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在各种电子线踏的设计和制作过程中,有许多场合都要用到正负对称的直流电源。特别是在音响放大电路中为了满足对高保真放大器的要求,一般均取消了以往司空见惯的耦合电容器而采取直接耦合方式。这样如果工作中正负对称电源有一路因故障而无电压,则极有可能烧坏后级器件和扬声器,因而必须极力避免。正负对称直流电源的获得通常如图1,2所示。
In a variety of electronic line design and production process, there are many occasions to use positive and negative symmetrical DC power supply. Especially in the audio amplifier circuit in order to meet the requirements of high-fidelity amplifier, the general have canceled the usual coupling capacitors used in the past to direct coupling. So if the work of positive and negative symmetrical power supply all the way there is no voltage due to fault, it is very likely to burn after-class devices and speakers, and therefore must be avoided. Positive and negative symmetrical DC power supply is usually shown in Figure 1,2.