Jump to content

Low ripple&noise 12V switching power supply


Recommended Posts

Hi, I'm looking for an Australian seller / distributor of a 12V switching power supply, something like the Mean Well RS-35-12:

 

https://www.meanwell-web.com/content/files/pdfs/productPdfs/MW/Rs-35/RS-35-spec.pdf

 

But then with a ripple & noise closer to 10mVp-p. More or less W & A is fine. Does anyone know of such a power supply?

Link to post
Share on other sites


1 hour ago, Ian McP said:

Jan Didden's Silent Switcher

 

That is rather impressive! I will keep that in mind for other projects.

 

For this current project of mine, I should have been more clear. When I wrote "more or less W & A is fine.", I was hoping for the current range to be around the 0 ~ 3A mark like the mean well. 2A is minimum for me. This needs to power a eurorack system of about 300HP.

 

 

Link to post
Share on other sites
On 26/10/2020 at 11:06 AM, jleonne said:

 

The specification of that one mentions ripple&noise: 120mVp-p.

I'm looking for a much lower value, closer to 10mVp-p.

 

 

So why don't you use a linear PS, instead of a SMPS?

 

Andy

 

  • Like 2
Link to post
Share on other sites


I'm sure this is controversial to say, but I see evidence that switching is better than linear when you want minimal ripple/noise/hum. Large linear power supplies cause excessive audible hum in eurorack modules. EM from linear tends to detune VCOs. Let's just say I want switching. :)  Daitron claims to have switching supplies down to a mere 1mVp-p. It's very expensive though. They also have 10mVp-p versions, which are somewhat afforable, and I was wondering if there are any (cheaper) alternatives out there.

Link to post
Share on other sites
On 28/10/2020 at 10:56 AM, jleonne said:

 

I'm sure this is controversial to say, but I see evidence that switching is better than linear when you want minimal ripple/noise/hum.

 

 

That's not controversial - simply a tenet of belief by the 'how good are SMPSs! ' sect.  :winky:

 

My own experience is different.  I make the AKSA 'Paris' head amp - ie. a gain circuit which allows a LOMC cartridge (say, 0.3mV output) to be used into a MM phono stage (which expects a 5mV input signal).  It needs a 12v DC supply.

 

The latest one I made was a custom order - and required a lot more internal wiring than normal.  When I tested it out, after finishing the build, I was disappointed to hear an unacceptable level of HF hash coming from the spkrs.  My first thought was that I hadn't done a good-enough job of shielding the internal wiring - then I realised that this was the first time I had tried powering a Paris with a 12v (SMPS) wall wart.

 

Thinking that this must be the cause of the noise ... with a bit of reorganisation of my music system, I was able to use a 12v Sbooster LPS to power the Paris - in place of the 12v Meanwell SMPS.

 

Result ... absolute quiet - no HF hash (which is how a Paris normally sounds)!

 

Andy

 

Link to post
Share on other sites
2 hours ago, andyr said:

 I was disappointed to hear an unacceptable level of HF hash coming from the spkrs. 

Great to see a really specific, very concrete, audible report like that.  (As opposed to the more common subjective reports seen such as, "this power supply provides a lowered noise floor", or "a blacker sound", which could leave one in doubt. )

 

It's understandable that with a very low output cartridge even a very small amount of interference can become noticeable.  I guess the physical placement of power leads near the turntable could become critical - the further away the less likely to interfere.

  • Like 1
Link to post
Share on other sites
32 minutes ago, MLXXX said:

 

It's understandable that with a very low output cartridge even a very small amount of interference can become noticeable.

 

 

Naturally.  :)

 

32 minutes ago, MLXXX said:

 

  I guess the physical placement of power leads near the turntable could become critical - the further away the less likely to interfere.

 

 

There was no power cord "nearer the TT" when I used a 12v wall wart to power the Paris.  The only thing that was causing the audible HF hash - with the SMPS vs. the LPS - was the SMPS itself.

 

Andy

 

Link to post
Share on other sites


16 hours ago, MLXXX said:

 

It's understandable that with a very low output cartridge even a very small amount of interference can become noticeable.  I guess the physical placement of power leads near the turntable could become critical - the further away the less likely to interfere.

 

I found the same, in a vinyl-free setup. When dealing with the residual hash (ear against speaker drivers) I found that cable routing, plugging unused ports with shorts, using better shielded interconnnects, etc. made much more of a change than upgrading power supplies.

 

FWIW, and vaguely circling back to on-topic, I used LPS models from this series in the past with good success, sourced from RS:

https://docs.rs-online.com/20db/0900766b80a2ef74.pdf

 

They have very low R&N, but wouldn’t be powerful enough for the OP.

 

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    No registered users viewing this page.




×
×
  • Create New...