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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st May 2011, 11:01 PM   #1681
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Quote:
Originally Posted by alkasar View Post
There is not that much to say. I don't think anyone did a direct comparison.

Both smps will do the job. Connexelectronic one is much smaller, is more efficient and has an auxiliary power. You can get the Connex at the voltage you want.
I cant think of any other smps giving as much at this price
Thanks a lot. Seems like the way to go!

While we are talking supplies can there be any problems (electrical noise, etc.) with mounting them in the same enclosure as the amp boards are in? Especially if they are closely spaced to the amps?

Thanks,
Rod
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Old 22nd May 2011, 12:27 AM   #1682
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Quote:
Originally Posted by alkasar View Post
There is not that much to say. I don't think anyone did a direct comparison.

Both smps will do the job. Connexelectronic one is much smaller, is more efficient and has an auxiliary power. You can get the Connex at the voltage you want.
I cant think of any other smps giving as much at this price
Please someone correct me on this, but as far as I know:
- Meanwell SMPS are "older" tecnology, they have a switching frequency of about 25 kHz and less efficiency compared to the Connexelectronic
- Connexelectronic SMPS's are "newer" technology, they have a much higher switching frequency, somewhere around 100 kHz, and a much higher efficiency (90+%). It means that they require less cooling and are more reliable.
- Connexelectrinc PSUs are made with audio applications in mind, they have no active cooling, and are made by a guy present on this forum, called Cristi. He has a topic here: Switched Mode Power Supplies (SMPS)

But I don't know anything else, and I'm before purchasing my first Hifimediy kit and SMPS, so these points are only the result of internet research, they are not actual experiences.
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Old 22nd May 2011, 12:41 AM   #1683
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There's a photo earlier in this thread of my T1 Tripath amp installed in an all-aluminum case with a Connex SMPS500R-single. The two units were almost touching, yet I never heard interference.

A Connex power supply is twice as expensive as a Meanwell clone, but easier to install in a small case. The build quality seems higher, and the auxiliary power output is a nice extra. That said, a lot of people also report very good results using Meanwell knock-offs from E-Bay, so any differences in sound are probably minor (if they exist at all).
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Old 22nd May 2011, 12:59 AM   #1684
col is offline col  Australia
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I have several Meanwell SMPS that I have been using for audio projects since March 2008. After a couple of years the main power caps start to bulge. If you look inside the "brick" the design looks quite primitive. It's all on a single layer, through hole PCB that is quite thin. I don't think I will be getting more than 5 years out of one.

In comparison the ConnexElectronic SMPS250 I own looks much more advanced using dual layer thick PCB and SMD component, it's much more compact. Sound wise I don't hear any difference.
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Old 22nd May 2011, 01:07 AM   #1685
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Some good info here on the Meanwell vs Connexelectronics supplies. Looks to me like the latter should be well worth the price difference. $41-43 for Meanwell at HiFiMeDIY and $55 for the Connexelectronics for the supply linked earlier.

Thanks for the postings.

Rod
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Old 22nd May 2011, 03:03 AM   #1686
Donka is offline Donka  United States
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Quote:
Originally Posted by col View Post
I have several Meanwell SMPS that I have been using for audio projects since March 2008. After a couple of years the main power caps start to bulge. If you look inside the "brick" the design looks quite primitive. It's all on a single layer, through hole PCB that is quite thin. I don't think I will be getting more than 5 years out of one.

In comparison the ConnexElectronic SMPS250 I own looks much more advanced using dual layer thick PCB and SMD component, it's much more compact. Sound wise I don't hear any difference.
Really, do you know which model on the MW psu? I have used MeanWell open-PCB and DIN mount supplies for control pursposes and they all lloked more sophisticated than the stuff I normally see in audio, besides the Coldamp supplies. No failures on my side, yet they may be less taxed than one used as an audio supply and pushed commonly at its limits.
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Old 22nd May 2011, 03:13 AM   #1687
Donka is offline Donka  United States
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So what is the word on the newer T3 and TA3020 Hifimediy amps?? While I hear many positive things about the the TA3020 I have not found any reviews of the Hifi implementation of this chip. It seems if the ST-517B stage is good that the separate monoblock layout of the T3 may possibly produce better sound, with supply caps being separated off the board as well. I am looking to use these for active 3-ways, along with some T1 or T2's for the TM components.

Also has anyone compared the HiFi boards to the Sure v4 or the 41hz Amp2 or Amp8. I read 41hz is now using better output stages on the 2 and 8 instead of the older ST chips used on the HiFi. Has anybody swapped and/or heard these newer FET's, and any comments.

Thanks
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Old 22nd May 2011, 04:26 AM   #1688
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Quote:
Originally Posted by Donka View Post
Really, do you know which model on the MW psu? I have used MeanWell open-PCB and DIN mount supplies for control pursposes and they all lloked more sophisticated than the stuff I normally see in audio, besides the Coldamp supplies. No failures on my side, yet they may be less taxed than one used as an audio supply and pushed commonly at its limits.
Quite a few of the cheap Meanwell power supplies sold on E-Bay appear to be copies containing less expensive components. Maybe you were using genuine retail Meanwell units?
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Old 22nd May 2011, 05:52 AM   #1689
Cristi is offline Cristi  Europe
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The main difference between the SMPS300R and various meanwe11 power supplies is the topology used, LLC resonant converter, which generate much less EMI, and has at least one fold efficiency increase (over 90% compared with around 75-80% the mw ones) that's why some peoples reported at least the same performances of any SMPSx00R series open frame, unshielded compared with bullet proof shield found on most Meanwell power supplies.
The genuine Meanwell power supplies are superior quality than the ones found for sale on various locations, but they come price tag significantly different than the first ones. yet, for the brick ones, the technology is not much different, they are based on the same classic schematic which was used in most of the ATX power supplies from late 1980's till recent knock-off 5 usd silver box ATX power supplies. TL494 controller, driver transformer and 2 bipolar transistors most often with generic name 13007. the switching frequency is low, around 22-30KHz and requires heavy EMI filtering to not become an RF jammer. The cheaper ones, non-genuine are the result of the tight competition between various "manufacturers" where the low cost is the main target. they had to find any possible mean to bring the cost down otherwise they might vanish from the market. this mean a poor or non-existing R&D department to save cost, ripping an existing design instead, use the cheapest possible components, some of them with inferior quality, and/or fake markings (13009 instead of 13007), use a bare iron toroid on EMI filters and wound the transformer using aluminium wire instead copper (is 4-5 times cheaper and requires just 1.5 times more section) solder the pcb's with lead instead solder alloy, and many others. they can be found under various brands such as Meanwe11 or Me@nwell or whatever, the logo is almost identical just a small difference in the spelling to not be claimed as a clone.
A while ago i met somebody in the electronic market who bought 100 pcs of such power supplies at a ridiculous low price and he asked the seller to not apply the stickers cuz later he will apply other stickers identical with the genuine power supplies, and sell them as original.
Somewhere on their website, meanwell had a notice which warn customers about existence of these power supplies and some simple steps to identify them.
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Old 22nd May 2011, 03:48 PM   #1690
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Cristi is right.
I don't know much about topology and stuff, but at work, i noticed that some machines have meanwell psus in them. Like this one. And beleive me, that machine costs a LOT, so i'm pretty sure that genuine mean well is top notch quality.
Only problem with mine is: it's too big
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