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Old 2nd March 2007, 03:56 PM   #1
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Default 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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Old 3rd March 2007, 10:18 PM   #2
sek is offline sek  Germany
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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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