LM3886 vs TDA7294 - Page 2 - diyAudio
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Old 28th November 2005, 10:48 AM   #11
Jay is offline Jay  Indonesia
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Hi thomgun,

If you can source IC through direct order to manufacturer or by internet purchase, why not try the Tripath TA2020? The PCB design will be very challenging, especially for you

But I haven't heard that 7294 has 2 versions...

Fake transistors (may be IC also I'm not sure) in my experience has worse maximum allowable voltage/current. So, as far as you aren't those bassmen, you should be save (except for the sound quality ). Hey, high supply voltage often means worse audio quality! Beside the PSSR issue, lower supply tend to be mellow, more like tube amp hehehe.
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Old 28th November 2005, 10:51 AM   #12
Jay is offline Jay  Indonesia
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Quote:
Originally posted by jaudio


According to the application notes the power supply voltage are about the same and there is a 1.5 amp difference in current.

tda7294 +/-40 10A
lm3886 +/-42 11.5A

lm3886 might deliver more power.
The power in 3886 is limited by the built-in current limiting circuit. So I guess 7294 can go higher with acceptable result.
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Old 28th November 2005, 12:07 PM   #13
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Jay What is the max current for the LM3886?


So as far power pay no attention to the application notes?
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Old 28th November 2005, 07:47 PM   #14
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Jaudio is right, the LM3886 has more current, around the same power and lower distortion.
The problem is always the same, on the TDA datasheet they put on the first page '100V - 100W DMOS AUDIO AMPLIFIER'.
Well, +/-50V (100V) is max supply voltage, no signal.
100W is 'Music power'.

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Old 29th November 2005, 03:43 AM   #15
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For what it is worth...

I've had a set of Altec Lansing ACS48 2.1 computer speakers for over 7 years now, and I accidentally blew out the midrange speakers over the weekend. I disassembled the amplifier to discover that it is powered by three discrete TDA7294s and has an Avel Lindberg 17V 160VA torodial transformer inside.

I can tell you that these have been EXCELLENT set of speakers. Very quiet, good range and a nearly flat response. I did have to use EQ to correct the upper end of the mids and the bottom end of the treble (less than a 3db boost, but uniform across the affected area), but I blame this COMPLETELY on the cheap speaker cones inside the unit.

I am currently building an LM3875 Gainclone, but will now also try to source new speakers for this busted computer amp. Perhaps I can post a useful comparison in the near future.
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Old 29th November 2005, 12:59 PM   #16
Jay is offline Jay  Indonesia
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Quote:
Originally posted by jaudio
Jay What is the max current for the LM3886?
So as far power pay no attention to the application notes?
Hi jaudio, I'm afraid Carlos has the answer regarding the 100V-100W

Actually I had compared by ears that 3886 sounded louder than 7294. This is with 10V secondaries where I can drive the amps without volume control. But my concern is whether we have equal plafonds (maximums) for both chips.

Given an 3886, I will happily put a bet that when an acceptable (don't know, THD 10%? Just before clipping) music is played with 3886, with +/-42V, the 11.5 amperes is never achieved. My poin is, I won't (yet) take those numbers as their maximum capability.
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Old 29th November 2005, 02:01 PM   #17
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Quote:
Originally posted by thomgun_lc
Hi there,i'm eager to build this 7294's amp to compare with my LM3886.3886 has a great sound but i don't know about TDA 7294 sound. Can 7294 beat 3886??i still don't know. Some people said that 7294 better than 3886. But, i still very happy with my gainclone 3886.
regards
---------
TomZ
tda7294 has already beaten 3886.its a great ic.very very robust.it forgives errors and it sounds EXCELLENT.
response is flat throughout the band.70w continous.crystal clear sound ,not 'painted' like 3886 which is heavier on bass.
only a single anomally,its difficult to solder bec of less seperation b/w pins.but the pain taken to solder is worth it.

someone said 'louder' to his ears.my advise,plz check the connections properly.
i built 3 of each.halted further 'production' of 3886 bec all those who listened,voted in favour of mosfets.

my vote goes to tda7294.its greatest.

thomgun:::::::lz dont use so many smilies.they irk.
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Old 29th November 2005, 02:46 PM   #18
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Quote:
Originally posted by sagarverma

tda7294 has already beaten 3886.its a great ic.very very robust.it forgives errors and it sounds EXCELLENT.
I have yet to have a lm3886 fail.
Quote:
Originally posted by sagarverma
70w continous.crystal clear sound ,not 'painted' like 3886 which is heavier on bass.


I cant speak to that, it is an opinion.
Quote:
Originally posted by sagarverma

i built 3 of each.halted further 'production' of 3886 bec all those who listened,voted in favour of mosfets.
I almost always have mosfets is the chain but I can easily remove it, if the sound gets a little to laid back


Quote:
Originally posted by sagarverma

my vote goes to tda7294.its greatest.
If you are happy Im happy for you.
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Old 29th November 2005, 03:06 PM   #19
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Quote:
I have yet to have a lm3886 fail.
change that to tda7294 for me.one lm failed and took my $100 woofer along with it.

Quote:
I cant speak to that, it is an opinion.
i have done tests.plz know all b4 discrediting.its not opinion but hard fact based on measurements.
lm had 50w continous.


Quote:
If you are happy Im happy for you.
i m really very very satisfied with this wonder chip from great company ST Microelectronics.
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Old 29th November 2005, 05:18 PM   #20
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Quote:
Originally posted by sagarverma


tda7294 has already beaten 3886.its a great ic.very very robust.it forgives errors and it sounds EXCELLENT.
response is flat throughout the band.70w continous.crystal clear sound ,not 'painted' like 3886 which is heavier on bass.

Please show me the test especially the one for "painted" and heavier bass. And as far as the way it sound,I still say the an opinion. I could be sitting in the same room as you and not like the way the TDA7294 sound. That would be my opinion
.
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