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TPA152的问题~~

Other Parts Discussed in Thread: TPA152

最近刚接触耳机运放,手头有个TPA152,做个试试,根据DATASHEET里面的典型电路,怎么去修改音量的大小呢?改变增益么?GAIN=(RF/RI).  有效阻抗=RF*RI/(RF+RI)

要求有效阻抗在5~20之间,要改变音量是不是改变RF或者RI??