317是电子爱好者非常熟悉的三端稳压集成电路,它具有输出电压可变、内藏保护功能、体积小、性价比高、工作稳定可靠等特点,颇受广大电子爱好者的青睐。电子爱好者经常用它制作输出电压可变的稳压电源,所采用的电路模式如图1所示,调节可变电阻R2的阻值,便可从317的输出端获得可变的输出电压U_0。从图1的电路中可以看出,317的输出电 317 is a very familiar three-terminal regulator electronics enthusiasts integrated circuit, which has a variable output voltage, built-in protection, small size, cost-effective, stable and reliable, and other characteristics of the majority of electronic enthusiasts favored. Electronic enthusiasts often use it to produce a regulated output voltage variable power supply, the circuit used in the model shown in Figure 1, adjust the resistance of the variable resistor R2, 317 can be obtained from the output variable output voltage U_0 . As can be seen from the circuit of Figure 1, the output of 317