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Old 4th November 2013, 04:32 PM   #11
rsavas is offline rsavas  Canada
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Take a look at the Elektor Q-watt article, as a guide. It is free so why not.
Q-Watt Audio Power Amplifier - ELEKTOR.com | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement
LME49811 seems to be slightly better performer than LME49810 but does not contain the clip flag and baker clamp.
My recommendation is to make the design able to use both of these parts and evaluate
I was wondering what would the best way to make 2 pairs of outputs bjt's using LME49811
Funny how the 49810 has twice the amount of distortion and more slew rate than 49810, any ideas as to why?
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Old 4th November 2013, 05:34 PM   #12
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Originally Posted by rsavas View Post
...LME49811 seems to be slightly better performer than LME49810 but does not contain the clip flag and baker clamp.....Funny how the 49810 has twice the amount of distortion and more slew rate than 49810, any ideas as to why?
Hey, yes but can you tell us which one you really think is better?
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Old 4th November 2013, 05:36 PM   #13
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LME49811 slewrate was measured in its data sheet with a 30pf compensation cap.
In the -810 data sheet it was not...
Thats why.
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Old 4th November 2013, 05:47 PM   #14
rsavas is offline rsavas  Canada
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Quote:
Hey, yes but can you tell us which one you really think is better?
That I can not say as I never evaluated, that is why I ask to see if anyone else has done so.

Thx palstanturhin
You have read better than I. Have you evaluated the difference in operation?
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Old 5th November 2013, 04:34 AM   #15
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It is impossible to hear a difference between 810,811 and 830. If one can hear a difference, it is because of something else in the circuitry, not because of the chip.
With identical output stages, they will sound identical.
IMHO.

Choose the chip according to your needs, for example:
Very High Power ClassAB BJT output stage; -810
"Low"Power/ClassA; definitely -811
Mosfets; -830

The best of the best of the best is however, -811
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Old 5th November 2013, 08:41 AM   #16
Boscoe is offline Boscoe  United Kingdom
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Quote:
Originally Posted by palstanturhin View Post
It is impossible to hear a difference between 810,811 and 830. If one can hear a difference, it is because of something else in the circuitry, not because of the chip.
With identical output stages, they will sound identical.
IMHO.

Choose the chip according to your needs, for example:
Very High Power ClassAB BJT output stage; -810
"Low"Power/ClassA; definitely -811
Mosfets; -830

The best of the best of the best is however, -811
Even with different output stages unless someone does something mental with them the distortions too low - you can't hear amplifiers over speakers.
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Old 5th November 2013, 10:13 AM   #17
basi is offline basi  Croatia
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Originally Posted by AndrewT View Post
Buy driver transistors. These should be rated around 1A to 2A. Even going to 4A is OK
Hi Andrew!!

I been searching last night for drivers transistor and i found these on my local supplier.

MJE15030,MJE15031

BD240C,BD239C ---2A

BD241C,BD242C---3A


BD243C,BD244c---6A


Wich pair of these will be ok for my circuit?
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Old 5th November 2013, 11:08 AM   #18
AndrewT is offline AndrewT  Scotland
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The MJE and the 243/4 are both greater than 4A continuous Id. Suitable for very high output current into low impedance loads.
The MJE is also very high Vceo.

Have a look at 2sb649/d669 which would make very good drivers if they were not obsolete.

Try to find other drivers that approach those 649/669 parameters. Particularly fT and SOAR.

Check that Vceo is >=110% of rail to rail voltage.
Check SOAR @ Vce = rail voltage. This is (roughly) the region where the current limit is first exceeded when driving a reactive speaker.
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Last edited by AndrewT; 5th November 2013 at 11:19 AM.
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Old 5th November 2013, 11:53 AM   #19
basi is offline basi  Croatia
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How about Nte373,nte374 those have indentical parameters.
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Old 5th November 2013, 10:50 PM   #20
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Take a look at Profusions website listing of driver transistors. They have been selling good Taiwanese clones of 2SD6649/B649 and other good parts for some time now. This covers any real need for obsolete parts, provided you can place a total order for economical quantities. Ivanlukic has bought there recently and seemed happy with his Unisonic drivers, give them a try.
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