本文件包含三份文档，分别是完整的运算放大器使用指南，运算放大器典型电路（上）和运算放大器典型电路（下）。对于运放的学习和应用非常有帮助。-This document contains three documents, namely the complete user guide for operational amplifiers, operational amplifiers typical circuit (top) and a typical op-amp circuit (the next). For the study and application of the op amp is very helpful.