LM3886 Switching power supply

epilot · 09:57 PM

Hello guys,

Just wanted to know if it is usual and recommended to use a Switching power supply for an LM3886 power amp chip? Or it is recommended to use an EI or triode power supply for the said power amp as is used?

Thanks a lot

pacificblue · 24th March 2012, 12:14 PM

SMPS is not usual, but has been done. Usually SMPS are still more expensive than unregulated power supplies with similar performance, therefore most amps are built with the latter. EIs and toroids are both OK for the purpose. Most people choose toroids for design reasons and easier availablity.

kumori · 24th March 2012, 05:27 PM

Linn uses SMPS in their (Chip-)Poweramps.

In regular intervals you can see them on ebay for not much money. A friend of mine has one of them which was used for a 2 x 100 W Linn amp. They give out +27 / 0 / -27 Volts, so are perfectly suited for lm3886s.

Maybe this is the cheapest way to get a audio-quality(!) SMPS with enough output power.

Mark.Clappers · 24th March 2012, 05:41 PM

I did a 4 channel LM3886 amp with 2 meanwell SMPS (320W each), works perfectly.

Nuuk · 28th July 2012, 02:49 PM

Quote:

Originally Posted by kumori

Linn uses SMPS in their (Chip-)Poweramps.

In regular intervals you can see them on ebay for not much money. A friend of mine has one of them which was used for a 2 x 100 W Linn amp. They give out +27 / 0 / -27 Volts, so are perfectly suited for lm3886s.

Maybe this is the cheapest way to get a audio-quality(!) SMPS with enough output power.

kumori (if you are still around) do you mean that you can buy the Linn SMPS on Ebay? I've been looking for a split rail SMPS on Ebay for some time now without any success.

KatieandDad · 28th July 2012, 04:21 PM

I've just been on E-Bay and the dual supply SMPS supplies seem to have vanished. They do come up so just keep looking.

Our oriental friends will sell anything that someone will buy.

Nuuk · 28th July 2012, 05:06 PM

Quote:

Originally Posted by KatieandDad

I've just been on E-Bay and the dual supply SMPS supplies seem to have vanished. They do come up so just keep looking.

Our oriental friends will sell anything that someone will buy.

Thanks, I'll keep watching.

djoffe · 28th July 2012, 08:48 PM

The GT-101 Kit may be of interest to you...LM3886's and a regulated linear power supply...

Akitika GT-101

Nuuk · 28th July 2012, 10:05 PM

Quote:

Originally Posted by djoffe

The GT-101 Kit may be of interest to you...LM3886's and a regulated linear power supply...

Akitika GT-101

djoffe - thanks for the link but I've got linear power supplies falling out of every cupboard.

None of them seem to be as good as the 12 volt SMPS units that I am using, hence I want some higher power units.

(and I prefer the LM3875 to the LM3886)

djoffe · 28th July 2012, 10:22 PM

They look quite similar...at an admittedly (too) quick reading, the main difference seems to be presence/absence of mute...I'm curious...Is there another reason for your preference?

23rd March 2012, 09:53 PM	#1
epilot diyAudio Member Join Date: Jul 2006	LM3886 Switching power supply Hello guys, Just wanted to know if it is usual and recommended to use a Switching power supply for an LM3886 power amp chip? Or it is recommended to use an EI or triode power supply for the said power amp as is used? Thanks a lot Last edited by epilot; 23rd March 2012 at 09:57 PM.

24th March 2012, 12:14 PM	#2
pacificblue diyAudio Member Join Date: May 2008	SMPS is not usual, but has been done. Usually SMPS are still more expensive than unregulated power supplies with similar performance, therefore most amps are built with the latter. EIs and toroids are both OK for the purpose. Most people choose toroids for design reasons and easier availablity. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

24th March 2012, 05:41 PM	#4
Mark.Clappers diyAudio Member Join Date: Jan 2010 Location: The Netherlands, near the German border	I did a 4 channel LM3886 amp with 2 meanwell SMPS (320W each), works perfectly. __________________ Music is art - Audio is psychoacoustics & engineering

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24th March 2012, 05:27 PM	#3
kumori diyAudio Member Join Date: Mar 2011	Linn uses SMPS in their (Chip-)Poweramps. In regular intervals you can see them on ebay for not much money. A friend of mine has one of them which was used for a 2 x 100 W Linn amp. They give out +27 / 0 / -27 Volts, so are perfectly suited for lm3886s. Maybe this is the cheapest way to get a audio-quality(!) SMPS with enough output power.

28th July 2012, 04:21 PM	#6
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	I've just been on E-Bay and the dual supply SMPS supplies seem to have vanished. They do come up so just keep looking. Our oriental friends will sell anything that someone will buy.

28th July 2012, 08:48 PM	#8
djoffe diyAudio Member Join Date: Oct 2008	The GT-101 Kit may be of interest to you...LM3886's and a regulated linear power supply... Akitika GT-101

28th July 2012, 10:22 PM	#10
djoffe diyAudio Member Join Date: Oct 2008	They look quite similar...at an admittedly (too) quick reading, the main difference seems to be presence/absence of mute...I'm curious...Is there another reason for your preference?

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