毕业论文作者学号系部电子信息工程专业电子信息工程题目作用于高保真音响设备的音频放大器指导教师丁文秋评阅教师完成时间：年月日毕业设计(论文)中文摘要题目:作用于高保真音响设备的音频放大器摘要:音频功率放大器简称功放，可以说是各类音响器材中最大的一个家族了。音频功率放大器的的设计是有很多意义的：它可将音源器材输入的较微弱信号进行放大，产生足够大的电流去推动扬声器进行声音的重放。目前音频功率放大由分立元件组成，或集电极输出完成，由分立元件组成的功放，电路结构简单，由集电极输出的功放，可减少信号失真。关键词：功率芯片音频功率放大器毕业设计(论文)外文摘要Title:Roleinhigh-fidelityaudioequipmentaudioamplifierAbstract:PAshortamplifiercanbesaidthatthevarioustypesofaudioequipmentinoneofthebiggestofthefamily.Practicallow-frequencypoweramplifierdesignisalotofsignificance:itcanbeimportedaudioequipmentforaweaksignalamplification,togenerateenoughcurrenttodrivethespeakerstovoiceplayback.Atpresentpoweramplificationbydiscretecomponents,orcompletecollectoroutputfromtheamplifiercomposedofdiscretecomponents,circuitstructureissimple,fromthecollectoroutputamplifiercanreducethesignaldistortion.keywords:powerchipLow-frequencypoweramplifier目录绪论...............................................................................................................................................................3二．放大器的程序设计...............................................................................................................................4（一）电路选型...................................................................4（二）参数计算..................................................................5（三）元器件选择.................................................................5（四）验证定型...................................................................6三．晶体管前置放大器...............................................................................................................................7（一）基本单元电路..............................................................7（二）负反馈放大器...............................................................7（三）直流放大器................................................................9四、功率放大器.........................................................................................................................................12（一）功率放大器设计要点.......................................................12（二）功率放大器的类型..........................................................13（三）音频放大器的设计..........................................................14五、LM1875的简介..................................................................................................................................24（一）LM1875的参数简介..........................................................24（三）LM1875的电路特点..........................................................25六、电路设计.............................................................................................................................................26（一）典型应用电路..............................................................26（三）双电源音频功率放大器PCB图.................................................27七、电路制作与调试.................................................................................................................................
