Tda7294 again .!!

PROFESSOUR2003 · 14th June 2010, 09:12 PM

HI,
I intend to build this circuit for my stereo amp. each channel will consist of 2 tda7294 in bridge mode all i need is pretty pcb for this circuit-or i`ll have to build it on general purpose board..lool- & any one have any comment or modification about the circuit i am glad to hear it...
I will use 24-0-24 10 amp. transformer
2 * 8 ohm speakers
and this circuit for tone control
THNX,,,,

PROFESSOUR2003 · 15th June 2010, 10:19 AM

32 views and 0 reply ...!!??

adil · 28th June 2010, 06:43 AM

good amp

sangram · 28th June 2010, 12:09 PM

24 Volt transformers will result in rails of about 33-35V depending on mains voltage. You risk frying the chips with that voltage and that load. For 25V rails I would use 18 or 19V transformer.

Using a single resistor to bridge the chips will work, but I don't know that it is ideal in terms of performance. It might be worthwhile to explore a dedicated balanced line driver chip or use the second amplifier in inverting mode with a few suitable modifications in the gain resistors.

Good Luck.

riktw · 28th June 2010, 12:50 PM

use a 18V transformer, better for the chip :P
and design a neat PCB for it, a good amp deserves it imho
but TDA7294 amplifiers are very good, i personally like them more then the normal lm3886.
but for power supply, a good 2 * 18V transformer, 225VA per channel, and 20.000uF per channel for capasitors.
now build it and be amazed

PROFESSOUR2003 · 28th June 2010, 07:18 PM

i have successfully built it and i will upload photos as soon as possible
THNX

Hosam · 31st January 2011, 01:06 PM

I just have question about the power supply, does 2x22v transformer will effect the chip as sangram mention above?

I want to build two PCB one single TDA and the other one is bridge 2xTDA. if I want to use power supply for both is it good to keep each one with own power supply or its better to use power supply for both "bridge and single TDA's"?

nikko · 09:14 PM

View from the APEX you have finished the project.
TDA7294 Stereo/Bridge with PSU
Greeting

ianpengelly · 2nd February 2011, 10:07 PM

According to the datasheet in the bridge configuration +/- 35V rails is more than acceptable and offers upto 170W output. The max permissable is +/- 40V, so there is no worry of frying this chip with the transformer suggested. What did you use in the end PROFESSOUR2003?

Are you pleased with the results?

2nd February 2011, 09:10 PM	#8
nikko diyAudio Member Join Date: Sep 2006 Location: Sarajevo	View from the APEX you have finished the project. TDA7294 Stereo/Bridge with PSU Greeting Last edited by nikko; 2nd February 2011 at 09:14 PM.

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15th June 2010, 10:19 AM	#2
PROFESSOUR2003 diyAudio Member Join Date: Nov 2009	32 views and 0 reply ...!!??

28th June 2010, 06:43 AM	#3
adil diyAudio Member Join Date: Jun 2010	good amp

28th June 2010, 12:09 PM	#4
sangram diyAudio Member Join Date: Sep 2002 Location: India	24 Volt transformers will result in rails of about 33-35V depending on mains voltage. You risk frying the chips with that voltage and that load. For 25V rails I would use 18 or 19V transformer. Using a single resistor to bridge the chips will work, but I don't know that it is ideal in terms of performance. It might be worthwhile to explore a dedicated balanced line driver chip or use the second amplifier in inverting mode with a few suitable modifications in the gain resistors. Good Luck.

28th June 2010, 12:50 PM	#5
riktw diyAudio Member Join Date: Sep 2007	use a 18V transformer, better for the chip :P and design a neat PCB for it, a good amp deserves it imho but TDA7294 amplifiers are very good, i personally like them more then the normal lm3886. but for power supply, a good 2 * 18V transformer, 225VA per channel, and 20.000uF per channel for capasitors. now build it and be amazed

28th June 2010, 07:18 PM	#6
PROFESSOUR2003 diyAudio Member Join Date: Nov 2009	i have successfully built it and i will upload photos as soon as possible THNX

31st January 2011, 01:06 PM	#7
Hosam diyAudio Member Join Date: Jan 2011 Location: Syria - Canada	I just have question about the power supply, does 2x22v transformer will effect the chip as sangram mention above? I want to build two PCB one single TDA and the other one is bridge 2xTDA. if I want to use power supply for both is it good to keep each one with own power supply or its better to use power supply for both "bridge and single TDA's"?

2nd February 2011, 10:07 PM	#9
ianpengelly diyAudio Member Join Date: Oct 2006	According to the datasheet in the bridge configuration +/- 35V rails is more than acceptable and offers upto 170W output. The max permissable is +/- 40V, so there is no worry of frying this chip with the transformer suggested. What did you use in the end PROFESSOUR2003? Are you pleased with the results?