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请问一下这是电源产生的电纹吗?

Other Parts Discussed in Thread: LM2695, LM2596

这是一个经过放大器后出来的信号,放大器并没有信号输入,听说是电源电纹引起的,我这里用的电路是12V的开关电源->LM2695稳压器输出来的5V电源。我想确认一下这种噪声是什么噪声?有没有什么好的过滤办法