J1202-1学生电源主要供中学生物理分组实验作低压交、直流和直流稳压电源使用。1电源电路的构成与功能如图1所示,交直流部分由降压变压器B1次级抽头分压,通过刷型开关K2调压获得8挡低压交流,由于直流输出要经过整流元件,元件正向压降会使同一挡的直流电压输出低于交流输出,所以 The J1202-1 student power supply is mainly used for middle school students’ physical group experiments for low voltage AC, DC and DC power supplies. 1 The composition and function of the power circuit are shown in Fig. 1. The AC-DC voltage is divided by the secondary tap of the step-down transformer B1, and the 8-bit low-voltage AC voltage is obtained by the voltage regulator K2. Since the DC output passes through the rectifying element, the component is The voltage drop will make the DC voltage output of the same block lower than the AC output, so