LM3875, LM3876 or LM3886? Which one produces better sound?

cumesoftware · 19th August 2011, 11:58 AM

In your opinion, which one of these chips is more pleasant to the ear? The LM3875, the LM3876 or the LM3886?

digits · 19th August 2011, 12:15 PM

LM1875. then lm3875 then the 3886, have not played with the 3876

cumesoftware · 24th August 2011, 11:43 AM

Thanks! I think I will consider using the LM3876 instead of the LM3886, since it is a version of the LM3875 with mute. Indeed the LM3875 has better S/N ratio than the LM3886, and the efficiency doesn't differ that much.

The only experience I have is with the LM3875. I will play with the '76 and see if there is any difference. I need the mute feature for my next project.

AndrewT · 24th August 2011, 02:09 PM

The typ & max noise (ein) is quoted as 2uV & <8uV {3875} cf. 2uV & <10uV {3886}, indicating they have very similar ein noise values.
When converting the S/N ratios, it appears that for the 3875, the ein ~=1.8uV and for the 3886, the ein ~= 2.4uV.

Both of these are close to the typ figures and seem to confirm that the 3875 is indeed slightly less noisy when tested to fig2 schematic.

terranigma · 26th August 2011, 11:38 PM

Quote:

Originally Posted by AndrewT

The typ & max noise (ein) is quoted as 2uV & <8uV {3875} cf. 2uV & <10uV {3886}, indicating they have very similar ein noise values.
When converting the S/N ratios, it appears that for the 3875, the ein ~=1.8uV and for the 3886, the ein ~= 2.4uV.

Both of these are close to the typ figures and seem to confirm that the 3875 is indeed slightly less noisy when tested to fig2 schematic.

But you still prefer discrete? It would be informative if some solid-state person share an opinion about these chips and National's other LME4981X driver stages.

AndrewT · 28th August 2011, 03:40 PM

I prefer what can drive the load properly.
Chipamps do well @ low power and/or with high efficiency speakers.
Above that I move to the chip driver + output stage or full discrete. But even with these the amplifier must be selected and built to suit the duty.

atomcf · 29th August 2011, 11:06 PM

Total noob question here, Is it possible to run 6 LM1875 as a left channel, and 6 as a right, with 1 direct 240 Volt input? running the amps on 25 watts each, getting 150 WPC at 8ohm, with 1.25 amps. and how would i wire it, parrallel or in series? (I've never built an amp before)

View Poll Results: Which one of these chips produces better sound?
LM3875	16	55.17%
LM3876	2	6.90%
LM3886	11	37.93%
Voters: 29. You may not vote on this poll

19th August 2011, 11:58 AM	#1
cumesoftware diyAudio Member Join Date: May 2008	LM3875, LM3876 or LM3886? Which one produces better sound? In your opinion, which one of these chips is more pleasant to the ear? The LM3875, the LM3876 or the LM3886?

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19th August 2011, 12:15 PM	#2
digits diyAudio Member Join Date: Apr 2011	LM1875. then lm3875 then the 3886, have not played with the 3876

24th August 2011, 11:43 AM	#3
cumesoftware diyAudio Member Join Date: May 2008	Thanks! I think I will consider using the LM3876 instead of the LM3886, since it is a version of the LM3875 with mute. Indeed the LM3875 has better S/N ratio than the LM3886, and the efficiency doesn't differ that much. The only experience I have is with the LM3875. I will play with the '76 and see if there is any difference. I need the mute feature for my next project.

24th August 2011, 02:09 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	The typ & max noise (ein) is quoted as 2uV & <8uV {3875} cf. 2uV & <10uV {3886}, indicating they have very similar ein noise values. When converting the S/N ratios, it appears that for the 3875, the ein ~=1.8uV and for the 3886, the ein ~= 2.4uV. Both of these are close to the typ figures and seem to confirm that the 3875 is indeed slightly less noisy when tested to fig2 schematic.

28th August 2011, 03:40 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I prefer what can drive the load properly. Chipamps do well @ low power and/or with high efficiency speakers. Above that I move to the chip driver + output stage or full discrete. But even with these the amplifier must be selected and built to suit the duty.

29th August 2011, 11:06 PM	#7
atomcf diyAudio Member Join Date: Aug 2011 Location: Hilly Hastings, UK	Total noob question here, Is it possible to run 6 LM1875 as a left channel, and 6 as a right, with 1 direct 240 Volt input? running the amps on 25 watts each, getting 150 WPC at 8ohm, with 1.25 amps. and how would i wire it, parrallel or in series? (I've never built an amp before)