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CN1为DC-5V电源插座，后面的两个电容在PCB中应该靠近这个插座还是后级的输入？
旁路电容，靠近后级的输入
此外，最好在后级所有用到DC_5V的芯片供电引脚附近也视负载情况加一个104～106的电容。
