TDA7294 Schematic PCB

hernanstafe · 2nd March 2007, 03:56 PM

I have a doubt with this pcb. How and what do i connect in the outputs in the red circle? i mean i have to put a switch or what? what's the COM Pinout? the speaker goes between out and gnd or out and com or what?! i don't know how to use that thing.

http://img339.imageshack.us/my.php?image=drawingno5.jpg

sek · 3rd March 2007, 10:18 PM

Hi,

a working link to the picture is: http://img339.imageshack.us/my.php?image=drawingno5.jpg
It shows ST's original application circuit board layout, which is BTW not recommended. Even Elektor managed to make a better one many years ago.

The COM pin is the return (ground) for Standby and Mute.
Have a look at page one of the datasheet to see what switch is required for what functionality.
I recommend the TDA7293, btw. Higher current capability, safer for the same heat sink size and pin compatible.

Take a look at this for a very sophisticated TDA729x project, this site has some more, but not all of it is in English.

Cheers,
Sebastian.

2nd March 2007, 03:56 PM	#1
hernanstafe diyAudio Member Join Date: Feb 2007 Location: Argentina	TDA7294 Schematic PCB I have a doubt with this pcb. How and what do i connect in the outputs in the red circle? i mean i have to put a switch or what? what's the COM Pinout? the speaker goes between out and gnd or out and com or what?! i don't know how to use that thing. http://img339.imageshack.us/my.php?image=drawingno5.jpg

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3rd March 2007, 10:18 PM	#2
sek diyAudio Member Join Date: May 2003 Location: Berlin	Hi, a working link to the picture is: http://img339.imageshack.us/my.php?image=drawingno5.jpg It shows ST's original application circuit board layout, which is BTW not recommended. Even Elektor managed to make a better one many years ago. The COM pin is the return (ground) for Standby and Mute. Have a look at page one of the datasheet to see what switch is required for what functionality. I recommend the TDA7293, btw. Higher current capability, safer for the same heat sink size and pin compatible. Take a look at this for a very sophisticated TDA729x project, this site has some more, but not all of it is in English. Cheers, Sebastian.

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