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Chip Amps Amplifiers based on integrated circuits

TDA7293 versus LM3886 sound quality
TDA7293 versus LM3886 sound quality
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Old 15th November 2011, 05:59 AM   #1
dildel is offline dildel  India
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Default TDA7293 versus LM3886 sound quality

Has anyone compared TDA7293 and LM3886 side-by-side with a pair of audiophile grade speakers? I am asking because LM3886 supposedly has lower levels of distortion. Is it really audible?

Design and implementation complexity of both is about the same and has been compared in earlier threads.
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Old 15th November 2011, 07:36 AM   #2
suntechnik is offline suntechnik  Russian Federation
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There many onions regarding the subject. PLS consider that Operational Amplifier depends on a quality of passive components.

Also LM3886 uses quasi complementary BJTs for an output stage that is taking into account modern ICs optimization making LM a bit ahead of TDA.

imho LM3886 is more popular IC overall and therefore you can get better support that might be the most important concern for DIY project.
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Old 15th November 2011, 11:59 AM   #3
blakkshepeaudio is offline blakkshepeaudio  Australia
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The absence of the Dreaded spike protection circuitry may give the TDA7293 the edge if there is any chance of getting close to the edge. Just a thought.
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Old 16th November 2011, 01:21 PM   #4
kuldeepsingh is offline kuldeepsingh  India
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i have done some listening between LM1875 and TDA2050. LM1875 has a very transparent sound and clear sound, but i felt TDA2050 gave a much warmer and richer sound. Both i operated on 18V on medium listening level.
similarly i feel the best way to compare is to made both the amplifiers and do blind listening test. How you perceive sound is a very personal choice.
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Old 27th November 2011, 02:38 AM   #5
simply14prem is offline simply14prem  Switzerland
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As far as the quality of ic I got here is concerned ,Lm1875 sounds like ****.I m back to TDA 2040 .It is just cool.After doing many tweaks in lm1875 ,the amp sounds like a class A amp.That thing is not negotiable 2 me.If my Lm ic is fake then Tda is also fake.Many people like Lm.I wud say a bias.May b our ears are dissimilar.Just a though no offence.
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Old 27th November 2011, 04:51 AM   #6
Einric is offline Einric  United States
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I have also compared TDA7294 bridged side by side w/ an LM4780 Paralleled.
The TDA sounded warmer on the low end but the LM4780 is more precise.
I am now working on a Tube front end for my LM's to try and warm them up.
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Old 27th November 2011, 11:47 AM   #7
DIGORA is offline DIGORA  Belgium
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The best sounding TDA schematic according to Franšis IBRE http://www.eyrolles.com/Accueil/Aute...cis-ibre-61265


(inverting the minus BYW98)

Last edited by DIGORA; 27th November 2011 at 11:54 AM.
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Old 27th November 2011, 02:52 PM   #8
AndrewT is offline AndrewT  Scotland
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why does the first link take me to adverts for books?
why does the second link take me to a remote server upload page?

I am reporting your post.
regards Andrew T.
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Old 27th November 2011, 03:48 PM   #9
Leglandu is offline Leglandu  France
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AndrewT, I believe the first link was just to reference Mr Ibre as a recognized writer in France...

The second link has some wrong spaces so fail :


The idea is to separate pre-amp and amp DC supplies, Mr Ibre explained that the sound is really better this way and another guy realized the schematics :
Fangorn - comme un arbre dans la ville ...

Important : seems that replacing the BYW98 by a resistor will destroy the chip, by delaying too much the power at pre-amp, at start-up...

This is a simplification of the "kit Hermes" tip (see description page 7 of 8) :

Translated for you, thanks google :

"The drivers of entry to the CI are fed by pin 7 (+ Vs) and 8 (-Vs). The trick is to supply the drivers with a voltage higher than that of the power. A difference of 10V just about. Thus, we can remove the capacitor bootstrap (C8).
Specifically, just provide few volts further, and change a little the card. (We do can't provide a guarantee as a result of this optional intervention)

Cut two pieces of track with a cutter to locations detailed below. Move directly to the two square pads tensions + Vs and - Vs with isolated copper wires.
Beware short circuits, hazardous voltages you vehicle. There is no shame in using a microscope to check quality of your work!

It should be double. We use a transformer with two separate secondary windings: these two additional voltages will be in series with the positive and negative power stage.
Do not exceed the + and - 30V for the transformer power section not to exceed the limits of constructor.

Last edited by Leglandu; 27th November 2011 at 04:16 PM.
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Old 11th December 2011, 08:22 AM   #10
dildel is offline dildel  India
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Thanks for this information. I think it's safe to conclude that one of them isn't significantly better than the other. I'll go for building one that's easier and safer
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