Hi,
I'd like to show you my PCB Layout for a 2 channel amplifier based on TDA7293. I would be happy if you could share your thoughts on it. Especially if you notice a design flaw or something that should be improved. I was looking for other layouts on the web but haven't found good results. Mostly posts or links were to old and not available anymore.
I added 3 possible capacitors on the feedback path as I read there could be done some "tuning" or testing.
The standby- / mute circuitry is done as stated in the datasheet of ST but the positive voltage to it can be switched with a relay.
I'm not sure with the ground layer and the placement of the feedback componentes.
I add 3 screenshots that show the top and bottom layer of the PCB and a 3D view of it. I may also provide the KiCAD files or Gerber files.
Thank you for any kind of help.
Greetings
Daniel
I'd like to show you my PCB Layout for a 2 channel amplifier based on TDA7293. I would be happy if you could share your thoughts on it. Especially if you notice a design flaw or something that should be improved. I was looking for other layouts on the web but haven't found good results. Mostly posts or links were to old and not available anymore.
I added 3 possible capacitors on the feedback path as I read there could be done some "tuning" or testing.
The standby- / mute circuitry is done as stated in the datasheet of ST but the positive voltage to it can be switched with a relay.
I'm not sure with the ground layer and the placement of the feedback componentes.
I add 3 screenshots that show the top and bottom layer of the PCB and a 3D view of it. I may also provide the KiCAD files or Gerber files.
Thank you for any kind of help.
Greetings
Daniel
Not sure of the scale of the board, but some of the traces look awfully close to one another. The thick traces bottom right for example.
Physical spacing is important - such as the trace that might end up under the mounting bolt washer in the top left and the capacitor proximity to where (presumably) a blade terminal will go (middle right).
The physical spacing of the capacitors top left seems different in image 1 than the 3d view - make sure there is enough space to physically install them with a small gap between each. Sometimes I find caps have a little flange at the bottom that can interfere with each other preventing installation. I tend to add a 0,5mm or 1mm gap between them to be sure.
Concentricity of the mounting hole top left is off (closer to the left side of the board than the right).
Can we see the schematic that you are working to?
Physical spacing is important - such as the trace that might end up under the mounting bolt washer in the top left and the capacitor proximity to where (presumably) a blade terminal will go (middle right).
The physical spacing of the capacitors top left seems different in image 1 than the 3d view - make sure there is enough space to physically install them with a small gap between each. Sometimes I find caps have a little flange at the bottom that can interfere with each other preventing installation. I tend to add a 0,5mm or 1mm gap between them to be sure.
Concentricity of the mounting hole top left is off (closer to the left side of the board than the right).
Can we see the schematic that you are working to?
If you are still looking for a design that works well:
https://www.diyaudio.com/community/threads/tda-7293-done-right.371174/page-3#post-6748390
https://www.diyaudio.com/community/threads/tda-7293-done-right.371174/page-3#post-6748390
I will take a look on this. Can you recommend values for spacing? As the voltage isn't high I didn't ake care about it.
That's right. I'll find a better route for this trace.
I already checked that, but you might be right that I placed the parts with some optimism 😉.
Sure. I gonna attach it to the first post if possible. There may still be some missing values.
Thank you. I've missed that thread.
Edit: Couldn't edit the initial post and attached the Kicad 6 files here.
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