Hello everyone, I am making an audio amplifier with TDA7297, I've finished the PCB layout and wiring already and soon will manufacture it. Before that, I hope you guys can give me some advice or anything that I have to be mindful about, so I can make sure it can work after manufacturing. Here are the schematic and the pictures of the PCB. If you guys need more information about the PCB please tell me. Thank you guys so much!

 

Hope to get you guys advice!

 

It's not a question of "did I do it right",
it's more a question of how much crazy abusive testing do You expect it to survive.

You are the one trying to create a product,
what are your design goals / specifications ????
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.
.

 

It's not a question of "did I do it right",
it's more a question of how much crazy abusive testing do You expect it to survive.

You are the one trying to create a product,
what are your design goals / specifications ????
.
.
.

I mean that to make sure it works properly in normal conditions. Like, I'm scared there are some factors like the way I wired the components or the leads too close to each other that can affect the signal integrity.

 

Also, is polygon pour with the net GND affect the input or output signal of the circuit? Hope you can help me!

 

Linear audio power amplifiers are weird. They don't just require power supply decoupling - they demand it.

1. Increase C5 to the value shown on the datasheet.

2. Move both C4 and C5 to be closer to U1. The 100 nF should be as close as possible to a power pin, with the electrolytic jammed up behind it. Even better, since you have two power pins and a ground plane, is to double the decoupling. Put a capacitor pair next to each U2 power pin.

ak

 

[\QUOTE]
Your advice is so helpful. I have changed everything that you've said. Here is the new schematic that I have added another decoupling for the IC. Is there anything I should change to make it better? Like the signal connection, teardrops, or stuff? Thank you so much!

 

Did you test it?
You can never know for sure until you test it, test again, and test once more.

 

Did you test it?
You can never know for sure until you test it, test again, and test once more.

Thank you for reminding me. I have tested it. The sound seems a bit noise when adding another decoupling.