制作一个测量用ＭＩＣ

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小钳子

测量用的话筒是松下的WM-61A
这是个驻极体话筒.是我在音响DIY论坛组织团购时买的,在此对XDW老兄表示感谢.
话筒的资料:
WM-61A
电路图
电路图的原型是网上流传的一个电路,比较简单实用.

实际制作中,我做了一点修改,运放根本用不着采用TL074这样的4运放,双运放就可以了.我采用了万用表中常用的微功耗双运放TL062,配合9V的叠层电池正好.稳压电源部分的采用3个二极管串联的参考电压用TL431接成2.5V的电压源.下图是实际运用的电路图,各工作点已经用红色笔标上

话筒的连接
话筒与话放的连接有好几种方法,我选用了下图中的A方法

电路板
为了把这个话筒放大器装到我的用有线电视分配器改装的机壳中,特制作了一块电路板,由于机壳内部空间狭小,设计电路板时尝试采用贴片元件.


这是最后制作完成以后的电路板.电路基本免调试,可以根据自己的需要和话筒的实际灵敏度更改放大倍数.


测试时
把输出端接到示波器上,自己对着话筒吹口哨,呵呵,吹出来的是正弦波哦.
为了便于大家查找,

yppyppypp

[em11][em11]

小钳子

三十米深蓝