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Open source layout for a TDA7293 composite amp
Open source layout for a TDA7293 composite amp
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Old 13th August 2021, 07:46 PM   #41
bebo65 is offline bebo65  Germany
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...read the thread you did start (TDA7293- done right?) - it is almost done!
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Old 24th September 2021, 02:30 PM   #42
WLA is offline WLA  United States
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Default TDA7293 composite amplifier done right

Hello guys,
Has anyone seen that website - Low Distortion Composite Amplifiers LM1875 TDA7293 TDA7294
There is a lot of info, circuits, PCB, etc. concerning composite amplifiers and TDA7293 in particular.
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Old 24th September 2021, 04:42 PM   #43
joensd is offline joensd  Germany
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Thanks for posting that!
Very interesting page!

Not too far from what we´ve implemented in the prototype.
Vast differences between controlling opamps and resulting THD but that is to be expected depending on choice and individual? compensations.
Dropped a mail to the site owner to see which opamps he used and if they are individually compensated.
Anyways results are quite good!

Our prototype works with both LM4562+OPA1656 but without THD-measurements there´s hardly any proof of how well the composite works.
Have to see how far I get with the cheap soundcards that I have.
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Old 24th September 2021, 06:51 PM   #44
WLA is offline WLA  United States
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I asked the guy the same thing a few days ago but all I got was an extensive explanation of the criteria of which the operational amplifier has to meet. It doesn't help much though. Hopefully you will have more luck.
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Old 24th September 2021, 07:17 PM   #45
Clueless but avid is offline Clueless but avid  Germany
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Many thanks for posting that link! Very interesting page.
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Old 24th September 2021, 07:53 PM   #46
MalleMike is offline MalleMike  Spain
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post 31 by joensd : I do not see why it would be unfair to parallel the TDA as its done with the LM3886 as well , even by Tom in his Modulus 686. Only difference is that it is much more critical with the LM whereas with the TDA it is easy and simple to do . The LM has a higher possible dissipation and current than the TDA , the TDA higher rail-voltage but easy to parallel so why not use the advantage this provides , especially for loads of 4 or even 3 ohms . Lots of subwoofers dip to that. Plus the fact that two TDA cost roughly the same or less than one LM. Paralelling three of them one is on the safe side no matter what even with the rails at 50 volts , and beeing able to reduce the heatsinks to a more reasonable size at the same time .
I just got ten of them from China and yes , I measured them one by one to make sure they are not fakes , for a total of 15 dollars, shipping included

1pcs/lot TDA7293 TDA7293V ZIP-15 IC In Stock ....Total: US $14.68
so with those 10 I can experiment and try a few things now.


post 42 from WLA : thanks for that info something to jump on and devour , cheers

Last edited by MalleMike; 24th September 2021 at 07:57 PM.
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Old 27th September 2021, 07:13 AM   #47
WLA is offline WLA  United States
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Quote:
Originally Posted by joensd View Post
Thanks for posting that!
Very interesting page!
....
Dropped a mail to the site owner to see which opamps he used and if they are individually compensated.
Anyways results are quite good!
Hi JD,
Did you hear from the guy?
I'm very curious how to find the best possible Op Amp.
I'm thinking that at the end of the day I'm going to order a finished PCB and find the answer in the easiest way.
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Old 27th September 2021, 10:41 AM   #48
MalleMike is offline MalleMike  Spain
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Hi WLA read the thread :



TDA7293- done right?



for more info. lots of good contributions in it from several members
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Old 27th September 2021, 01:23 PM   #49
WLA is offline WLA  United States
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It is a great project (TDA7293- done right?) but in quite early stage I think.

I read the thread but still not clear what is the best op amp to use and not much info about the performance.

It would be greatly appreciated it if you provide more info.
Thanks
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Old 27th September 2021, 05:47 PM   #50
MalleMike is offline MalleMike  Spain
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In some ways its early in others its not . These things tend to be slow at first and then to speed up . We all have our lives dictating how much time and when we can invest in this .You are more than welcome to add your grain to it if you want .


I do not think there will be any "best" op-amp but rather a number of suitable ones , depending on taste as they do sound slightly different.......................................

Last edited by MalleMike; 27th September 2021 at 05:50 PM.
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