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Old 23rd March 2012, 09:53 PM   #1
epilot is offline epilot  United States
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Default 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.
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Old 24th March 2012, 12:14 PM   #2
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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.
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Old 24th March 2012, 05:27 PM   #3
kumori is offline kumori  Europe
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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.
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Old 24th March 2012, 05:41 PM   #4
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I did a 4 channel LM3886 amp with 2 meanwell SMPS (320W each), works perfectly.
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Old 28th July 2012, 02:49 PM   #5
Nuuk is offline Nuuk  United Kingdom
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Quote:
Originally Posted by kumori View Post
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.
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Old 28th July 2012, 04:21 PM   #6
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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.
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Old 28th July 2012, 05:06 PM   #7
Nuuk is offline Nuuk  United Kingdom
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Quote:
Originally Posted by KatieandDad View Post
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.
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Old 28th July 2012, 08:48 PM   #8
djoffe is offline djoffe  United States
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The GT-101 Kit may be of interest to you...LM3886's and a regulated linear power supply...

Akitika GT-101
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Old 28th July 2012, 10:05 PM   #9
Nuuk is offline Nuuk  United Kingdom
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Originally Posted by djoffe View Post
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)
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Old 28th July 2012, 10:22 PM   #10
djoffe is offline djoffe  United States
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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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