电路的平衡调整　..................................................................................125

第　15 章 比较器............................................................126

电压比较器.....................................................................................126

认识　LM393 ..................................................................................................126

比较器的购买　.................................................................................................129

亮度比较电路..................................................................................129

电路图和接线图的对比　.....................................................................................129

元件编号　........................................................................................................130

绘制连线和交叉线　...........................................................................................130

认识亮度比较电路　...........................................................................................131

亮度比较电路的元件列表　..................................................................................131

搭建亮度比较电路　...........................................................................................131

增加光源........................................................................................134

认识双　LED 光源电路 ......................................................................................134

搭建光源电路　.................................................................................................135

再次使用多个　LED ..........................................................................................136

欣赏简约之美..................................................................................137

第　16 章 晶体管开关.......................................................　138

负电源的定义..................................................................................138

认识　2907 晶体管 ...........................................................................................139

用万用表测试双极型晶体管.................................................................140

使用万用表的晶体管测试功能　............................................................................140

使用万用表的二极管测试档　...............................................................................142

双极型晶体管测试电路.......................................................................　143

PNP　型晶体管的测试电路图 .............................................................................143

搭建　PNP 型晶体管测试电路 ............................................................................145

NPN　型晶体管的测试电路图 .............................................................................146

搭建　NPN 型晶体管测试电路 ............................................................................147

带有晶体管的亮度比较电路.................................................................147

计算晶体管的电流　...........................................................................................147

搭建带有晶体管的亮度比较电路　.........................................................................149

PNP　型和 NPN 型晶体管的总结..........................................................150

直流电机的工作原理.........................................................................151

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