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Chip Amps Amplifiers based on integrated circuits

TDA7294 IC works with 12-0-12v transformer
TDA7294 IC works with 12-0-12v transformer
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Old 1st October 2017, 07:09 PM   #1
Ujash is offline Ujash
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Default TDA7294 IC works with 12-0-12v transformer

I order tda7294ic and i have 12-0-12v 10a transformer but i dont know it will works with tda7294 for higher performance. Or it will require 25-0-25v 5a transformer.
Datasheet says it needs +-10 to +-40 volts and i have 8 ohm 10 inches speakers. So 12-0-12v 10a transformer is enough for deliver output power up to 70watts.
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Old 1st October 2017, 09:08 PM   #2
OlegSh is offline OlegSh
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TDA7294 IC works with 12-0-12v transformer
Hi Ujash,

If you need around 70 Watt output into 8 Ohm then you need transformer with 25-0-25v secondary. To get a better idea of what supply voltage and thus transformer rating you need have a look at this article.

Regards,
Oleg
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Old 4th October 2017, 05:12 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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The problem with low power supply voltages is the transient response.
Any transients will get clipped and sound bad.
I would also go for 25-0-25 transformer.
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Old 4th October 2017, 05:34 PM   #4
overpower is offline overpower
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It also works 12-0-12 transformer but soud is weak and bad because just as noted nigelwright7557.

Some day ago I too just tested some TDA7293 and TDA7294 circuits and if i tried use 12-0-12 transformer, then sound quality is bad, maybe only some first W sound is listenable but not more.
You need minimal 16-0-16 transformer or as mentioned, maybe 25-0-25, I also test this chips19-0-19 AC volts (+-28V DC) and sound quality is much better than 12-0-12.
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Old 4th October 2017, 07:25 PM   #5
Chris888 is offline Chris888  United Kingdom
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Quote:
Originally Posted by Ujash View Post
I order tda7294ic and i have 12-0-12v 10a transformer but i dont know it will works with tda7294 for higher performance. Or it will require 25-0-25v 5a transformer.
Datasheet says it needs +-10 to +-40 volts and i have 8 ohm 10 inches speakers. So 12-0-12v 10a transformer is enough for deliver output power up to 70watts.
70W into 8ohms from a 12-0-12 transformer is not easy to do well.
You could consider a bridge circuit?
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