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I recently got a used Acoustic Plan Digimaster Tube DAC which uses a 15V / 2A DC input with a 2.1mm connector. Acoustic Plan makes an optional Linear Power Supply called Powermaster. Three reviewers agree that this upgraded power supply offers sound quality improvements unfortunately a new one is $2000 which is above my budget. Paul Hynes can modify his S4 model to the correct voltage and Mojo Audio can also supply a modified Joule v5.0. Both are in the $600 - $700 range. The Paul Hynes unit is less until all the shipping & handling fees are added (~$120). The Mojo Joule v5.0 is factory refurbished. KECES also makes a 15v model in this price range. There is currently a Powermaster on Audiogon but it is still more than I want to spend for a 5+ year old unit.
1. Is there anything about these three options - Hynes vs Mojo vs KECES - that would make one clearly preferable to the other?
2. There are other options in the ~$370 - $500 range such as: Teddy Pardo, Accubasston Steady, etc.
3. In addition to clean power specs, would there be other aspects of a linear power supply that is built specifically to match components built by the same manufacturer that another brand will not have? The Acoustic Plan Powermaster can drive two of their components instead of just one but I do not foresee that I would use their Phono or CD products so I only need to drive their DAC.
Thanks
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A boutique power supply will give you totally awesome bragging rights.
But if all you need is pure clean linear regulated power then pick up a used Acopian B15G200 on eBay for $55 - $65.
The A15MT300 will give you a little more headroom and has tighter specs for a little more. You can also order new for a lot less than $500.
Acopian power supplies are made for 24/7 industrial use and will outlast any electronics you plug them into. You will need to make your own connector and power cord but that is super easy.
(https://www.acopian.com/images/pic9a.jpg)
(http://www.audiocircle.com/image.php?id=176467)
Acopian has other models to choose from
https://www.acopian.com/power-supply-voltages/15-volt-power-supplies.htm?search=15 (https://www.acopian.com/power-supply-voltages/15-volt-power-supplies.htm?search=15)
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I can only comment on the Hynes power supply. I had a 12v 3a unit that sounded superb with everting I plugged it into. The Sbooster linear power supplies are getting some good press. They are in the <$400 range.
https://www.sbooster.com/
https://www.sbooster.com/usa-resellers
https://www.youtube.com/watch?v=L_i8UTa4rw4
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Tough part is the 2A which sounds awfully power hungry for a dac. I have my doubts about that but if accurate your choices are pretty much what's been stated.
Oh it has tubes. Hm.
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Here's a good budget option below. Very low noise. Discrete components. Pretty serious build. Says it's good for 1A continuous and higher peak currents. If the DAC has 2A listed this means the actual current draw should be a lot lower.
https://www.ebay.com/itm/100VA-Ultra-low-Noise-100W-LPS-R-core-Linear-power-supply-DC-5V-24V-With-display/131867485038?hash=item1eb3ea236e:g:MzMAAOSwWWxY-A~u
If the stock PS for the Digimaster is indeed an SMPS as the website states then pretty much ANY linear power supply, like the Acopian mentioned, will be a step up in sound quality.
Here's another:
https://www.ebay.com/itm/Finished-65VA-Ultra-Low-Noise-linear-Power-supply-5V-9V-12V-15V-18V-etc/121970182193?hash=item1c65fd4831:g:VCsAAOSwT6pV3oqJ
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The concern I have is how low is the noise level? Very seldom do you see scope data. Regulators and circuit quality can make or break power supply output. Stable voltage is one thing and low noise another. Does the unit deliver both?
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The concern I have is how low is the noise level? Very seldom do you see scope data. Regulators and circuit quality can make or break power supply output. Stable voltage is one thing and low noise another. Does the unit deliver both?
Which unit?
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The Acoustic Plan DAC uses four EC86 tubes. Also, I am more inclined toward power supplies that are built for audio applications as opposed to those for industrial or scientific use just because there may be more involved than just specs - (this is my feeling even though I know nothing about electronics).
Has anyone had experience with the Mojo Audio power supplies, the newest model is Illuminati and the previous is the Joule v5.0?
One manufacturer mentioned that a unit with slightly higher amperage (3A vs 2A) would be okay because the DAC will only draw what it needs. What about voltage e.g. 16V vs 15V?
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I would adhere to the 15v specified by the manufacturer. Amperage has some wiggle room, but I wouldn't mess with the voltage if there are tubes involved.
The Powermaster appears to be a well built but typical 15v regulated power supply. I don't see anything about it that warrants $2000, at least based on the pic below.
(http://www.audiocircle.com/image.php?id=176499)
The power supply search is a rabbit hole. If you want the very best then just get the Hynes or perhaps an Uptone. Not a tube expert, but if there are tubes in the output then I think ultimate lowest noise floor is not as crucial and any of the <$400 options will suffice.
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Power Supply (8+) Group Test, LPS and SMPS
https://www.computeraudiophile.com/forums/topic/31119-power-supply-8-group-test-lps-and-smps/
(https://www.computeraudiophile.com/uploads/monthly_2017_03/PSU03.png.77431fcf80ccacb6944a7de28bf1342b.png) (https://www.computeraudiophile.com/uploads/monthly_2017_03/PSU03.png.77431fcf80ccacb6944a7de28bf1342b.png)
My Conclusions
I hope the translation was not too difficult to read :)
To help the readers here, I have put together a scoring system (our of 100, IMHO) and a few conclusions:
1. 95 Nanfu 9V alkaline battery
2. 93 iFi iPower 9V SMPS
3. 90 ZERO-ZONE SUPER-PSU
4. 80 TeraDak TeraLink X2
5. 65 Breeze Audio DC-1 / S.M.S.L Panda dual 9V (both flawed)
6. 55 Apple charger
7. 50 Xiaomi 10040mAh battery bank
The best is the 9V battery (not surprised).
The SMPS based iFi iPower is so close to the battery was a surprise.
Many LPSs didn’t do well at all was another surprise.
LPS is NOT guaranteed to have good performance, need to pick very carefully too, e.g. Zero Zone will be a good one.
SMPS is generally not as good as LPS except the iFi iPower, which has better performance than the LPS.
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You will still want the lowest noise power supply, regardless of whether the unit is tube or solid state ... especially with small signal tubes which can be a *very* low noise application.
Although I prefer linear supplies for some applications, I must admit that the switch mode supplies available today and not necessarily designed specifically for audio applications can offer extremely low noise. The key of course is selecting an known good unit.
Perhaps more importantly, though, is that such a well selected switch-mode supply will not have the 60Hz line frequency and it's harmonics (120, 180 Hz etc) as noise, which is something a linear supply can minimize but never eliminate. Especially for small current applications (under 3A and 24V) the options in the market are quite attractive, and offer lower noise than linear alternatives.
If the recommended current is known (it appears it is in your case) then I would not choose a supply that cannot reliably meet that current demand without voltage sag. You can safety use a supply that is capable of higher current (but keep voltage to spec), as it was mentioned by someone here, it will only use the current it actually needs.
Regardless, there is absolutely no justification for the prices quoted in this post. I can see $500 for a retail price for a finished, bricks-and-mortar limited distribution supply unit in a nice retail box. For a direct-to-consumer marketing model, I would expect to see $100~200 less (not including shipping).
I am a DIY'er so I would simply build one, and it would not cost me much more than $100 in parts with nice cosmetics, and quite possibly less. It would not be my first power supply build.
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Power Supply (8+) Group Test, LPS and SMPS
https://www.computeraudiophile.com/forums/topic/31119-power-supply-8-group-test-lps-and-smps/
(https://www.computeraudiophile.com/uploads/monthly_2017_03/PSU03.png.77431fcf80ccacb6944a7de28bf1342b.png) (https://www.computeraudiophile.com/uploads/monthly_2017_03/PSU03.png.77431fcf80ccacb6944a7de28bf1342b.png)
The iFi 9V 2A really has 2 Amps of ripple? The Apple 5V 1A has 1 Amp of ripple?
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Talking about DIY, Aleksandar (ATL Hi-Fi) sells a modified Sulzer regulator, ensambled or only PCB.
https://www.atlhifi.com/shop/populated-pcb/modified-sulzer-regulator-assembled-and-tested/
https://www.ebay.co.uk/itm/Modified-Sulzer-regulator-mini-version-fully-assembled-and-tested/131821456029?hash=item1eb12bca9d:g:bXcAAOSwrnNXP1w3
Regulator's measured performance with output voltage 15V, 40 Ohm load (375 mA load current):
[Big IMG] https://www.atlhifi.com/wp-content/uploads/2017/10/2j1ofo1.jpg
For the tests was used a 35VA toroidal transformer with two secondary windings; souncard used - E-MU 0404.
The regulator is offered with the following standard output voltages: 9V, 12V, 15V, 18V, 24V.
Make sure to inform me for correct output voltage immediately after purchase.
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Ripple is always voltage,
iFi 9V with 1A only has 0.15uV (ripple). And is cheap.
The cheap SMPS from Asia are very noisy and add noise to mains. Its proliferation is one of the causes of the electrical network having so much noise at present.
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Here is a link that shows the inside of the Powermaster and can be enlarged to full screen for very good detail. Other than the fact that it is two power supplies in one enclosure - is there anything that unusual about it? I have no doubt that Acoustic Plan does use high quality parts but I'm other manufacturers do as well.
https://www.hifistatement.net/tests/item/1735-acousticplan-digimaster-drivemaster-und-powermaster?start=4#prettyPhoto/0/
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The more important thing -with low power- is the regulation quality and not the number of little transformers.
How many ripple? Measures?
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Which unit?
any unit for sale without data showing noise floor. John Curl is considered the father of low noise audio circuits. He uses multiple stages of regulation with components he has measured. Carl Thompson does the circuit layout. Carl was a designer for Grass Valley Group. They are a television production equipment manufacture.
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Here is a link that shows the inside of the Powermaster and can be enlarged to full screen for very good detail. Other than the fact that it is two power supplies in one enclosure - is there anything that unusual about it?
It's just a typical regulated power supply.
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Thanks for taking a look at it. That is the information I wanted about the Powermaster specifically. Based on others comments on this thread as well as other reading some sources do say that all switching power supplies are not automatically inferior to linear supplies. Some of the linear supplies suggested here at relatively low cost are likely worth a try. Based on more than 50 years of DIY projects – none in electronics - I have finally learned that I need to buy an off the shelf product. Thanks all for the education and for saving me some money.
During my internet searching I did come across a series of YouTube videos by Hans Beekhuyzen:
https://www.youtube.com/channel/UCR4tuhqPppVp-PD0q17sPEA and http://www.thehbproject.com/en
These were more understandable for me than many other semi-technical explanations of digital audio.
I still wonder if anyone has heard much about the Mojo Audio power supplies.
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Thanks for taking a look at it. That is the information I wanted about the Powermaster specifically. Based on others comments on this thread as well as other reading some sources do say that all switching power supplies are not automatically inferior to linear supplies. Some of the linear supplies suggested here at relatively low cost are likely worth a try. Based on more than 50 years of DIY projects – none in electronics - I have finally learned that I need to buy an off the shelf product. Thanks all for the education and for saving me some money.
During my internet searching I did come across a series of YouTube videos by Hans Beekhuyzen:
https://www.youtube.com/channel/UCR4tuhqPppVp-PD0q17sPEA and http://www.thehbproject.com/en
These were more understandable for me than many other semi-technical explanations of digital audio.
I still wonder if anyone has heard much about the Mojo Audio power supplies.
The Mojo throws a lot of splashy verbage around. I don't have a problem with that typically, but it's a bit much here: "From our unique low-resonance polymerized aluminum composite chassis, to our multi-stage ultralow-noise ultrahigh-dynamic filtering, to our self-resetting protection circuitry, there is nothing that compares."
Mmkay, great. So based on the pic it looks like the Mojo is a combo of choke filtering and a ~$50 low noise Belleson regulator with boutique caps. Looks like a solid design. Certainly much better than the Powermaster. Is it worth $1000? For some, maybe.
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Mojo can modify a factory reconditioned Joule v5.0 dual voltage model to 15V for $600. The Joule has recently been replaced by the Illuminati.
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Ripple is always voltage,
iFi 9V with 1A only has 0.15uV (ripple). And is cheap.
The cheap SMPS from Asia are very noisy and add noise to mains. Its proliferation is one of the causes of the electrical network having so much noise at present.
Exactly. Thus I quoted his values and asked for clarification (I already knew they were incorrect). And that introduces the question as to whether any of the data in that chart is correct.
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People are very satisfied with the iFi iPower.
https://ifi-audio.com/portfolio-view/accessory-ipower/
Tech specs:
5V/2.5A; 9V/2.0A; 12V/1.8A; 15V/1.2A
Noise*: 1uV
* Average audio band noise floor
or beatiful Line Power like:
Zero-Zone super-psu 30va 5V, 9V, 12V ...
https://www.ebay.com/itm/ZEROZONE-SUPER-PSU-30VA-DC12V-1-3A-Linear-Power-supply-LPS-for-Audio-Sources-/321924706372?_ul=AR
[IMG] https://i.ebayimg.com/images/g/rboAAOSwT4lWTUOa/s-l1600.jpg
R-core transformer
MOSFET output
VISHAY BYV27 (2A) rectifier
Nichicon KG TYPE II file 3300U
Very good trimpots (blue)
case with thick walls.
...
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Exactly. Thus I quoted his values and asked for clarification (I already knew they were incorrect). And that introduces the question as to whether any of the data in that chart is correct.
The chart has the appearance of reporting, for each of the power supplies, measured ripple (in volts) for one or two measured current draws (in amps). Not really that difficult to understand, and fairly standard methodology for testing power supplies. Which values do you know were incorrect?
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iFi iPower “audiophile” wall-wart :(
https://forum.psaudio.com/t/ifi-ipower-audiophile-wall-wart/2582
https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Delectronics&field-keywords=ifi+ipower&rh=n%3A172282%2Ck%3Aifi+ipower
5V and 12V hummm...
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A boutique power supply will give you totally awesome bragging rights.
But if all you need is pure clean linear regulated power then pick up a used Acopian B15G200 on eBay for $55 - $65.
The A15MT300 will give you a little more headroom and has tighter specs for a little more. You can also order new for a lot less than $500.
Acopian power supplies are made for 24/7 industrial use and will outlast any electronics you plug them into. You will need to make your own connector and power cord but that is super easy.
(https://www.acopian.com/images/pic9a.jpg)
(http://www.audiocircle.com/image.php?id=176467)
Acopian has other models to choose from
https://www.acopian.com/power-supply-voltages/15-volt-power-supplies.htm?search=15 (https://www.acopian.com/power-supply-voltages/15-volt-power-supplies.htm?search=15)
Man, I use Acopian power supplies a lot in my design prototyping efforts at work (can't use them in the final product, usually, as I design electronics for spaceflight applications)... but somehow never considered trying them out in my home audio setups! Might have to give this a shot... they are extremely reliable, well-built, and usually very low-noise.
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Re: DAC that will kill $6000 commercial DAC's for under $500
http://www.audiocircle.com/index.php?topic=155886.msg1668768#msg1668768
https://www.google.com/search?q=digikey+ac+dc+15v+converter+ultra+low+noise+medical
Sanken HWB030D-15
https://www.digikey.com/product-detail/en/sanken/HWB030D-15/HWB030D-15-ND/4486054
https://www.allegromicro.com/~/media/Files/Sanken/HWB-Series/HWB030D-15-Test-Data.ashx?la=zh-CN&hash=4A0AEB4A837C01E997CCF24747077BEF4235AE18
Features and Benefits
• Ripple noise: less than 5 mV P-P
• Conduction noise: lower than Class-B of CISPR by 20 DdB
• Radiation noise: Complies with Class-B of CISPR
• Leakage current: 50 μA or less for medical use
• Safety mark for medical use: EN60601-1 3rd edition
• Safety standards: UL1950, CSA950, EN60950, and CE marking
• World-wide input range
• Parallel operation
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What luck... this thread popped up at the same time I was looking for a power supply for my modem/router.. After reading this thread, one mentioned ZeroZone on eBay.. I need a 12 volt 3 amp unit.. I found ZeroZone and he didn't have one listed for my specs.. I contacted him and asked if he had one for me and he pointed out a 15 volt 3.5 amp unit.. I know the amp rating is ok but is the 15 volt, which is 3 volt more than I need, going to be ok ? Another post said to be cautious for voltage matching.. Or was that just for tubes ?
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I know the amp rating is ok but is the 15 volt, which is 3 volt more than I need, going to be ok ?
No, 25% over-voltage is asking for trouble. There are plenty of 12VDC / 3A - 5A linear power supplies available on eBay.
https://www.ebay.com/itm/ZEROZONE-100VA-12V-Ultra-Low-Noise-LPS-HI-END-Linear-Power-Supply-for-Audio/122554983852?hash=item1c88d8a5ac:g:98IAAOSwzvlW96K~ (https://www.ebay.com/itm/ZEROZONE-100VA-12V-Ultra-Low-Noise-LPS-HI-END-Linear-Power-Supply-for-Audio/122554983852?hash=item1c88d8a5ac:g:98IAAOSwzvlW96K~)
Here's a dual supply that can power two devices
https://www.ebay.com/itm/50VA-50VA-HIFI-Linear-power-supply-2-Way-LPS-DC-5V-9V-12V-15V-18V-19V-24V/122581492167?hash=item1c8a6d21c7:g:m-gAAOSw3YJZWfqN
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Thanks srb... Funny though, why would ZeroZone point me in the wrong direction ? Maybe he's just a retailer and don't actually make them.. I guess I'll buy one from him anyway..
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my bad... retailer.. buying same unit from different seller
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More about iFi iPower :nono:
Measurements of Sonore microRendu Streamer
https://audiosciencereview.com/forum/index.php?threads/measurements-of-sonore-microrendu-streamer.577/
[IMG] https://audiosciencereview.com/forum/index.php?attachments/usb-versus-microrendu-with-ifi-power-supply-png.2153/
[IMG] https://audiosciencereview.com/forum/index.php?attachments/microrendu-with-lab-supply-png.2154/
Summary
The combination of Sonore microRendu and ifi iPower is not good news. Performance is significantly degraded by injection of AC mains input of 60 Hz and its harmonics.
If you are going to use microRendu, then you should opt for a power supply like the SBOOSTER that has measured system performance that demonstrates its performance in this system. Once there, this device is useful from functionality point of view in allowing the DAC to sit remotely on a network. From audio performance point of view, the measurements do not show any improvements.
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Audio Ramblings - The Auralic Aries and SBooster Linear Power Supply
https://positive-feedback.com/audio-discourse/audio-ramblings-the-auralic-aries-and-sbooster-linear-power-supply/
(https://positive-feedback.com/wp-content/uploads/2015/11/b_850_0_16777215_10_images_content_tests_15-06-05_auralic_2015-05-28_Sbooster-BOTW_006.jpg) (https://positive-feedback.com/wp-content/uploads/2015/11/b_850_0_16777215_10_images_content_tests_15-06-05_auralic_2015-05-28_Sbooster-BOTW_006.jpg)
(https://markgrant.co.uk/489-thickbox_default/sbooster-15-16-volt-linear-power-supply.jpg) (https://markgrant.co.uk/489-thickbox_default/sbooster-15-16-volt-linear-power-supply.jpg)
(https://positive-feedback.com/wp-content/uploads/2015/11/b_850_0_16777215_10_images_content_tests_15-06-05_auralic_2015-05-28_Sbooster-BOTW_004.jpg) (https://positive-feedback.com/wp-content/uploads/2015/11/b_850_0_16777215_10_images_content_tests_15-06-05_auralic_2015-05-28_Sbooster-BOTW_004.jpg)
https://www.sbooster.com/botw-pp-eco-15v-16v/?page=all
https://markgrant.co.uk/power-supplies/297-sbooster-15-16-volt-linear-power-supply.html
Product highlights:
Power saving design.
2 characteristics in 1 product.
Power for high current demanding equipment.
Precision for noise sensitive equipment.
Two switch selectable output voltages; 15 volt and 16 volt.
Accessory setting which provides extra voltage for the optional Sbooster Ultra.
IEC 14 power inlet connector for high-end mains cables.
High performance dual stage mains filter.
Earth line choke.
Over voltage protection. <- black varistor
Custom made high efficient audio grade transformer.
High quality polypropylene film capacitors.
Improved low noise SBooster split current system.
The BOTW P&P ECO is available in 11 different output voltages.
http://hifipig.com/sbooster-best-of-two-worlds-power-precision-eco-botw-power-supplies/
http://www.standardcandle.org/2017/04/03/sbooster-botw-pp-eco-review/
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Maty, thank you for all the input. The SBooster was well regarded by a member on a recent Audiogon forum.
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The problem, I think, is the high price in USA.
By the way, xrk971, some hours ago in Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier thread:
http://www.diyaudio.com/forums/solid-state/318102-aksa-lender-mos-hybrid-aleph-alpha-amplifier-post5360011.html
Hi Hugh,
Yes, the Alpha 20 is now my main amp. 20 Watts would have been seen as wanting for more on some amps, but for some reason, it seems to be perfectly good here. Well I will have to do a revaluation once I get the 52w Big Boy going, big for now, I am able to put the other amps on the shelf and leave this one as primary. I think the combination of superior spatial imaging, clarity, resolution, and bass authority makes this amp a keeper. Seems to work quite well with conventional 400VA 18v toroidal trafo and CRC 33mF 0.235R 33mF shared with two channels then another 0.235R 33mF RC for each channel independently (F6 stereo PSU).
My SMPS seems to not be able to keep up without being stressed at the currents we are talking about here. I was running the DC step up at 29v to make 24v after the cap Mx and so that was 29/24x1.3ampsx2/0.9=3.4amps. Seems within 5amp rating but the smps supply seems to have more noise when pushed this hard. I might try again later with a good common mode choke filter. For now, just use the trafo and linear supply.
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I think is better idea to build/comission a PSU with very good regulation + common choke + Schaffner RF/EMI FN9244B 1A filter inlet + varistor + fuses + 1mm steel box.
With Sulzer regulator from ATL Hi-Fi
https://www.atlhifi.com/shop/bare-pcb/pcb-for-modified-sulzer-regulator-v-2/
(https://www.atlhifi.com/wp-content/uploads/2016/02/DSC01524-1-e1456759226410.jpg)
Modified Sulzer Regulator – assembled and tested
https://www.atlhifi.com/shop/populated-pcb/modified-sulzer-regulator-assembled-and-tested/
(https://www.atlhifi.com/wp-content/uploads/2016/05/DSC03497-1.jpg)
or with the new and very good LT3402... from 5V or more.
http://www.linear.com/product/LT3042
(http://cds.linear.com/image/32533.png)
Like this module:
0.8uV Ultralow noise DAC power supply regulator +-9/12/15V 1.5A*x2
http://www.diyinhk.com/shop/audio-kits/88-08uv-ultralow-noise-dac-power-supply-regulator-91215v-15ax2.html
(http://www.diyinhk.com/shop/322-thickbox_default/08uv-ultralow-noise-dac-power-supply-regulator-91215v-15ax2.jpg)
Feature:
1) Linear Technology 0.8uV ultralow noise LT3042 regulator
2) +-9V/12V/15V 1.5A* output switchable with a jumper easily. Please notes 1.5A is the burst value, please read the bottom notes for output usage larger than 0.5A continuously.
3) Panasonic EEUFC low ESR 5600uF capacitor and the red WIMA film capacitor are sourced from authorized distributor Arrow Electronics directly (guarantee no fake product from China)
4) The PCB follows the official demo circuit for ultimate performance.
5) Compact size 60mm x 90mm
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Re: How to clean the DC at mains. And ripple too.
http://www.audiocircle.com/index.php?topic=153802.msg1644542#msg1644542
Schaffner F9244B:
[IMG] http://maty.galeon.com/WP-imagenes/hard/IEC-inlet-filter-Schaffner-FN_9244-specs.png
[IMG] http://maty.galeon.com/WP-imagenes/hard/IEC-inlet-filter-Schaffner-FN_9244-typical-filter-attenuation.png
[IMG] http://maty.galeon.com/WP-imagenes/hard/IEC-inlet-filter-Schaffner-FN_9244-cicuit.png
Würth 150 kHz ferrite
[IMG] http://maty.galeon.com/WP-imagenes/hard/Wurth-150-khz-ferrite-impedance-curve.png
Or to build a DIY power cable (unshield) like:
[IMG] http://maty.galeon.com/WP-imagenes/hard/cables-Schaffner-filter-Wurth-ferrite-150Khz-IEC-C13-Schurter-from-ATL.jpg
with Schurter IEC off course.
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Build a Linear Power Supply for the Mytek Brooklyn DAC.
https://www.computeraudiophile.com/forums/topic/28056-linear-power-supply-for-brooklyn-which-one-youve-ever-tried/?do=findComment&comment=712185
(https://www.computeraudiophile.com/applications/core/interface/imageproxy/imageproxy.php?img=https://ufqhea-db3pap001.files.1drv.com/y4mli0Zk7DdiUcIAA4qlRyNmLnaLzA8U6byADyTLUhtPiEta-bE2a6kc9txnTjC40_9nswpYF6P2_It5I8doX_jWd5CtDHpVgeZ_37LjEG6jWhcoSZS_xSF0nMRo_IA1XIc6_VEHHjUEb8R_KZUIUyLW3j6oxzXfMaYqp3N_WFoWO6NqucF-F8wl2W2nNNmNVB84yWzrOfBv4WlaSJUaH6Tvg?width=800%26height=486%26cropmode=none&key=4be1a48e4fb4287edd619487ec32ebbf8dfb04bd9313be0a8f3c9f89df89be49)
Overall measurements:
0-100kHz ripple: ~ 5µV rms
0-100kHz noise: -106dBV
0-20kHz ripple: 2,2µV
0-20kHz noise: -112dBV
50Hz ripple not measurable!
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P-8 Linear Power Supply
http://keces-audio-usa.com/products/P-8
(http://keces-audio-usa.com/image/cache/catalog/Keces_P-8_3-1140x720.jpg)
$599.95, without measures or graphs.
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JS-2 Linear Power Supply
[Big IMG] https://cdn.shopify.com/s/files/1/0660/6121/products/JS-2_interior_master.JPG
Only $ 925.00, without measures or graphs.
The chinese Zerozone super-psu + mods/adds or a DIY with Sulzer or LT3402 are better choices to me.
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I've just done some preliminary measurements on a DAC that has a switchmode supply and the audio measurements are astonishly good. I can't help feeling that adding $$ linear PSUs without knowing what exacvtly it might improve is just stabbing in the dark (while burning money).
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If the DAC has inside a very good regulation then you do not need a great external PSU.
Which DAC?
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$249. 5V.
Review and Measurements of Topping D50 DAC
https://audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-topping-d50-dac.2403/
The new DACs have better internal regulation. Expected is the widespread use of LT3402.
I am waiting the measures and graphs of RME ADI-2 DAC and RME ADI-2 Pro.
http://www.rme-audio.de/en/products/adi_2-dac.php
http://www.rme-audio.de/en/products/adi_2-pro.php
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I doubt that you will be disappointed with the RME measurements. I have to say that I'm not entirely convinced by the output spectra (of the D50) at your link tho. Anyway that isn't related to this thread.
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RME ADi-2 DAC, in the box you can see the big SMPS.
[IMG] https://s5.postimg.org/p3y819x6v/9_B67374_F-56_CC-4_DEC-9_F95-0_AB5_A640_D700.jpg
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Well, technology advances! I can only assume that RME have specified the supply fairly precisely, altho it certainly doesn't look like much.
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In late March KECES will replace their DC-116 with a new model, the P3, which will be ~$350.
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I've just done some preliminary measurements on a DAC that has a switchmode supply and the audio measurements are astonishly good. I can't help feeling that adding $$ linear PSUs without knowing what exacvtly it might improve is just stabbing in the dark (while burning money).
Absolutely, that is why it is so hard. I have three reviews that say the linear power supply improves the sound quality of my Acoustic Plan Digimaster DAC but most do not say it brings it to a whole new level. The good thing is that some LPSU manufacturers do offer a trial period after which the their unit can be returned so I would just be out the shipping. This option may very well dictate which ones I try.
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No amount of speculation will beat listening for yourself and comparing. All the resellers should have 30 day return policies. If there’s no perceptible increase in sound quality just return the supply.
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True, but I'm not sure I see how a liberal return policy justifies taking leave of reason either. $2000 for an add-on supply to a device that has umpteen internal supplies (some of them most likely switch mode) derived from that seems, well, kinda crazy.
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True, but I'm not sure I see how a liberal return policy justifies taking leave of reason either. $2000 for an add-on supply to a device that has umpteen internal supplies (some of them most likely switch mode) derived from that seems, well, kinda crazy.
I agree. The pricing for some of these is nuts.
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About the RME ADi-2 DAC
[PDF] https://www.rme-audio.de/download/adi2dac_e.pdf
(http://maty.galeon.com/WP-imagenes/hard/RME-ADI-2-DAC-PDF-power-supply.png) (http://maty.galeon.com/WP-imagenes/hard/RME-ADI-2-DAC-PDF-power-supply.png)
Measures and graphs: page 53, 54...
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With LT3045.
http://www.linear.com/product/LT3045
(http://cds.linear.com/image/36854.png) (http://cds.linear.com/image/36854.png)
Features
Ultralow RMS Noise: 0.8μVRMS (10Hz to 100kHz)
Ultralow Spot Noise: 2nV/√Hz at 10kHz
Ultrahigh PSRR: 76dB at 1MHz
Output Current: 500mA
Wide Input Voltage Range: 1.8V to 20V
Single Capacitor Improves Noise and PSRR
100μA SET Pin Current: ±1% Initial Accuracy
FS: „Ultra Low Noise“ Power Supply, LT3045 based PCB’s
http://www.diyaudio.com/forums/vendor-s-bazaar/310402-fs-ultra-low-noise-power-supply-lt3045-based-pcb.html
[Big IMG] https://cdn.pbrd.co/images/GFLPErp.jpg
[Big IMG] https://cdn.pbrd.co/images/GFLRnIR.jpg
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I had forgotten the acquaintance AMB The σ22 (aka sigma 22) regulated power supply!
https://www.amb.org/audio/sigma22/
(https://www.amb.org/audio/sigma22/s22_assy.jpg)
Tech highlights
Low noise, high PSRR
A constant-current source feeds a zener diode as a stable voltage reference. A low-pass filter (with corner frequency of 1.6Hz) prevents zener noise from being introduced into the error amplifier. This is an effective yet lower-cost alternative to expensive voltage reference ICs. The low-pass filter also provides a soft-start characteristic.
The output noise (unloaded) is less than 10µV at ±30VDC output (measured using a Tangent LNMP (low-noise measurement preamplifier) and a Fluke 187 50000-count DMM in ACmV mode). The output noise is even less when the output voltage is lower. This is much better than the noise of an IC regulator based PSU tested under identical conditions.
The error amplifier is a discrete implementation of an opamp with a high open-loop gain of 102.5dB. The voltage supply to the error amplifier is isolated with capacitance multipliers to boost its PSRR (power supply rejection ratio). This greatly improves the line regulation performance of the PSU.
A long-tailed pair differential amplifier with current mirror and constant current source forms the first stage of the error amplifier. The second stage is the voltage amplification stage (VAS), also with constant current source load. The 3rd stage is comprised of the power MOSFET output devices configured as a source follower.
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The SilentSwitcher
https://linearaudio.nl/silentswitcher
The +/-15V linear regulators are fed by a dual switcher, working at a high frequency, so as to minimize radiated and conducted noise. Until recently this would not have been an option, but the linear post-regulators I selected have a PSRR of over 60dB at more than 1MHz! Absolutely incredible and exacty what is needed to clench what little ripple remains from the switcher. The 6/5/3.3 V source uses another dedicated high-frequeny switcher. It works in constant current mode into a relatively high decoupling cap and has low residual ripple.
I also put a lot of effort in designing the PCB to avoid excess radiation; very low impedance ground- and current paths, short traces, decoupling caps right at the source, etcetera, etcetera. More time went into that than into the circuit itself...
[Big IMG] https://linearaudio.nl/sites/linearaudio.net/files/connections%20final.png
[Big IMG] https://linearaudio.nl/sites/linearaudio.net/files/SilentSwitcherNoise.png
The +/-15V outputs of the linear post-regulators have 0.2uV (neg) and 0.02uV (pos) noise at 1kHz, and broadband audio band noise level of less than 40uV (neg) and 7.5uV (pos). That is impressive by any standard. (The baseline for the test amplifier is also shown).
[Big IMG] https://linearaudio.nl/sites/linearaudio.net/files/SilentSwitcher%20Zout.png
-> https://diyaudiostore.com/collections/kits/products/linear-audio-silent-switcher $89
(https://cdn.shopify.com/s/files/1/1006/5046/products/Silent-Switcher-15V_1024x1024.png)
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Verified, the RME ADI-2 DAC with a SMPS has very low noise <- super low linear regulators
Review and Measurements of RME ADI-2 DAC
https://audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-rme-adi-2-dac.2582/
Note also freedom of low-frequency noise below 1 kHz, indicating exceptionally clean supply (external wall-wart is switching by the way).
(https://audiosciencereview.com/forum/index.php?attachments/rme-adi-2-dac-residual-harmonic-distortion-vs-exasound-e32-measurement-png.11910/) (https://audiosciencereview.com/forum/index.php?attachments/rme-adi-2-dac-residual-harmonic-distortion-vs-exasound-e32-measurement-png.11910/)
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I've just done some preliminary measurements on a DAC that has a switchmode supply and the audio measurements are astonishly good. I can't help feeling that adding $$ linear PSUs without knowing what exacvtly it might improve is just stabbing in the dark (while burning money).
+1.
Best,
Anand.
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Linear Power Supply Unit L-100 €178 - €200 + shipping from Bulgary (EU)
https://www.atlhifi.com/shop/fully-assembled-devices/linear-power-supply-unit-l-100/
(https://www.atlhifi.com/wp-content/uploads/2018/12/20181026_165309-1-768x576.jpg)
Schematic description
The regulator has all-discrete topology. No Operational Amplifiers are used. This allows complete design control over all operating points and parameters for superior performance. Low noise, high PSRR.
There is a bridge rectifier block on the input which is filtered with a massive electrolytic capacitor on the output. This greatly reduce the ripple charge voltage and hence helps for better output filtering.
The error tracking stage is based on a differential amplifier built with dual transistors chip which ensures the excellent thermal stability and equality of its parameters.
The differential amplifier is cascoded which greatly reduce the input noise influence over the error (differential) amplifier and Erly effect.
A Zener diode is used as a voltage reference. It is fed by a Constant Current Source attached to the output of the regulator which dramatically minimise the noise and ripple through the Zener (and hence at the input of error amplifier). The High-frequency Zener noise is additionally filtered by a Low-pass filter between Zener diode and error amplifier.
The output stage consists of two power-Darlington bipolar transistors working in Common-Emitter mode. This allows the regulator to work as a LDO (Low-DropOut) with smaller difference between Input and output voltages which diminishes the thermal dissipation over the regulation transistors.
At the input of the regulation transistors is placed trigger-type overcurrent protection network which engages at a given output current and turns-off them. Once the protection is engaged, it can stay in this mode for an unlimited period of time which prevents the system from doing any harm even in a human absence. In order to returns to normal operational mode the regulator must be turned OFF for a while (to discharce the electrolytic capacitors) and then turned ON again.
And since SAFETY is a thing we care about a lot, a thermal switch is added in parallel with the overcurrent protection. This way even if the current protection is not engaged (which is almost impossible) the output regulation transistors will be turned OFF when their heatsink’s temperature reach 85°C.
Specifications
– Input voltage: AC 115V or AC230V (according to the destination country or user request)
– Output voltage: DC 12V/19V/24V (user-defined values are also available upon request)
– User selectable option for 8mm. aluminum front panel (black anodized)
– Dimensions: 220x220x75 mm.
– Transformer Power: 100VA
– Weight: about 4.5kg
– Output DC cable with barrel jack 5.5/2/5 mm. (OD/ID)
– Possibility for different output connectors upon customer’s request
– Built-in trigger-type overcurrent protection (in case of protection’s engagement the unit must be turned off for a while in order to recover its normal work)
– Built-in trigger-type overheating protection preventing the unit from burning in case of serious malfunction
– Common mode AC filter on the input of the AC supply voltage
– Front panel LED
Schematic description
The regulator has all-discrete topology. No Operational Amplifiers are used. This allows complete design control over all operating points and parameters for superior performance. Low noise, high PSRR.
There is a bridge rectifier block on the input which is filtered with a massive electrolytic capacitor on the output. This greatly reduce the ripple charge voltage and hence helps for better output filtering...
Measurements
Measurements of DC and AC voltages were taken with Keithley 2015 Multimeter while the spectrum plots were drawn using RTX 6001 Audio Analyser. The obtained results are as follows:
– Line regulation (AC input voltage between 216 – 235 V): 0.05%
– Load regulation (DC output current between 0 – 4.5 A): 0.06%
– Output AC ripple voltage when loaded with real load (Lenovo ThinkStation M92p): 4.2 mV RMS
– Measured Power Supply Rejection Ratio (PSRR): -120 dBV for fundamental harmonic (100 Hz)
And ALL the components from well-known shops like Digikey, Mouser and others trusted stores for professionals. ORIGINALS.
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To compare, a cheap chinese of 100VA too.
Finished 100VA 12V 6A Low Noise LPS Linear Power Supply with toroid transformer US $127 + shipping from China
https://www.ebay.com/itm/Finished-100VA-12V-6A-Low-Noise-LPS-Linear-Power-Supply-with-toroid-transformer/122728397679?hash=item1c932ebb6f:g:9uoAAOSw8aVZzGwR:rk:41:pf:0
[Big IMG] https://i.ebayimg.com/images/g/0WMAAOSwS1VZzGy1/s-l1600.jpg
Technical highlights
All-discrete topology.
Single-pass, series regulator design.
No IC (integrated circuits) are used. This allows complete design control over all operating points and parameters for superior performance.
Low noise, high PSRR
A constant-current source feeds a zener diode as a stable voltage reference. A low-pass filter (with a corner frequency of 1.6Hz) prevents zener noise from being introduced into the error amplifier. This is an effective yet lower-cost alternative to expensive voltage reference ICs. The low-pass filter also provides a soft-start characteristic.
The output noise (unloaded) is less than 13µV at 24VDC output (measured using a Tangent LNMP (low-noise measurement preamplifier) and a Fluke 187 50000-count DMM in ACmV mode). The output noise is even less when the output voltage is lower. This is much better than the noise of an IC regulator based PSU tested under identical conditions.
The error amplifier is a discrete implementation of an opamp with a high open-loop gain of 102.5dB. The voltage supply to the error amplifier is isolated with capacitance multipliers to boost its PSRR (power supply rejection ratio). This greatly improves the line regulation performance of the PSU.
A long-tailed pair differential amplifier with current mirror and constant current source forms the first stage of the error amplifier. The second stage is the voltage amplification stage (VAS), also with constant current source load. The 3rd stage is comprised of the power MOSFET output devices configured as a source follower.
High-current MOSFET pass transistors
Two paralleled high-current, highly reliable MOSFETs (rated at 18A each) serve as the "pass" transistor.
The high current rating provides a very high safety headroom against overcurrent damage.
The use of paralleled MOSFETs divides the heat dissipation, simplifying thermal management. Onboard heatsinks can be used which would allow the this PSU to supply up to 1A continuous (with much higher peak currents). More sustained currents are possible by using larger, offboard heatsinks.
The negative temperature coefficient of MOSFETs prevents damaging thermal-runaway conditions that may plague conventional BJT devices.
No current-limiting.
Btw, I can not view the opamp.
The error amplifier is a discrete implementation of an opamp with a high open-loop gain of 102.5dB...
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Topping DX3 DAC with Meanwell MES30A-4P1J 15V, 2A, 90-264Vac
https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-topping-dx3pro-dac-and-headphone-amp.4967/post-145690
(https://www.audiosciencereview.com/forum/index.php?attachments/1549062935514-png.21208/)
with the cheap Chinese stock PSU:
(https://www.audiosciencereview.com/forum/index.php?attachments/1549062551748-png.21205/)
https://www.digikey.com/product-detail/en/mean-well-usa-inc/MES30A-4P1J/MES30A-4P1J-ND/7705081
[PDF] https://www.meanwell.com/Upload/PDF/MES30A/MES30A-SPEC.PDF
(https://media.digikey.com/Photos/Mean-Well-USA-Inc/MFG_MES30A.jpg)
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To dispel some of the power supply myths:
Linear power supplies are not "noiseless", the cheaper ones with simple voltage regulators are much noisier than quality SMPS.
In the old days SMPS would add system noise by injecting carrier frequencies back into the AC power supply lines, with that noise then travelling to other audio system components. Moderns SMPS don't have that problem anymore.
SMPS have better regulation and significantly lower output impedance that contribute to better SQ.
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To dispel some of the power supply myths:
Linear power supplies are not "noiseless", the cheaper ones with simple voltage regulators are much noisier than quality SMPS.
In the old days SMPS would add system noise by injecting carrier frequencies back into the AC power supply lines, with that noise then travelling to other audio system components. Moderns SMPS don't have that problem anymore.
SMPS have better regulation and significantly lower output impedance that contribute to better SQ.
I think there are some major caveats to that. I've noticed a trend lately of people saying SMPS are now perfectly fine to use and better than linear. What gets left unsaid is that these SMPS are few and far between, tend to be custom made, and/or expensive. SMPS still have plenty of issues to contend with. Look at the iPower for instance. IFI has a whole of verbage as to how awesome it is but feedback indicates it is plagued with problems - high pitched noises, sudden failures, and potentially damaging components (iPhono users have had some serious issues to point to the iPower as cause). I've had two and experienced some of these issues and to top it off I didn't think it sounded all that great, even with all that engineering and cool custom packaging. So SMPS still has a ways to go.
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There are SMPS and SMPS. I trust more in the good work of Meanwhile than in the ifi.
Some of the new DACs use super regulators and they with a good SMPS is enough. RME ADI-2 DAC. Others waste them and they make a mess, like Wyred4Sound DAC-2v2 SE DAC, with a terrible/horrible IMPLEMENTATION, vade retro satana.
https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-wyred4sound-dac-2v2-se-dac.6507/
SMPS are more problematic when they have to feed amplifiers with many watts -> a lot of heat (SMPS) + cheap Big capacitors is a bad combination.
Talking about SMPS, a new thread: https://www.diyaudio.com/forums/power-supplies/332893-amplifier-smps-ebay-experience.html
https://www.diyaudio.com/forums/vendor-s-bazaar/318372-modulus-686-380w-4-220w-8-balanced-composite-power-amp-extremely-low-thd-post5677344.html
Yeah, Hypex doesn't have anything that would work. I looked into this a number of years ago when replacing my Linkwitz Pluto modules (3886) with SMPS supplies. I ended up using Connex SMPS300RE. After purchasing six of them, I finally found three that worked well and continue to do so. The other three I threw on the shelf to collect dust.
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AUDIOPHONICS PSHP Linear Power Supply for ifi Audio Pro iCAN 15V 4A
https://www.audiophonics.fr/en/hifi-power-supply/audiophonics-pshp-linear-power-supply-for-ifi-audio-pro-ican-15v-4a-p-12843.html
(https://www.audiophonics.fr/28548-thickbox_default_2x/audiophonics-pshp-linear-power-supply-for-ifi-audio-pro-ican-15v-4a.jpg)
Made in France
The components of this power supply are of first quality:
Metal Resistors
10 capacitors filtering 2200uF / 35V
Voltage Regulator LT1083
Thus, this regulated linear power supply developed by our team comes to compete with more expensive solutions.
Equipped with a 100% Aluminum case, two Jack DC 5.5 / 2.1 & 5.5 / 2.5, this power supply with an extremely stable 100VA transformer even under heavy load, and will allow you to make the best of connected audio components requesting from 15V up to 4A.
Only € 199. Without measurements and more specs. With no possibility to customize, I think. With a cheap Chinese RF/EMI filter.
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TeraDak DC-30 Linear Power Supply - Review, by DarqueKnight
https://www.audiocircle.com/index.php?topic=162655.msg1730866
with graphs from before and after. Wall, PS Audio PowerBase, Teradac DC-30... and iFi Audio iPower.
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Figure 10. FFT plot of passively filtered open circuit AC voltage from the wall. The only signal of value is the large spike on the left, which represents the 60 Hz power signal. Everything else is harmonics, the power company's 470 Hz signaling tone, and noise.
(https://www.audiocircle.com/image.php?id=191269)
Figure 13. FFT plot of open circuit AC voltage measured at the output of the iFi Audio iPower switch mode power supply. No even order harmonics were generated, but the odd order harmonics are significantly greater in amplitude in the voltage from both the wall and the AC regenerator.
(https://www.audiocircle.com/image.php?id=191272)
Figure 14. FFT plot of open circuit AC voltage measured at the output of the TeraDak LPS. In stark contrast to the switch mode power supplies, no AC artifacts at all.
(https://www.audiocircle.com/image.php?id=191273)
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iFi iPower
https://ifi-audio.com/products/ipower/
Effortlessly powerful.
If your system’s power supply is unclean, background noise affects your sound quality.
The iPower cleans this up, addressing the problems at both the output and input stages.
It makes your sound flow cleanly and effortlessly.
and...
The iPower makes music come alive with incredible low-floor noise and adds detail originally lost through conventional power supplies that are often just mobile phone chargers that have no regard for quite power.
The iPower is at least ten times quieter than previous iFi power adapters, twenty times quieter than audiophile linear power supplies and one thousand times quieter than standard wall adapters.
Quiet! Active Noise Cancellation+ (ANC) at work!
Exceptionally quiet power. The measured noise floor is 100x quieter than the Common Noise Filter.
Btw, some posts above I wrote: "There are SMPS and SMPS. I trust more in the good work of Meanwhile Meanwell than in the ifi."
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The Sbooster is worth a try. You should measure this. A great value and fast regulation. This is the problem with most LPS. Too slow regulation to be used with digital.
Steve N.
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I recently received a Paul Hynes Design SR4 modified to supply 15V/2.0A with 0.4 meter silver umbilical for ~$600.00 USD including insured shipping. 6,9 and 12V loads can be selected. For me, Western Union funds transfer was the least expensive option. I don't have experience with other Linear Power Supplies but did shop SBooster, Custom HiFi Cables Ltd, refurbished Mojo Audio and Keces.
My Paul Hynes purchase went smoothly. The SR4 is his standard build ~ 10/month.
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GB for Simple Cap-Mx Regulated Low-Noise PSU
https://www.diyaudio.com/forums/group-buys/334346-gb-simple-cap-mx-regulated-low-noise-psu.html
Have you ever found yourself making a basic circuit that is so simple, that you say to yourself, "it's so simple I will just make it from scratch on veroboard..." It works so well and is so useful, it becomes an integral part of many of your future projects. Before you know it, you have hand-assembled on veroboard the same circuit a dozen times. Well that's what I have been doing whenever I needed a source of ultra quiet (battery-like) single-rail DC power in the range of 5v to about 32v and current under 1amp. I use this countless times for low noise headphone projects, DACs, etc.
Well, I sort of got tired of making them from scratch and worked with JPS64 to put it on a simple 50mm x 75mm board the following: a CLC filter, an Easy-Peasy Juma cap multiplier, and a 78xx regulator, and throw in some smoothing caps, snubbers, output bypass caps, and LED power indicator, and input/output terminal blocks. I typically use a 12v 1000mA Class 2 transformer wall-wart ubiquitous with routers and switches that we accumulate over the years.
That then powers a clean DC-DC step up converter to about 4v+ regulator dropout (circa 2v) above our needed voltage. So for example, if you need a clean 18v supply, add 5v or 23v as the DC-DC stepup output. Put that into this unit, and let its cap CLC filter, cap multiplier, and voltage regulator give you a clean source of 18v with ripple as low as 4uVrms (if you use a TO-220 formatted TPS7A4xxx LDO regulator). If you can live with 50uV noise, a simple 7818 regulator will work fine. I have used this on countless headphone amps and the noise floor measures flat like a battery. Absolutely no mains hum gets through...
You need to be registered to see the pictures and the graphs. I have uploaded an optimized picture of the prototype.
(http://maty.galeon.com/WP-imagenes/hard/Simple-Cap-Mx-Regulated-Low-Noise-PSU-build-v1.jpg)
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Review and Measurements of the HDPlex 200W Supply
https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-the-hdplex-200w-supply.7713/
(https://www.audiosciencereview.com/forum/index.php?attachments/hdplex-200-watt-linear-power-supply-topping-d50-dac-audio-measurements-png.27095/)
(https://www.audiosciencereview.com/forum/index.php?attachments/hdplex-200-watt-linear-power-supply-schiit-modi-3-dac-audio-measurements-png.27097/)
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i got the ifi because of this thread and used it for about a year powering a element h usb card. there's a small improvement in sound.
recently replaced the ifi with, coincidentally, the same 65va lpsu wushuliu linked in the first page of this thread. there's a massive improvement as result.
so, depending on what you're powering, noise is probably not the only thing that matters. larger power reservoir is probably important too.