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NE5532设计拾音器电路

Other Parts Discussed in Thread: NE5532

NE5532设计的拾音器电路如下图所示,包含了2级放大电路,每级增益10倍,共放大100倍。同时加有高通和低通滤波,高通滤波为50Hz,低通滤波为20kHz。

供电电压为正负5V,符合芯片手册中的要求,但输出为80Hz的方波 ,幅度约为4.2V。

我想应该是电路的问题,是产生了自激振荡?最大的疑问是,在进行高通滤波或低通滤波时,能否同时放大信号呢?

(提示:GND-SD接地端口,实际为-5V电源)