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关于音频放大器TPA3007D1的增益

Other Parts Discussed in Thread: TPA3007D1

音频放大器TPA3007D1规格书里面的增益设置脚GAIN0和GAIN1,GAIN0和GAIN1分别取0或1,对应着四个增益值(12dB、18dB、23.6dB以及36dB)。这个增益值是指电压增益还是功率增益?