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.
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.
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.
The GT-101 Kit may be of interest to you...LM3886's and a regulated linear power supply...
Akitika GT-101
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)
They used to appear regularly on ebay. Usually, because people upgrade to the newer Linn "dynamic" SMPS. But the old ones have been used until about two years ago, so they should be perfectly fine. You just have to get one which was used in a poweramp.
They sound different to me. The 3875 sounding slightly more subtle, and more musical.
I've found one on Ebay:
Meanwell NES 350 350W 27V DC 13A SMPS switching power supply GENUINE | eBay
Looks like it has a fan though. Is that standard on the higher-powered SMPS units?
Meanwell NES 350 350W 27V DC 13A SMPS switching power supply GENUINE | eBay
Looks like it has a fan though. Is that standard on the higher-powered SMPS units?
No, it's the usual Ebay seller ambiguity Andrew. I would obviously ask a few questions of them before ordering one.
I'm still not completely sure that I need one as the pair of 12v Skynets seem to be 'man-enough' to drive my speakers more than loud enough without clipping. It's just that audiophile curiousity of what would it sound like with a higher-powered PSU.
if they were dual polarity (+V and -V) then a pair at $49 each plus whatever they charge to get them out of China would be a good buy for a dual channel chipamp.
But if it costs $98 + postage for a single chipamp channel then they are not good value.
The 36V + 36V @ 9A, would be good for a 60W 3886 driving an 8ohms speaker load.
But if it costs $98 + postage for a single chipamp channel then they are not good value.
The 36V + 36V @ 9A, would be good for a 60W 3886 driving an 8ohms speaker load.
The picture appears to show three connections each for +27v and -12v but where is 0v? If it is connected to the mains earth then there would appear to be no way of adding a loop-breaker.
It pretty much is. It is also quite common that the fans are temperature-controlled.
The NE series is quite inexpensive because it has no power factor correction, the load and line regulation are a bit worse than in the more expensive models, guarantee time is shorter and the fan has no constant speed control but only on/off control. The S after NE means single rail output.
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