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Chip Amps Amplifiers based on integrated circuits

Optimizing TDA7294 Output
Optimizing TDA7294 Output
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Old 13th January 2019, 05:46 PM   #871
santitrucco is offline santitrucco  Argentina
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Gabito74 and what vale resistor did you use?
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Old 14th January 2019, 10:51 AM   #872
gabito74 is offline gabito74  Argentina
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I used 270K for R1, R2 and R3. And multilayer ceramic 470nF for C1 and C2. See figure 1 in the datasheet of TDA7294.
Take special care in the equality of R1 and R3 to avoid offset at the output.
I used these big resistor values to reduce capacitances and avoid the use of electrolytic for signal purpose.
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Old 14th January 2019, 11:13 AM   #873
gabito74 is offline gabito74  Argentina
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Quote:
Originally Posted by nigelwright7557 View Post
The tda7294 has a minimum gain before it starts to become unstable.
I think its about 22.
You could change R4 to 1K but that's about the limit.
Manual say
CLOSED LOOP GAIN HAS TO BE >24dB
But it does not say it's because of possible instability.
I checked, I used it with low voltage gain.
Then I can say with certainty that there is no instability using lower gain.

On the other hand, I experimented IC overheating with the boucherot cell.
perhaps the boucherot cell has problems because of the low gain. Maybe that's what they refer to in the manual. But my solution is
NOT to use boucherot cell. My amplifiers are not used with long cables. then I should not have problems.
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Old 10th February 2019, 02:02 AM   #874
santitrucco is offline santitrucco  Argentina
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Hi , which is the way to obtain best sound from tda7293.
40 watts is enough for me.
Without bootsrap , with less NFB , without cell boucherot ?
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Old 10th February 2019, 02:31 AM   #875
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by santitrucco View Post
Hi , which is the way to obtain best sound from tda7293.
40 watts is enough for me....
Under volting is sure to make it work better. So aim for 20+20vac transformer or maybe even as high as 22+22vac transformer, and see my sig line for the rest.
40 watts of that in stereo, would be like a big storm indoors. You could aim a little lower if it is for use in a house.
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Old 23rd February 2019, 03:01 AM   #876
santitrucco is offline santitrucco  Argentina
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Hi friends, i have a new module with TDA7293, but with 60hz noise ( 0.012V ) in left channel.

Whyyy ?
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Old 23rd February 2019, 05:46 PM   #877
santitrucco is offline santitrucco  Argentina
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Friends i build a tda7293 module estereo , and i have 60hz hum in one channel.
0.014v ac ,is not a lot of ac noise, but why ?
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Old 25th February 2019, 11:37 AM   #878
gabito74 is offline gabito74  Argentina
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60 hz in Argentina?
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Old 25th February 2019, 11:42 AM   #879
gabito74 is offline gabito74  Argentina
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Quote:
Originally Posted by santitrucco View Post
Hi , which is the way to obtain best sound from tda7293.
40 watts is enough for me.
Without bootsrap , with less NFB , without cell boucherot ?
With Bootstrap!
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Old 25th February 2019, 03:54 PM   #880
santitrucco is offline santitrucco  Argentina
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OK , gabito74 !!
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