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TPA3255EVM: Boosting input gain of TPA3255EVM

Part Number: TPA3255EVM


We want to boost input gain of TPA3255EVM board after some researchs, i found that if you change R8 and R41 to 20K gain boosts to 2. Is that information correct? If it is not correct please reply with correct solution.


  • Hi Mustafa

        TPAA3255's loop gain is fixed. We are more recommend our customer to change the input signal level to control the final output.

        The R8 and R41 on the EVM, if you change their value, the output of the amplifier U5 will change, in this way you can reach your goal. But it's not that recommend to do this, because U5 is used for filter purpose, change the resistor value will affect the cut-off frequency, may affect the final audio performance.

  • Hi Shadow He

    Thanks for your support.

    In this situation i can't change the input signal level. I have to change gain to solve my problem. How do i boost/change input gain?

  • Hi Mustafa

        Considering your situation, changing resistor R8 and R41 would be the most simple way, and this is the only place we can change on the EVM. Other solution would be to build another small amplify board, to adjust the input signal first, then send it to the EVM.

  • Hi Shadow He

    Thanks a lot, i really appreciate it.