描述
762CNA-AT
元件符号表示实际电路中的元件，它的形状与实际的元件不一定相似，甚至完全不一样。但是它一般都表示出了元件的特点，而且引脚的数目都和实际元件保持一致。
连线表示的是实际电路中的导线，在原理图中虽然是一根线，但在常用的印刷电路板中往往不是线而是各种形状的铜箔块，就像收音机原理图中的许多连线在印刷电路板图中并不一定都是线形的，也可以是一定形状的铜膜。
结点表示几个元件引脚或几条导线之间相互的连接关系。所有和结点相连的元件引脚、导线，不论数目多少，都是导通的。
注释在电路图中是十分重要的，电路图中所有的文字都可以归入注释—类。细看以上各图就会发现，在电路图的各个地方都有注释存在，它们被用来说明元件的型号、名称等等。
若不知电路的作用，可先分析电路的输入和输出信号之间的关系。如信号变化规律及它们之间的关系、相位问题是同相位，或反相位。电路和组成形式，是放大电路，振荡电路，脉冲电路，还是解调电路。电器修理、电路设计的工作人员都是要通过分析电路原理图，了解电器的功能和工作原理，才能得心应手开展工作的。作为从事此项工作的技术人员，首先要有过硬的基本功，要能对有技术参数的电路原理图进行总体了解，能进行划分功能模块，找出信号流向，确定元件作用。要学会维修电器设备和设计电路，就必须熟练掌握各单元电路的原理。会划分功能块，能按照不同的功能把整机电路的元件进行分组，让每个功能块形成一个具体功能的元件组合，如基本放大电路，开关电路，波形变换电路等。
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