苏州经贸职业技术学院毕业论文扩音机实验实训电路设计目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc266478637"摘要PAGEREF_Toc266478637\h2HYPERLINK\l"_Toc266478638"引言：PAGEREF_Toc266478638\h2HYPERLINK\l"_Toc266478639"1扩音机电路总体设计PAGEREF_Toc266478639\h3HYPERLINK\l"_Toc266478640"2扩音机电压放大的设计PAGEREF_Toc266478640\h3HYPERLINK\l"_Toc266478641"2.1电压放大的比较和选择PAGEREF_Toc266478641\h3HYPERLINK\l"_Toc266478642"2.2运放的选择PAGEREF_Toc266478642\h4HYPERLINK\l"_Toc266478643"2.3放大电路设计PAGEREF_Toc266478643\h4HYPERLINK\l"_Toc266478644"2.3.1放大级PAGEREF_Toc266478644\h5HYPERLINK\l"_Toc266478645"2.3.2音调控制电路PAGEREF_Toc266478645\h5HYPERLINK\l"_Toc266478646"3扩音机功率放大的设计PAGEREF_Toc266478646\h6HYPERLINK\l"_Toc266478647"3.1功放的选择PAGEREF_Toc266478647\h6HYPERLINK\l"_Toc266478648"3.2电路设计PAGEREF_Toc266478648\h6HYPERLINK\l"_Toc266478649"3.2.1LM386集成功放的介绍PAGEREF_Toc266478649\h6HYPERLINK\l"_Toc266478650"3.2.2功放电路设计PAGEREF_Toc266478650\h7HYPERLINK\l"_Toc266478651"4扩音机的电路制作PAGEREF_Toc266478651\h8HYPERLINK\l"_Toc266478652"4.1扩音机原理图的绘制PAGEREF_Toc266478652\h8HYPERLINK\l"_Toc266478653"4.2扩音机印制板电路板的绘制PAGEREF_Toc266478653\h8HYPERLINK\l"_Toc266478654"5扩音机硬件实物的制作与调试PAGEREF_Toc266478654\h9HYPERLINK\l"_Toc266478655"5.1扩音机硬件实物的制作PAGEREF_Toc266478655\h9HYPERLINK\l"_Toc266478656"5.2扩音机硬件实物的调试与检修PAGEREF_Toc266478656\h10HYPERLINK\l"_Toc266478657"6小结PAGEREF_Toc266478657\h11HYPERLINK\l"_Toc266478658"7谢辞PAGEREF_Toc266478658\h11HYPERLINK\l"_Toc266478659"8参考文献PAGEREF_Toc266478659\h11HYPERLINK\l"_Toc266478660"9附录PAGEREF_Toc266478660\h12扩音机实验实训电路设计摘要：扩音机的作用就是将来自信号源的微弱电信号进行放大，产生足够大的电流以驱动扬声器发出声音。本设计采用集成运算放大器LM741两级电压放大，还有以集成功率放大器LM386连成的输出级。Abstract:Themegaphoneeffectistheweaksignalfromsourceamplification,generateenoughelectricitytodrivethespeakersound.ThisdesignUSEStheintegratedoperationalamplifierLM741two-stagevoltageamplifier,andintegratedamplifieroutputlevelofLM386toge