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Old 25th March 2014, 01:08 AM   #1
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Default Recommendations for a quality 'Off the Shelf' SMPS

I have recently received an Connexelectronic (PCBStuff) SMPS500Rv2. Aside from an initial issue with the fast-on spade connectors literally coming off the board, all seemed well. After a few hours of testing and use it has become mechanically noisy and though the output seems stable it runs hotter when making the noise. I have approached the company about this and await their recommendation on what to do about it. I'm a little disappointed in it as a result.

Can anyone recommend a quality SMPS that will output +/-45V (even if it has to be configured / adjusted to the desired output) in the 300W to 500W range? The Connexelectronic was a good price, but I'd be willing to pay more for a higher quality product. I know some have advocated the Hypex product and others the Coldamp product and am curious if there are others that come recommended.
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Old 26th March 2014, 12:13 PM   #2
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With the lack of recommendations I have looked about some and find three potential candidates:

Hypex SMPS400A180
Coldamp SPS30
AudioPower DPS-500/DA

Of these both Coldamp and AudioPower can customize the output voltage without added expense, though the Hypex is the least expensive of these.

Has anyone had direct experience with any of these or has any other recommendations? I have been in touch with Coldamp and got very prompt response, so for me that bodes well.
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Old 30th March 2014, 10:35 AM   #3
Cristi is offline Cristi  Europe
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Please send it back and willbe replaced or get refund. I aleady explained by mail why the connector might become lose.
Since you ask an alternative i can only recommend hypex ones the other two are either obsolete or too much praised using excessively amounts of pseudo science terms.
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Old 30th March 2014, 04:12 PM   #4
djdoru is offline djdoru  Europe
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A friend of mine bought SMPS300RE and quoting him, is the "best SMPS ever used for an amplifier" that can't be beaten nor by quality, price or performance. Smallest form-factor, highest efficiency, lowest noise and bullet proof safe. I dare to believe that the SMPS500R isn't that far either. I read some reviews on some french and german websites and these power supplies stand in front of others for the same reasons. It might be just you're unlucky or not careful enough that something came of and probably the rest of the problems just started there. I see that the vendor offered you replacement or refund, I think is fair enough and you should take the chance and let us know how it went. I plan to buy one SMPS2000R for my next First One project and I hope that will be up to my expectations.

Few years ago I bought one coldamp SPS30 for my Quad405 project and I was having a lot of problems with that until it eventually died with blown transistors and few other parts, making it unrepairable. Never got it fixed, they never answered to my emails not to mention about replaced or returned the money. I just gave up. Then I decided to build a robust linear supply which never had any issue. The first impression of SPS30 was an expensive, poorly designed, with lack of protections and extremely noisy power supply. I wouldn't recommend it to any of my friends.

Hypex SMPS's are good quality a little expensive and I find them an excellent match for their class D amplifiers and not only. But the lack of regulation of output voltage make them unsuitable for many applications. This is a point where I still believe that Connex electonic SMPS are superior.

Audiopower DPS-500/DA ? hmmm, doesn't inspire too much trust though. I gave a hope to them and I was about to order one for my project till I found one post on diysmps forum where someone dismantled one power supply and showed how was built. I find it as a "Coldamp reloaded" with contradictory informations and specks, flooding advertisement and annoying promotion made by the very single guy who promote them (and probably produce them in china too) and lack of positive feedback from neutral or trust able sources.
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Old 30th March 2014, 04:53 PM   #5
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Thanks for your input and suggestions. Yes, sometimes we have a spot of 'bad luck' with a product or service. Shame it had to be the first experience though.

I have emailed the vendor and have had one reply so far and await another response. Hopefully I can get this resolved satisfactorily. My current project is in a compact chassis, so a regular linear supply would be tight, though not out of the question. Size and perceived value is what drew me to the SMPS in the first place. Only issue is if something isn't right the typical DIY'er can't fix it. Live and learn.

Hm, I was beginning to lean towards the SPS30. Decent form-factor and the right power level for my needs. They have also been responsive to my contacts as well. Guess not everyone has the same experiences.

The only thing that keeps me from the Hypex is that LazyCat made a bunch of recommendations to modify it, largely due to inferior capacitors being used. I guess we can see that in many different products though. I just didn't want to buy something only to have to 'upgrade' it to get the best performance from it.

As far as regulation goes, I'm OK without firmly regulated rails. I just want decently low levels of ripple.
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Old 1st April 2014, 05:25 PM   #6
AP2 is offline AP2  Italy
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Quote:
Originally Posted by djdoru View Post
A friend of mine bought SMPS300RE and quoting him, is the "best SMPS ever used for an amplifier" that can't be beaten nor by quality, price or performance. Smallest form-factor, highest efficiency, lowest noise and bullet proof safe. I dare to believe that the SMPS500R isn't that far either. I read some reviews on some french and german websites and these power supplies stand in front of others for the same reasons. It might be just you're unlucky or not careful enough that something came of and probably the rest of the problems just started there. I see that the vendor offered you replacement or refund, I think is fair enough and you should take the chance and let us know how it went. I plan to buy one SMPS2000R for my next First One project and I hope that will be up to my expectations.

Few years ago I bought one coldamp SPS30 for my Quad405 project and I was having a lot of problems with that until it eventually died with blown transistors and few other parts, making it unrepairable. Never got it fixed, they never answered to my emails not to mention about replaced or returned the money. I just gave up. Then I decided to build a robust linear supply which never had any issue. The first impression of SPS30 was an expensive, poorly designed, with lack of protections and extremely noisy power supply. I wouldn't recommend it to any of my friends.

Hypex SMPS's are good quality a little expensive and I find them an excellent match for their class D amplifiers and not only. But the lack of regulation of output voltage make them unsuitable for many applications. This is a point where I still believe that Connex electonic SMPS are superior.

Audiopower DPS-500/DA ? hmmm, doesn't inspire too much trust though. I gave a hope to them and I was about to order one for my project till I found one post on diysmps forum where someone dismantled one power supply and showed how was built. I find it as a "Coldamp reloaded" with contradictory informations and specks, flooding advertisement and annoying promotion made by the very single guy who promote them (and probably produce them in china too) and lack of positive feedback from neutral or trust able sources.
Hi,
Please, you can show me the link of our DPS-500/DA dismantled??

Just for info (all know this),It is developped and assembled in Italy.
ColdAmp reloaded?? ColdAmp have a smps with this performances? and or technology? sorry but not know.
Our simple smps for audio is the DPS-400, It features performances by musical and cleaning that I do not seem to have other smps.
I do not know a DPS-400 broke.
The cost of production of 1 DPS-400 is equal to 2.7 times compared to a similar smps, you can see just by looking I think.
You have posted information that is not absolutely true.

"flooding advertisement and annoying promotion??"
Well, I need a TRUE clean and fast in response smps for our new project class A-B, Please... advise me a smps for this use, the price is not important, I just want to measure if I can use this, on my new amp.

regards

Last edited by AP2; 1st April 2014 at 05:33 PM.
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Old 1st April 2014, 05:44 PM   #7
AP2 is offline AP2  Italy
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Quote:
Originally Posted by Cristi View Post
Please send it back and willbe replaced or get refund. I aleady explained by mail why the connector might become lose.
Since you ask an alternative i can only recommend hypex ones the other two are either obsolete or too much praised using excessively amounts of pseudo science terms.
"Pseudo science...obsolete smps"??
I not have words....please, develop you for me, a smps regulated with fast response, clean,with no PWM. you know what is "PWM" I think.
and use 470uF max becouse 1600uF is illegal and catastrophic.
When you realizze this for me, I buy a lot.

Based on what? you recommend Hypex smps and decide that others are not good.
In this area (smps), which is very delicate, it takes the measurements, no words.
A company that saves on components of a smps is not worthy of selling.
convince me that you have a good smps ...

Last edited by AP2; 1st April 2014 at 05:57 PM.
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Old 1st April 2014, 06:06 PM   #8
AP2 is offline AP2  Italy
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Quote:
Originally Posted by jkuetemann View Post
With the lack of recommendations I have looked about some and find three potential candidates:

Hypex SMPS400A180
Coldamp SPS30
AudioPower DPS-500/DA

Of these both Coldamp and AudioPower can customize the output voltage without added expense, though the Hypex is the least expensive of these.

Has anyone had direct experience with any of these or has any other recommendations? I have been in touch with Coldamp and got very prompt response, so for me that bodes well.
2xDPS-400+2xPBTU3 (ELNA Filter 2x5000uF) at +/-45V or 36-58V 120 +ups.
from measures, the best is the DPS-400
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Old 2nd April 2014, 01:29 PM   #9
irribeo is offline irribeo  Netherlands
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''The only thing that keeps me from the Hypex is that LazyCat made a bunch of recommendations to modify it, largely due to inferior capacitors being used. I guess we can see that in many different products though. I just didn't want to buy something only to have to 'upgrade' it to get the best performance from it."

The way I perceived it, some people that bought or wanted to buy LC's VSSA amp did not want the Hypex because there were Samwha caps used. They read about bad Samwhas in the past or experienced bad Samwhas themselves. Either way they felt very strong about this. That was in my opinion reason for LC to look at replacing these, and when somebody like LC starts measuring into finding suitable replacement parts he is bound to find possible improvements too (for intended use).
So I don't think LC actually found the Samwhas to be inferior.

I still use the unmodded Hypex. I also use Cristi's connexelectronics500rs, same possitive experience with that smps, no problems (it also has Samwha caps).
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Old 2nd April 2014, 05:08 PM   #10
Cristi is offline Cristi  Europe
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Jason: did you sent the unit already ? I sent you another email and I got no reply at all.

Dj Daru: Please bring some proofs to support your affirmations, our colleague AP2 seems irritated by these affirmations. where you found that post ? I can't find any.

I recommended the Hypex ones because I trust their skills and quality. Although they are competitors (bigger than our company) I respect them and appreciate a good product. Not the same I can say about others who just claim to have a much better product in fact just vaporware. Hypex SMPS's have no regulated output voltage, while most of the ones we sell have. This doesn't make them useless. In exchange some of them use synch rectifiers, at the moment the only ones commercially available which I'm aware of. that's the reason of using such a small secondary side capacitance. anyway I will not enter in details, not many will fully understand the reasons and motivations. The story of bad caps is obsolete too. and using audiograde capacitors for a smps only proves that the smps was made to sqeeze more money not performance.
even your last post was advertisment: 2xDPS-400+2xPBTU3 (ELNA Filter 2x5000uF) at +/-45V or 36-58V 120 +ups. from measures, the best is the DPS-400
AP2: I read some of your posts and I have to admit that it worthed time spent. And yes I have developed (but not for you, unless you gonna get inspired from it) a smps regulated with fast response, clean,with no PWM.
I don't know what is PWM, sorry, pls explain with your own words.
Why I said that too much praised using excessively amounts of pseudo science terms ?
There are few threads where you had offered discounts, free boards, group buys and so on, and almost every time some of the members got tired of endless excuses why wasn't shipped couple of months later. let's be serious you're in the heart of Europe and there are no shipping problems like I face here in china where each day comes with new challenges.

"The smps integrated in this amplifier is unique in the world a this moment. like it or not, this is a truth!" AudioPower (DPA-400) Sound pressure improvements? I can make a list with several telecom, medical and even industrial SMPS which can perform much better. and in decent quantities, the prices are similar if not lower.
Revolution in A-B Class Amplifiers
Revolution in A-B Class Amplifiers

Please, respect forum users if you want to be taken serious. also, respect your competitors and don't think that everything else is trash. I do respect Hypex and I would respect any others which will do something at least at the same level of performance/price as I do or they do.
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