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Old 5th December 2010, 11:15 AM   #1
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Default PCB for TDA 7294 based amplifier - new

I am uploading the PCB layout for 50 W AF amplifier using TDA 7294.
Attached Images
File Type: jpg 7294 PCB.jpg (401.1 KB, 679 views)
File Type: jpg TDA7294 Circuit.jpg (56.7 KB, 601 views)
Attached Files
File Type: pdf PCB - TDA7294 LAYOUT.pdf (22.6 KB, 280 views)
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Old 5th December 2010, 03:58 PM   #2
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Polarity of C8 is wrong in the schematic.
Are size and shape of C8 correct on the PCB?
How do you connect the mute/standby pin on the V+ trace with C9 on top of it?
Why are C3 and C4 of different size and shape on the PCB?
C4 should be next to the TDA's power pins.
The muting/standby circuit in the schematic is different from the PCB.

Have you tested your layout? If not, you should either mention that in the text or not publish it.
There have already been situations when newbies relied on a published design, copied it and later spent a lot of time and money only to find out that it didn't work or spent even more to tweak it and make it work.
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Old 6th December 2010, 11:19 AM   #3
ratza is offline ratza  Romania
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Does the polarity of C8 matter at all, since it's connected on the NFB? It's not a trick question, I'm just curious about this.
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Old 6th December 2010, 05:02 PM   #4
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It does not matter with regards the function, because it will see AC anyhow. It is more a convention that is left over from the times of single supply amplifiers, where the output would always be more positive than the ground. You just do it like that so that you get used to having it the right way round, should you decide to build a single supply amp one day.
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Old 6th December 2010, 11:06 PM   #5
Minion is offline Minion  Canada
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Thats PCB is very simular to the one in the TDA7293 datasheet

Last edited by Minion; 6th December 2010 at 11:10 PM.
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Old 7th December 2010, 10:03 AM   #6
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The layout is very assymetrical and I expect that it will introduce hum because of the poor supply routing...

My suggestion is to go back to the drawing board and work on the routing/layout.
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Old 25th May 2014, 07:27 PM   #7
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to tda7294 experts,

may i know the voltage rating of bootstrap capcitor. Is the 25volt rating sufficent?
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