It also gives a safety design problem analysis using an electret capacitor microphone to pick-up the heart sound signals.
该电路涉及到放大、滤波、电平抬升等电路，并给出了安全设计问题，利用驻极体电容传声器来拾取心音信号。
Capacitor or push-pull microphone can be specified.
可指定电容器式或推拉式扩音器。
Standard microphone. Capacitor or push-pull microphone can be specified.
标准扩音器。可指定电容器式或推拉式扩音器。
Standard microphone. Capacitor or push-pull microphone can be specified.
标准扩音器。可指定电容器式或推拉式扩音器。
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