Help...TDA7294 bridged can't work

yikchean · 2nd December 2006, 06:00 PM

hi...
i'm facing the TDA7294 bridged problem...i hv done the amp but cant work totally...i followed the schematic from the datasheet...and i'm using +-35V become the power supply....but i hv measure it, and it has the correct voltage..but the chip doesn't has any heat on it...is the chip burned

or other thing?.i need your helps....thanks

Cro maniac · 3rd December 2006, 07:58 AM

It looks to me like you haven't connected the mute pins to V+. Check for that.

luka · 3rd December 2006, 08:24 AM

That I quite possible

jaudio · 3rd December 2006, 11:11 AM

http://kitsrus.com/pdf/k106.pdf

luka · 3rd December 2006, 11:50 AM

Hi

Quote:

If it does not work :
Dry joints caused by poor soldering are the most common reason that the circuit does not work. Check all soldered joints carefully under a good light. Resolder any that look suspicious. Check that all components are in their correct position on the PCB, and the electrolytic capacitors in the right way round. Make sure you have inserted the links for Mute and Standby. Remember that the metal tab on the IC is internally connected to the negative supply rail, so check that the negative supply rail is not shorted to ground.

This would be good way to start

Also watch for C6 as is wrong way on PCB as they say.

Cro maniac · 3rd December 2006, 04:06 PM

I think the chips would already look like the one in my avatar if he connected C6 wrong way.

2nd December 2006, 06:00 PM	#1
yikchean diyAudio Member Join Date: Apr 2006 Location: Penang n KL	Help...TDA7294 bridged can't work hi... i'm facing the TDA7294 bridged problem...i hv done the amp but cant work totally...i followed the schematic from the datasheet...and i'm using +-35V become the power supply....but i hv measure it, and it has the correct voltage..but the chip doesn't has any heat on it...is the chip burned or other thing?.i need your helps....thanks

3rd December 2006, 08:24 AM	#3
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	That I quite possible __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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3rd December 2006, 07:58 AM	#2
Cro maniac diyAudio Member Join Date: Feb 2004 Location: Zagreb, Croatia Blog Entries: 2	It looks to me like you haven't connected the mute pins to V+. Check for that.

3rd December 2006, 11:11 AM	#4
jaudio diyAudio Member Join Date: Oct 2004	http://kitsrus.com/pdf/k106.pdf

3rd December 2006, 04:06 PM	#6
Cro maniac diyAudio Member Join Date: Feb 2004 Location: Zagreb, Croatia Blog Entries: 2	I think the chips would already look like the one in my avatar if he connected C6 wrong way.

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