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在仪器系统和电路的设计中,经常要应用陷波器来抑制电网频率的哼声。如果陷波器的抑制频率能够调整的话,也就是说可以调整到电网频率。那么组成陷波器的元、器件就不必很精确,容许有较大的公差范围,这样就避免了麻烦的元、器件挑选工作。本文将要介绍一种在音频系统和仪器系统中经常应用的陷波器,它抑制不希望的50赫干扰信号。陷波器的电路图示于下图。
In the design of instrumentation systems and circuits, it is often necessary to apply a notch filter to suppress the hum of the grid frequency. If the notch filter suppression frequency can be adjusted, that is to say can be adjusted to the grid frequency. The elements that make up the trap, therefore, do not have to be precise enough to allow for a wide range of tolerances, thus eliminating the need for cumbersome elemental and device selection. This article will introduce a notch filter commonly used in audio systems and instrumentation systems that suppresses unwanted 50 Hz interference. The circuit diagram of the trap is shown in the following figure.