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Original question:

TPA6120A2: TPA6120 POP Noise

TPA6120A2: TPA6120A2 volume control

aguilera gilles
Prodigy 120 points
Part Number: TPA6120A2
Other Parts Discussed in Thread: PCM5142

hi i would like to install a 50k potentiometer to be able to change the volume of the TPA6120A2 what would be the best place?
thank you

  • 0
    TI__Guru** 102945 points
    Hi Gilles,

    You could either place audio taper at the input, to adjust the amplitude of input signal; or you can also place potentiometer at feedback resistor, in series with a fixed resistor for "base" gain setting.
    In either case, there could be impedance mismatch between the input pair due to the variation of the potentiometer. This could cause pop noise, although this device is not enhanced for pop performance.
    Another option would be to add a previous stage (op amp) and apply the gain adjustment on this stage.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 120 points
    hi ivan it's ok I installed the potentiometer between the dac pcm5142 and the amp aop and it works very well thank you
    regards
    Gil