TPA3128D2EVM: How do you adjust the gain? Is Potentiometer bypassed?

Bosco Kante

Part Number: TPA3128D2EVM
Other Parts Discussed in Thread: TPA3128D2

I just received the TPA3128D2EVM and I tried turning the potentiometer, but the gain does not change. Is there a jumper or other kind of setting that is bypassing the potentiometer? I need to increase the gain.

Thanks for any help!

over 6 years ago

0 Bosco Kante over 6 years ago

Prodigy 20 points

I see that the potentiometer R4 that I was turning changes the Power limit voltage and not the gain. I still need to increase the gain however, as my source is low voltage ~0.7v

0 Shawn Zheng over 6 years ago

TI__Mastermind 24835 points

Hello,
TPA3128D2 gain can be set to 20, 26, 32 and 36 dB. You can change the R5 and R7 resistors to select the gain on the EVM. Please find more info about this in section 7.3.1 in the TPA3128D2 datasheet.
Best regards,
Shawn Zheng

Audio

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TPA3128D2EVM: How do you adjust the gain? Is Potentiometer bypassed?