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TPA3136D2: TPA3136D2如何设计增益调节电路???

Part Number: TPA3136D2

Dear TI 工程师: 

我们公司即将用TPA3136D2设计出一套音频功放产品,但我作为新人一枚,看到了原理图上的参考电路, 我有一些疑惑,希望能得到TI工程师的专业解答,不胜感激。

首先,如芯片数据表的参考电路如下,我如何设计功放的音量调节电路?????