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麦克风电路板如何加装？

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麦克风电路板如何加装？

浏览：44次 | 提问时间： 08-03 08:13

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3个答案

回幼儿园当学霸 08-03 08:14

整个放大电路所需的*元件的规格如下：电阻R1为1KΩ，电阻R2为1MΩ,电阻R3为1KΩ，三极管VT为   9014，电容C1为4.7μF，电容C2为4.7μF，电池采用一般的五号电池即可，一般正常使用可用半年左右。在制作过程中要注意以下几点：1.三极管的管脚一定要接对，否则起不到放大的作用，管脚区分以下三极管引线朝下，平的一面朝自己，依次是E（发射极），B（基极）和C（集电极）；2.麦克风咪头也是有极性的；3.耦合电容的极性可通过标记来分辨，有箭头且标记为“-”的引脚是负极，正极一般不作标记。由于元件少也可直接搭棚焊接，电路板做好后可直接装进麦克风的底座的内，电路板的电源引线则接入麦克风预留的电池槽里即可。                    希望可以帮到您！

蛊惑人 08-03 08:22

放大电路工作原理      图1是整个话筒放大电路的电路图，从图1中可以看出，整个电路只要六七个原件。下面大概说说工作原理，其中电阻R1负责给咪头提供工作电压，R2与R3负责给三极管提供偏置电压，电容C1负责把咪头的信号耦合给三极管以便放大，最终放大后的信号通过电容C2耦合后送回到话筒线路的正极中，也就时话筒线最外层的屏蔽层（也就是外层的那层铜网）。就是我们制作时要用到的材料或*元件。在制作过程中要注意以下几点：1.三极管的管脚一定要接对，否则起不到放大的作用，管脚区分以下三极管引线朝下，平的一面朝自己，依次是E（发射极），B（基极）和C（集电极）；2.麦克风咪头也是有极性的（具体区分见图4）；3.耦合电容的极性可通过标记来分辨，有箭头且标记为“-”的引脚是负极，正极一般不作标记。      由于元件少也可直接搭棚焊接，电路板做好后可直接装进麦克风的底座的内，电路板的电源引线则接入麦克风预留的电池槽里即可。   三，效果测试      经过试用，麦克风有效距离完全可以达到5—6米，而且用Office   Word2003的语音输入功能，效果也很明显，离话筒1米左右说话也可准确识别。

再见太难 08-03 08:30

给麦克风加无线发射器，给功放加装无线接收器就可以了。

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