Please draw the symbol of a operational amplifier . and state the function of each pin 翻译：请画一个运算放大器的符号，并列出各个引脚的功能。
Here we also call led diode , actually it is the led module which is 2 - pin diode 在这里我们也呼吁领导二极管，它实际上是领导模块是2引脚二极管。
Solder paste is applying for the connection between the mount components foot and pcb pads in the smt assembly 在表面贴装装配的回流焊接中，锡膏用于表面贴装元件的引脚或端子与焊盘之间的连接。
Vertical tube mounting is preferred , but horizontal opration is permissible if pins 2 and 8 are in horizontal plane 垂直管安装是首选，但对于横向的操作是可以容许的，如果引脚2和8个是在水平面。
You should use thermal reliefs on each pin that is connected to a plane , either th or smt , and that regardless of the layer 不管是直插件还是贴片件都应该在连接到电镀面的引脚使用限热槽，不管电镀面在哪个曾上。
Components required to be mounted off the board are provided with lead forms at the board surface or other mechanical support to prevent lifting of solder land 需要离开线路板安装的组件在线路板表面利用引脚形状或其它机械支撑来防止焊盘的翘起。
If you don ' t want a high bandwidth transistor to oscillate place lossy components in at least 2 of the 3 leads . ferrite beads work well 如果你不想通过在高带宽晶体管三个引脚中的至少两个引脚放置损耗元件的方法消除振荡。铁氧体磁珠会起到很好的作用。
The labels " analog ground " and " digital ground " on these pins refer to the parts of the converter to which the pins are connected , and not to the system grounds to which they must go 引脚标记说明该引脚已连接到芯片内部的哪个部分，并非要把该引脚连接到电路的哪个参考点。
Since it is a lead wire type device . it can be attached to printed circuit boards . the relay terminal boards . etc . ; it has a space saving shape ; and it is highly economical 由于采用了引脚结构，电源防雷模块可以直接焊于印刷电路板上、接在继电器等接线端子上，从而节省安装空间，经济适用。
This voltage will be negative if the line is idle and alternate between that negative level and a positive level when data is sent with a magnitude of 5 to 15 volts 译为： “该引脚的电平，如果在总线空闲状态，其电压为负，而在数据发送状态，其电平则在5 15伏的正电平和负电平之间变化。 ” ？
