语音放大器电路设计

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1、-21-摘要设计一个对弱的语音信号具有放大能力的放大器电路，其规格如下：1）输入信号源为话筒舒服，幅度大小为0~5mV.2）最大输出公里为8W。3）负载阻抗为8Ω4）频带宽度BW=80~6000Hz。5）非线性失真系≤3%（在BW内满功率下）。6）设计具有音调控制功能。在1KHz为0dB；在100HZHE10kHz处又±12dB的调节范围。通过多级放大的方法进行设计和对各级的放大倍数调整，从而得到一个可以消除噪声影响的语音放大系统，要求效率高，对原声的失真程度小，输出的功率大。语音放大器可以把一些弱小的声音信号进行放大，达

2、到能够清晰辨认其内容。目录一、语音放大器的方案设计···················4二、单元电路的设计·····························52.1——前置放大级的···································52.2——音调控制器设计设计·····································62.2.1——低频工作时原件参数计算···························72.2.1.1——低频提升·················

3、······················92.2.1.2——低频衰减·······································102.2.2——高频工作时的原件计算·····························112.2.2.1——高频提升·······································132.2.2.2——高频衰减·······································142.3——21-21-摘要设计一个对弱的语音信号具有放大能力的

4、放大器电路，其规格如下：1）输入信号源为话筒舒服，幅度大小为0~5mV.2）最大输出公里为8W。3）负载阻抗为8Ω4）频带宽度BW=80~6000Hz。5）非线性失真系≤3%（在BW内满功率下）。6）设计具有音调控制功能。在1KHz为0dB；在100HZHE10kHz处又±12dB的调节范围。通过多级放大的方法进行设计和对各级的放大倍数调整，从而得到一个可以消除噪声影响的语音放大系统，要求效率高，对原声的失真程度小，输出的功率大。语音放大器可以把一些弱小的声音信号进行放大，达到能够清晰辨认其内容。目录一、语音放大器的方案设

5、计···················4二、单元电路的设计·····························52.1——前置放大级的···································52.2——音调控制器设计设计·····································62.2.1——低频工作时原件参数计算···························72.2.1.1——低频提升·······································92

6、.2.1.2——低频衰减·······································102.2.2——高频工作时的原件计算·····························112.2.2.1——高频提升·······································132.2.2.2——高频衰减·······································142.3——21-21-功率输出级的设计···································1

7、42.3.1—确定电源电压·······································162.3.2——功率输出级的设计·································162.3.2.1——输出晶体管的选择·······························162.3.2.2——复合管的选择···································172.3.2.3——电阻`R12的估算·····························172.3.2.4——

8、确定偏置电路···································172.3.2.5——反馈电阻的决定························18三、语音放大器设计电路的总电路图·······19四、设计结论····································