LM1875 sound better than LM3886?? - Page 3 - diyAudio
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Old 5th November 2010, 02:19 AM   #21
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I did a listening test with a LM1875 and a TDA2050 on different but identical boards ( and parts). There was a difference in sound. But both are good.
Right now I can't tell you the exact differences as this was done long ago and I didn't take down notes. But you can try it out as it's easy to swap out the chips.
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Old 5th November 2010, 03:35 AM   #22
doggy is offline doggy  Canada
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The LM3875 does not get much attention, I have 3 others LM3886,LM4780, the 3875 is my favorite and it also has the best bass.
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Old 5th November 2010, 05:17 AM   #23
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3875 ......it did get some attention initially but was swept aside by the 3886.Not quite sure why that was but we can often read that people who have used both 3875 and 3886 prefer the 3875. But not many dedicated threads on that one. Wonder why......because it's too simple to implement ?

Must pull out my 3875 chips one of these days and complete the amp.
Must build a stereo board with on board power supply.
Cheers.

Has anyone used the 3875 without the NFB bypass cap C1 ? I'd expect it to sound better ! DC off set might be tolerable ?
Would dc injected at the input be enough to compensate the dc offset ? It might not be too stable but if it keeps the output within +/- 0.1V it should be safe I guess.
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Last edited by ashok; 5th November 2010 at 05:42 AM.
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Old 5th November 2010, 05:50 AM   #24
doggy is offline doggy  Canada
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I think if you compare the data sheets, the LM3875 has a slightly higher thd.of .06 vs. .04 for the 3886 but the signal to noise ratio is better @95 db vs 92 db.

I have the P. Daniel boards for the lm3875; the amp has very good power almost enough most of the time.

It is said the uninsulated chip can disipate more heat through a silpad, perhaps being able to be driven harder and maybe use a slightly higher supply voltage, any thoughts on this?:

The LM1875 looks also an interesting option
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Old 5th November 2010, 08:17 AM   #25
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Quote:
Originally Posted by abraxalito View Post
...TDA2030As (which are even cheaper) re-badged as LMs. Here in China an (apparently genuine) LM1875 goes for a little over $1 but TDA2050s are less than half that.
That's about right, here in India as well. The LM1875 is just over $1 locally, and the TDA2050A is just shy of $0.5. The 60W, 7-pin TDA2052 is being quoted at about $1.40, which seems to be a pretty good price for an LM3886-class chipamp, especially since the LM3886TF is north of $7 at retail here.

A bridged/parallel TDA2052 would seem to be a fairly compelling idea. Even better if it's nested within an outer feedback loop around an opamp, a la Mauro Penasa's MyRef.
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Old 5th November 2010, 11:45 AM   #26
jamal is offline jamal  Singapore
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hi doggy, could you wire up the LM1875 and tell us the different, I will be waiting for your opinion .should you say LM3875 is better than LM1875. I will right away built the LM3875 amp.............thanks

Quote:
Originally Posted by doggy View Post
I think if you compare the data sheets, the LM3875 has a slightly higher thd.of .06 vs. .04 for the 3886 but the signal to noise ratio is better @95 db vs 92 db.

I have the P. Daniel boards for the lm3875; the amp has very good power almost enough most of the time.

It is said the uninsulated chip can disipate more heat through a silpad, perhaps being able to be driven harder and maybe use a slightly higher supply voltage, any thoughts on this?:

The LM1875 looks also an interesting option
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Old 6th November 2010, 07:25 AM   #27
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Quote:
Originally Posted by linuxguru View Post
A bridged/parallel TDA2052 would seem to be a fairly compelling idea. Even better if it's nested within an outer feedback loop around an opamp, a la Mauro Penasa's MyRef.
Linuxguru, so are you going to try out the MyRef topology with the
TDA2052? Might make an excellent value prop, if the sonics are right.
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Old 6th November 2010, 11:16 AM   #28
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Quote:
Originally Posted by quadtech View Post
Linuxguru, so are you going to try out the MyRef topology with the
TDA2052? Might make an excellent value prop, if the sonics are right.
I'm looking at it, now that the LM3886TFs are becoming unobtainium. The TDA2052 can do ~60W into 4 ohms with +/- 30V rails, so 2 x TDA2052 in bridged configuration should be able to deliver 100W+ into 8 ohms with +/- 30V rails.

The sonics of the TDA2052 are reputedly not as good as the LM3886, but that probably doesn't matter much if they're going to be used as Howland pumps. The sonics of the bridged MyRef will mostly be that of the small-signal opamp in the outer loop.
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Old 6th November 2010, 12:19 PM   #29
jamal is offline jamal  Singapore
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TDA 2052 have higher THD than LM3886. is it worth the effort of building it.
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Old 6th November 2010, 04:21 PM   #30
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Quote:
Originally Posted by jamal View Post
TDA 2052 have higher THD than LM3886. is it worth the effort of building it.
It probably wouldn't be worth it in a plain gainclone, where the premium price of the LM3886 is justified, in view of the improved sonics.

However, in a MyRef, the chipamp doesn't contribute much to sonics - its role is that of a pure transconductance amp with the transconductance being set almost entirely by precision resistors. Here, alternate chipamps can be used without appreciable impact on sonics - however, there may have to be some tweaks to the compensation networks.

It isn't a trivial substitution (a SPICE model of the TDA2052 would have been handy), but probably worth the money for a bridged configuration, where the savings on two chipamps is significant. The price of the ST TDA2052 parts is now about 20% of the original Natsemi LM3886TFs, and availability isn't an issue either.
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