TDA7293 ChipAmp

[santitrucco]

Hi ,

I have a new board stereo with TDA7293..

I did change some values and quality components.

Is good to use 0.66uf input cap , NFB Resist 85k , shunt resistor 3.3k ( 25x ) 220uf Nfb cap , and 100uf Bootstrap ?
I prefer sound quality to Watts.

is important to use a good diodes ,or original is good ( KBL608 ) ?

Santiago

 

[santitrucco]

?

 

[nigelwright7557]

I would use something better for diodes.
Something with higher current rating in case of amp failure.
Loads of options at RS COmponents.

 

[santitrucco]

But what do you thing with this values component for hifi ?

 

[santitrucco]

The voltage is 42vcc

 

[avtech]

The datasheet has good recommendations on page 10 as to alternative values. I'd suggest paying attention to the effects that they state - for example setting the correct closed loop gain via R2 and R3.

https://www.st.com/resource/en/datasheet/tda7293.pdf

Also, without knowing what specific implementation of the TDA7293 you have, how can anyone help you out properly?

 

[santitrucco]

I know the original diagram, but here are people who make the integrated circuit work much better than with the original diagram.
I would like to ask them if the values ​​of the components I use are correct.

 

[santitrucco]

 

[nigelwright7557]

I would be very careful changing component values from chip manufacturer datasheet.
The original chip manufacturer will have done some serious work to get the components right.
A change in value doesn't automatically mean a better result, its just as easy to go the wrong way or create an instability.

 

[santitrucco]

some members like , danielwritesbac , upgrade the 7294 with diferents values with excellents results..

Santiago

 

[nigelwright7557]

some members like , danielwritesbac , upgrade the 7294 with diferents values with excellents results..

Santiago

I really don't think the original circuit was so bad that it needs any upgrades/changes.

 

[abraxalito]

As with any chipamp, the key to getting good sound lies in the PSU. The TDA7293 has some advantage over the LM3886 (for example) in that the signal and power pins are separated, meaning that the signal circuitry can be decoupled separately. Don't try this trick on the -ve supply pins though as the substrate goes to the signal power not the output power. Best run the chip from a single rail in bridged mode so that the -ve rail PSRR isn't an issue and pins 8 & 15 can be wired together.

 

[lavr2019]

Hello! I built 3 amps on TDA293 as datasheet schematic, as Hi-Fi ????????????? ????????? ?? TDA7293 / 7294, and as http://lincor-lib.narod.ru/Amps2.htm link "MF-1". MUCH better sound I get of MF-1. I compared all 3 variants on same music and Acoustic. So, I recommend MF-1 schematic