1.接地点与交流声——部件配置要领以低频放大器为例来说明。特别在要求低噪声的前置放大电路中,如果部件配置和接线方法不当,容易产生交流声。要降低电源交流声,必须注意将前置放大器印刷板离开电源变压器安装,并注意平滑滤波电路的设计。在前置放大电路中,接线方面需特别注意的地方在于输入端的接线和接地点的取法。 1. Grounding point and hum - component configuration essentials to low-frequency amplifier as an example to illustrate. Especially in pre-amp circuits that require low noise, humming can easily occur if the part configuration and wiring methods are not suitable. To reduce the hum of the power supply, care must be taken to remove the preamplifier board from the power transformer and note the design of the smoothing filter circuit. In the preamplifier circuit, the wiring should pay special attention to the wiring and grounding point of the input method.