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Chip Amps Amplifiers based on integrated circuits

Help find replacement board with Tda7294 chip
Help find replacement board with Tda7294 chip
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Old 7th September 2019, 10:49 AM   #1
Urielp is offline Urielp
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Join Date: Sep 2019
Default Help find replacement board with Tda7294 chip

Hi all,

I am currently trying to fix a sub that i got and i think that i ruined the amplifier board.
I tried to look for replacment and i did not find any.
Tried to contact the manufacturer but he refuse to provide one.
The board is based on Tda7294 chip,
The attached image is the board that i want to replace.

Can anyone please advise?

Thanks in advance
Attached Images
File Type: jpg IMG_20190729_194424.jpg (986.9 KB, 114 views)

Last edited by Urielp; 7th September 2019 at 03:15 PM. Reason: adding pics
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Old 7th September 2019, 02:46 PM   #2
Fast Eddie D is offline Fast Eddie D  United States
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Join Date: May 2010
Location: Skokie Il
Quote:
Originally Posted by Urielp View Post
Hi all,

I am currently trying to fix a sub that i got and i think that i ruined the amplifier board.
I tried to look for replacment and i did not find any.
Tried to contact the manufacturer but he refuse to provide one.
The board is based on Tda7294 chip,
The attached image is the board that i want to replace.

Can anyone please advise?

Thanks in advance
There's millions of pre-assembled chip amps on Flea Bay.

What's the power supply voltage? Is it a split supply?

If you can't answer these simple questions, then step away from the soldering iron.
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Old 7th September 2019, 03:36 PM   #3
Urielp is offline Urielp
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Join Date: Sep 2019
sorry,you are right,
i forgot to attched some pics witht the info,
and i must say that i like the soldering iron :-)

this is the specification from the manufactor site :

Driver 8” WOOFER
4 Ohm RMS Power 100W
Total Efficiency >80%
Frequency Response 45Hz-150Hz
Crossover Variable 50Hz to 150Hz
Distortion <1%
Signal to Noise Ratio ≥90dB
Bass Boost (35Hz) +6dB
Input Sensitivity 5mV
Auto Power on Sensitivity 115mV
Temperature 65c
Hi Level Input Sensitivity 1.2V
Hi Level Output Sensitivity 1.2V
Input Power AC115V & 230V

i think i found the facotry that manufactor this sub ,but they refuse to sell any replacment part.
Hi FI active subwoofer SUB 8 creative subwoofer, View active subwoofer china, audio live Product Details from Vistron (Dongguan) Audio Equipment Co., Ltd. on Alibaba.com

i also thinking of using diffrent parts but this is connected to control panel that in charge of stand by/phase/volume etc so need somthing that can connect to that.

Last edited by Urielp; 7th September 2019 at 03:44 PM.
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Old 7th September 2019, 04:01 PM   #4
Fast Eddie D is offline Fast Eddie D  United States
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Join Date: May 2010
Location: Skokie Il
Quote:
Originally Posted by Urielp View Post
Total Efficiency >80%
Impossible.

No loudspeaker is even close to 80% efficient. Anything over 1% is remarkable.

No class AB amp is close to 80% efficient.

You "manufacturer" is peddling snake oil. It's no different than an auto mechanic that sells you blinker fluid. I've reverse engineered dozens of consumer audio products and most "manufacturers" just mix up a bunch of cheap junk that someone else built. This even goes for "high end" consumer stuff like Onkyo, who to their credit build their own amplifiers but all the DACs, control boards, DSPs, etc are "embedded solutions" that they just splice in there. This is the exact same junk you buy on Flea Bay. It makes me wonder if some of these "manufacturers" have an actual engineer on their staff, because anyone with a little knowledge of electronics could do what they do, and do it better.

I pulled a JVC subwoofer out of the dumpster. The power amplifier was incinerated. I put a cheap TDA something board in there that I bought for $10. Fixed. It's a piece of crap, but it was a piece of crap when it was brand new.
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Old 7th September 2019, 04:03 PM   #5
DUG is offline DUG  Canada
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Join Date: Jan 2003
Location: mississauga ontario canada
How about this?:

Dayton Audio SA100 100W Subwoofer Plate Amplifier
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Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
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Old 7th September 2019, 04:10 PM   #6
Fast Eddie D is offline Fast Eddie D  United States
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Join Date: May 2010
Location: Skokie Il
Quote:
Originally Posted by DUG View Post
That's probably nicer than what they put in most subwoofers from the big box store.

I don't think you can beat that for the money unless you want to go real cheap and wire a bunch of Flea Bay junk together.

I have some Dayton Audio stuff. It's top notch for the money.
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Old 7th September 2019, 04:22 PM   #7
Urielp is offline Urielp
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Join Date: Sep 2019
funny that you mention the JVC story, @Fast Eddie D,
i also found this sub in dumpster ,it did not worked due to bad chip and blown capacitor,
and this manufactor is supposed to be one of the top speaker manufacto here.
and this sub model should be nice to small system.i just really wanted the challenge.

@DUG,it could be good solution if i wont be able to find a replacment for that board,
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Old 7th September 2019, 04:37 PM   #8
sgrossklass is online now sgrossklass  Germany
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Join Date: Nov 2004
Location: Germany
That amplifier board doesn't look too "ruined" to me (no holes burned into it or anything), what's wrong with it apart from possibly a bad TDA? I only spot some suspicious black mounting glue, that stuff will have to go ASAP and parts covered by it inspected for corrosion / replaced if necessary.
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Old 7th September 2019, 04:54 PM   #9
Urielp is offline Urielp
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Join Date: Sep 2019
The issue is in the other side,
The connections of the tda gone bad, some of them lost the connection and only plastic was left, i manage to do sove override , but still not working, it is no more blowing fuses but it is just stuck in stand-by mode
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Old 7th September 2019, 05:20 PM   #10
Fast Eddie D is offline Fast Eddie D  United States
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Join Date: May 2010
Location: Skokie Il
Quote:
Originally Posted by Urielp View Post
The issue is in the other side,
The connections of the tda gone bad, some of them lost the connection and only plastic was left, i manage to do sove override , but still not working, it is no more blowing fuses but it is just stuck in stand-by mode
The board was poorly assembled, and it overheated. It was probably not adequately designed in the first place.
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