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Old 2nd December 2006, 07:00 PM   #1
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Default 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
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Old 3rd December 2006, 08:58 AM   #2
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It looks to me like you haven't connected the mute pins to V+. Check for that.
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Old 3rd December 2006, 09:24 AM   #3
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That I quite possible
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Old 3rd December 2006, 12:11 PM   #4
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http://kitsrus.com/pdf/k106.pdf
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Old 3rd December 2006, 12:50 PM   #5
luka is offline luka  Slovenia
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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.
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Old 3rd December 2006, 05:06 PM   #6
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I think the chips would already look like the one in my avatar if he connected C6 wrong way.
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