Decent LM3886 amplifier

[georgiano]

hello guys.

i'd wanted to build 3886 amplifier for a long time, but couldn't decide wich schematic to use. i found this forum several days ago(it was such a surprise for me that lm3886's were such respected chipamps), and downloaded several schematics from here.

my problem is that i can only build schematic, and i'm totaly helpless in creativity. i mean looking/examining scheme i can not figure out what and how to change to make it work and sound better.

well, i'm looking for help and advice from you guys.
which schematic do you recomend to build, looking at quality - not simplicity? i know, "best" is word subjective, and if it cannot be said wich design is best, it certainly can be said wich ones not to build. so there must be well proven designs, that are a head above over others.

i understand that this question would be often raised up, and that i should use search, but searching this forum and finding long threads(some over 170 pages ) they say nothing to me because higher skills required to understand them.

well, i have built several amps before, solid state and tube, so i'm not totally dumb at all

my goal is to build decent sounding (as much can be achaived from 3886's) amplifier for 60 wats of power at 4 ohms of load.

can someone give some decent schematics?

thanks for reading this

[rudi]

Well Georgiano

you an always start with this one
http://www.diyaudio.com/forums/showt...507#post609507
it is very good and sounds really nice. but if you want to really make it compelling you can try this for size. it is the same amp with a beefed up power supply, and there is just no touching it
http://www.diyaudio.com/forums/showt...679#post782679

then there is always the design from Carlos. I never heard it but he swears by it. much less complex
http://www.diyaudio.com/forums/showt...271#post783271

but i have to admit that the X-Calibre is my favourite. (but i would say say, since i have done all the work on it)

[Bazukaz]

I would recommend you use circuit that is in Lm3886 datasheet.
It can be found at www.national.com

It is very simple and easy to build.
However , don't forget that all ground connections must come to a one ground point.Forgetting to do so may cause stability problems or/and increased distortion.

[Jay]

The balanced one is the best sounding. But it is not a well proven design. Unless you know electronics well, you should find help from metalman to build one without much problem. Unless Nelson Pass himself design the schematic, I will prefer to stay away

[sagarverma]

hi Jay,

its your territory(lm).advise req.i also need that(my lm amp burned out and took away my $100 pioneer woofer with it )

[georgiano]

Well Georgiano

you an always start with this one
http://www.diyaudio.com/forums/show...9507#post609507
it is very good and sounds really nice. but if you want to really make it compelling you can try this for size. it is the same amp with a beefed up power supply, and there is just no touching it
http://www.diyaudio.com/forums/show...2679#post782679

well, i was considering to build mauros design. i found schematic on first page. but found on 170-th page that there was RevC version of it. i cannot read all the 170 pages. do you have this version of his amp?

i read X-Calibre topic too. is your amp's final version available on topic's first page?

there was also word Thorsen floating around. i couldnt find out what it is, looks like it is a good design too.

I would recommend you use circuit that is in Lm3886 datasheet

something makes me to think that schematic in datasheet shouldn't be the greatest available. i don't like "example" word in there

The balanced one is the best sounding. But it is not a well proven design. Unless you know electronics well, you should find help from metalman to build one without much problem. Unless Nelson Pass himself design the schematic, I will prefer to stay away

sounds chinese to my ears

[Nordic]

Somewhere between page 152 and 156, we posted the full schematic.... sure you'll find it now.

[Jay]

Hi sagarverma,

nice cat you have there! I always like cats because they seems to like me. I don't know why, but I guess they have a good intuition about good people

Anyway, I have lots of experience with chip amps in the past, but not with GC. I built several GC but don't have enough time for tweaking and comparing with the same setup, so it is actually difficult to tell which schematic is better than which.

Often, first impression tells the truth. So I was impressed with balanced one (hi georgiano, sound chinese you said?), and the single supply example. (Hi georgiano, National examples are not as bad as Philips').

And then about inverting schematic. It is almost coincidence that everytime I like my chip amps (or opamps pre), they happen to be inverted. And I have good impression with inverted GC as well (compared to non-inverted).

[sagarverma]

hi jay,

i have made only single ckt of lm,from app. notes.its ok.but due to my fault,it smoked out and took my woofer with it.



offline::::::cats r cute,so r cubs(lion's strictly).

[georgiano]

hi georgiano, sound chinese you said?

yep

Hi georgiano, National examples are not as bad as Philips'

yea, but i am looking for the good one, not for "not as bad" one.