This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hello,
I do not understand the purpose of R16 in this circuit. It creates a minimum gain that is much too high. Can this resistor be removed and replaced with a jumper?
Also, please be advised that when this board is used with the TPA3220EVM-MICRO, the TPA3220EVM-MICRO will not supply the required 12V power needed for operation. The literature would lead you to believe that all modules with the AIB connector would supply this power. Unfortunately, there is no place provided on the SIDEGIG-GUITAREVM to accept an external source other than the AIB connector.
Thanks,
Tom
Hi,
Thank you for your reply, but you misunderstand. I was referring to R16 on the SIDEGIG-GUITAREVM. Not on the TPA3220EVM-MICRO. It relates to the gain of U2A.
I have no issues with the power supplies for the TPA3220. I was just making sure that people knew that the TPA3220EVM-MICRO does not supply 12V to the AIB connector. If they want to use an extension module with this board, that requires a 12V supply, it will need to be provided externally. There is no 12V source on the module.
Tom
Hi Robert,
I apologize for the delay. With a .72V 1kHz input to the GuitarEVM, I have a .69V output at minimum volume and a 3.2V output at maximum volume.
Tom
Hi Robert,
I have eliminated R16 and installed a shunt. I now get acceptable control with the volume knob, and there is still enough headroom. I had to create a separate power supply board to power the module, and it wasn't easy to deliver it to the board, but it is working. Thanks for your help. I am going to mark this thread as resolved.
Tom