TDA7294 bridged!

Maryus17 · 27th February 2004, 05:19 PM

I want to build an amplifier with 2 TDA7294's in bridge configuration. I would like to use the following schematic http://maryus17.freeservers.com/photo4.html .Can someone take alook at it and tell me if it's better than the one found in the Tda7294's datasheet.Do you know what kind of pot is r3 and what is it for?
Thx!

Maryus17 · 28th February 2004, 03:31 AM

Doesn't anybody know?

I want to build a tone control unit with Tda1524 or Tda1526 or with ne5532 . Wich is better to use with the tda7294?
Pls answer me! Cheers!

StratoFan · 1st March 2004, 08:08 PM

Hello!

I built a very simple bridge with 7294, and working well. The schematic is on the official datasheet:

Here is the finalized stereo gainclone:

Maryus17 · 1st March 2004, 09:52 PM

I have made my amp after that schematic and it works very well!

abid_rehan · 6th March 2004, 05:52 PM

This schematic mentioned in the official data sheet of the chip is alright but is mentioned in the schematic that it could not drive loads less than 8ohm, can anyone transform it to dreive loads like 4 OHMS?

Bricolo · 6th March 2004, 06:21 PM

Telling that It can't drive 4R loads is false, IMHO.

Look at the TDA7294 datasheet, there's a curve showing the minimum load vs the supply voltage

This means that you can't drive low loads with high voltage rails AT FULL POWER, because it will clip before. Driving low loads with high voltage rails much below the full power will work, but this may be nonsence
You'd better use lower voltage rails, that fit your load.

But to prevent the chips from clipping with a 4R loads, the rails could even have to be set to 10V or something like this. I think that this is the main problem

But, why do you want a bridged amp for a low load? You'll get more power in it with 2 paralleled modules

abid_rehan · 7th March 2004, 05:32 AM

Quote:

But, why do you want a bridged amp for a low load? You'll get more power in it with 2 paralleled modules

Thanks for your TIP BRIC, but would you be kind enough to direct me to a link where I could find scematics of TDA7294 use in parallel as I donot have the same..
Any help will be appreciated.

Bricolo · 7th March 2004, 10:14 AM

There's a schematic for this in the TDA7294S datasheet (you can find it at ST)

That's figure 7

StratoFan · 9th March 2004, 08:56 AM

Yes with paralleled mode you can use less sepaker impedance. But 7294 or 7294V is not the best solution. 7293 and 7294S chips have pin for parallel mode. I made this in these days, but unfortunately three chips demaged while I tested (the PCB got only + power). So now I have PCB for bridged/parallelled 7293, and I have single parallel amps because no chips enought

))

sk_tuner · 12th January 2006, 06:32 PM

can somebody refresh this pictures? I can´t see them

27th February 2004, 05:19 PM	#1
Maryus17 diyAudio Member Join Date: Feb 2004 Location: Galati, Romania	TDA7294 bridged! I want to build an amplifier with 2 TDA7294's in bridge configuration. I would like to use the following schematic http://maryus17.freeservers.com/photo4.html .Can someone take alook at it and tell me if it's better than the one found in the Tda7294's datasheet.Do you know what kind of pot is r3 and what is it for? Thx!

6th March 2004, 05:52 PM	#5
abid_rehan diyAudio Member Join Date: Mar 2007	TDA7294 Bridge This schematic mentioned in the official data sheet of the chip is alright but is mentioned in the schematic that it could not drive loads less than 8ohm, can anyone transform it to dreive loads like 4 OHMS?

12th January 2006, 06:32 PM	#10
sk_tuner diyAudio Member Join Date: Dec 2005 Location: sisak	can somebody refresh this pictures? I can´t see them __________________ sign. free

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28th February 2004, 03:31 AM	#2
Maryus17 diyAudio Member Join Date: Feb 2004 Location: Galati, Romania	Doesn't anybody know? I want to build a tone control unit with Tda1524 or Tda1526 or with ne5532 . Wich is better to use with the tda7294? Pls answer me! Cheers!

1st March 2004, 08:08 PM	#3
StratoFan diyAudio Member Join Date: Nov 2003 Location: Budapest, Hungary	Hello! I built a very simple bridge with 7294, and working well. The schematic is on the official datasheet: Here is the finalized stereo gainclone:

1st March 2004, 09:52 PM	#4
Maryus17 diyAudio Member Join Date: Feb 2004 Location: Galati, Romania	I have made my amp after that schematic and it works very well!

6th March 2004, 06:21 PM	#6
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	Telling that It can't drive 4R loads is false, IMHO. Look at the TDA7294 datasheet, there's a curve showing the minimum load vs the supply voltage This means that you can't drive low loads with high voltage rails AT FULL POWER, because it will clip before. Driving low loads with high voltage rails much below the full power will work, but this may be nonsence You'd better use lower voltage rails, that fit your load. But to prevent the chips from clipping with a 4R loads, the rails could even have to be set to 10V or something like this. I think that this is the main problem But, why do you want a bridged amp for a low load? You'll get more power in it with 2 paralleled modules

7th March 2004, 10:14 AM	#8
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	There's a schematic for this in the TDA7294S datasheet (you can find it at ST) That's figure 7

9th March 2004, 08:56 AM	#9
StratoFan diyAudio Member Join Date: Nov 2003 Location: Budapest, Hungary	Yes with paralleled mode you can use less sepaker impedance. But 7294 or 7294V is not the best solution. 7293 and 7294S chips have pin for parallel mode. I made this in these days, but unfortunately three chips demaged while I tested (the PCB got only + power). So now I have PCB for bridged/parallelled 7293, and I have single parallel amps because no chips enought ))

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