翻译论文摘要（不要用软件）

Summary : This text introduces the overview design and method of testing of the power amplifier mainly, and the comparison , calculation and choosing of some basic circuit in the course of designing. And has made a small-scale power amplifier according to the principle putting in work . This work is put and put and compared with the work on the market of simple structure, cheap high, the double signal of bass amplifies the function. This text described some commonly used electronic devices and welding methods at the same time . (enclose the work of making by oneself and put one separately)

Abstract:The general situation, design of this text main introduction power enlarger and test method, and some basic electric circuits in design process of comparison, calculation and choice.The principle that combines to put according to the 功 manufactured a small scaled power enlarger.That 功 puts to put with the 功 on the market to compare the structure simple, the price is cheap and hav