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这里介绍一种供电电源(如附图所示),可把220V(或110V)电压,转换成12V电压。并且,不需要使用变压器。电阻R_1是降压电阻,串联电阻分压后的交流电,由两只二极管组成的整流电路整流、限幅至12V,然后通过电解电容C_2、C_3的滤波,得到直流电压输出。为使滤波效果更好,可增大C_2、C_3的电容值。本电路设计了一个作供电电源指示器的发光二极管,用以保证选择适用于供电电源的,具有合适的额定值的电容C_1。
Here to introduce a power supply (as shown), 220V (or 110V) voltage, converted to 12V voltage. And, do not need to use transformers. The resistor R_1 is a step-down resistor. After the series resistor divides the AC voltage, a rectifier circuit composed of two diodes rectifies and limits the voltage to 12V, and then the DC voltage output is obtained through the filtering of the electrolytic capacitors C_2 and C_3. In order to make the filtering effect better, the capacitance of C_2 and C_3 can be increased. This circuit is designed as a light-emitting diode for power supply indicator, to ensure that the selection for the power supply, with the appropriate rating of the capacitor C_1.