What do you think about this LM3886 desigh?

gabanyayaya · 8th February 2009, 01:53 AM

Hi

A friend of mine just gave this LM3886 schematic to me. Probably not the most simplify gainclone I ever saw... I need some feedback from anyone who thinks there's improvement can be made....and do anybody think this is a good design for the LM3886TF ??? Advice and recommendation is much appreciated...

ratza · 8th February 2009, 07:55 AM

This design is useless. Why don't you use the schematic from the data sheet of LM3886?

jazzy939 · 8th February 2009, 01:22 PM

ratza,
Useless in what way?

AndrewT · 8th February 2009, 01:58 PM

I suspect the designer did not know what effect each component had on the performance of this amp.
If the builder does not understand the operation of this specialised schematic then steer clear.
I would not entertain it.

gabanyayaya · 9th February 2009, 12:06 AM

Quote:

Originally posted by AndrewT
I suspect the designer did not know what effect each component had on the performance of this amp.
If the builder does not understand the operation of this specialised schematic then steer clear.
I would not entertain it.

wow...that much....!!!

you mean a simplified LM3886 circuit is better than this...?

gabanyayaya · 9th February 2009, 03:43 AM

Quote:

Originally posted by ratza
This design is useless. Why don't you use the schematic from the data sheet of LM3886?

ratza how do you tell this is a useless without hearing it???? Does theories good enough to judge the quality of it....I'm very curious... ???

ratza · 9th February 2009, 03:21 PM

It's easy to explain how it will sound, by just looking on the negative reaction. It will boost the frequencies under 100Hz, it can literally blow your speakers. This might be a poor attempt to create a subwoofer amplifier.

gabanyayaya · 10th February 2009, 02:55 PM

Well... looks like committing a suicide here.

How about this one...he got two circuit and this is suppose to be a simplified version from the first one...any critics.

ratza · 10th February 2009, 04:55 PM

That's exactly what I use (and many others, I think), except that the 470uF capacitors are 330uf paralleled with 100nF ceramic.

mitchelr · 11th February 2009, 12:26 PM

Hi
I have a LM3886 and
I have a 25-0-25 Transformer = approx +/- 35v, could I use the above circuit, or would it need modifying slightly

Thanks for your time
Ron

8th February 2009, 01:53 AM	#1
gabanyayaya diyAudio Member Join Date: Aug 2008	What do you think about this LM3886 desigh? Hi A friend of mine just gave this LM3886 schematic to me. Probably not the most simplify gainclone I ever saw... I need some feedback from anyone who thinks there's improvement can be made....and do anybody think this is a good design for the LM3886TF ??? Advice and recommendation is much appreciated...

8th February 2009, 07:55 AM	#2
ratza diyAudio Member Join Date: Dec 2007 Location: Sibiu, Romania	This design is useless. Why don't you use the schematic from the data sheet of LM3886? __________________ Any solution is a compromise.

8th February 2009, 01:58 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I suspect the designer did not know what effect each component had on the performance of this amp. If the builder does not understand the operation of this specialised schematic then steer clear. I would not entertain it. __________________ regards Andrew T.

9th February 2009, 03:21 PM	#7
ratza diyAudio Member Join Date: Dec 2007 Location: Sibiu, Romania	It's easy to explain how it will sound, by just looking on the negative reaction. It will boost the frequencies under 100Hz, it can literally blow your speakers. This might be a poor attempt to create a subwoofer amplifier. __________________ Any solution is a compromise.

10th February 2009, 04:55 PM	#9
ratza diyAudio Member Join Date: Dec 2007 Location: Sibiu, Romania	That's exactly what I use (and many others, I think), except that the 470uF capacitors are 330uf paralleled with 100nF ceramic. __________________ Any solution is a compromise.


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8th February 2009, 01:22 PM	#3
jazzy939 diyAudio Member Join Date: Nov 2007	ratza, Useless in what way?

10th February 2009, 02:55 PM	#8
gabanyayaya diyAudio Member Join Date: Aug 2008	Well... looks like committing a suicide here. How about this one...he got two circuit and this is suppose to be a simplified version from the first one...any critics.

11th February 2009, 12:26 PM	#10
mitchelr diyAudio Member Join Date: Nov 2008	Hi I have a LM3886 and I have a 25-0-25 Transformer = approx +/- 35v, could I use the above circuit, or would it need modifying slightly Thanks for your time Ron

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