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LM3886 FFT 看起来是过零失真吗?

Other Parts Discussed in Thread: LM3886

LM3886 并联的电路 电源电压正负35V  负载8欧姆电阻

伴随频率 绵绵不绝的谐波 这个是过零失真吗?

3886 FFT:

other:

3886 SCH:

3886 PCB top:

3886 PCB bottom: