Speaking of linear power supplies

mhardy6647mhardy6647 Posts: 22,660
edited May 10 in Electronics
I went to NEAR-Fest (https://near-fest.com/ ) last weekend with a mission. My mission (which I chose to accept ;) ) -- to find a decent-quality, fairly robust DC linear power supply, ideally a cheap one.

Well... there was no dearth of power supplies of all shapes and sizes. One vendor had a whole stack of very decent looking ex-lab DC power supplies at what looked like reasonable prices. One slightly homely example caught my eyes. Dual, variable 24 VDC supplies @ 2.5 amps. A little less oompf than I was hoping for, but the price made up for that -- 15 smackers.

The guy who sold it to me said it worked fine -- the only issue was that the mounting bezels for the two meters were... well... not present. I figured a little double-stick tape could provide a simple if not terribly elegant solution... so home with me it came.

Finally got 'round to smoke testing it today. It definitely works -- next step, of course, take a look at the output on a 'scope (or just hook something to it and see how quiet it is -- or isn't).

To paraphrase Crocodile Dundee
That's not a power supply.

t427g3bvd6dw.png


This is a power supply.

33943321368_709a00d16b_b.jpgDSC_4595 (2) by Mark Hardy, on Flickr

:#

Comments

  • codycatalistcodycatalist Posts: 2,498
    That thing is BEEFY!
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
  • motorstereomotorstereo Posts: 1,292
    That would be similar to me using my mc1201's on my khorns.......just a wee bit of overkill :)
  • verbverb Posts: 7,404
    So Mark I’m wondering if my little PASS mono’s would benefit from the same. Any suggestions? 19v, not sure of the current requirement.
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • mhardy6647mhardy6647 Posts: 22,660
    I would think so, yes. I am thinking about trying this HP with the ACA that is (still) here, in fact. The one here is running on two Dell laptop bricks -- they're 90 watt P/S, I think. 90 watts at 19 V corresponds to about 4.75 amps, though :|
  • verbverb Posts: 7,404
    I’ll run upstairs and check em out. See what their rated at. Thanks Mark!
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • dragon1952dragon1952 Posts: 4,687
    I've had great luck with these Chinese R-Core LPS's. I've got 2 exactly like this one, a 5V and a 19V as well as a smaller 9V version without the display. I'm running a NUC with the 19V, an SSD dock with the 5V and a Matrix X-SPDIF 2 with the 9V. Dead quiet and very nice upgrades.
    https://www.ebay.com/itm/100VA-Ultra-low-Noise-100W-LPS-R-core-Linear-power-supply-DC-5V-24V-With-display/132529660801?hash=item1edb622381:g:Zz0AAOSwZlZaQHiF
    ____________________________
    2 channel - PS Audio Stellar S300 amp, PS Audio DirectStream DAC, audio optimized NUC7i5 running Windows 10 Pro/JRiver MC24, Matrix X-SPDIF 2 USB interface, Blackbird SSD dock with 500 GB Samsung 860 EVO, Tom Tutay modded EE Minimax preamp, Furman Elite 15 Pfi power conditioner, Martin Logan Electromotion ESL speakers, Rythmik F12SE subwoofer, Kimber 4TC speaker wire, Gabriel Gold Reflection V2 IC's, VH Audio power cords, Wireworld USB and HDMI/I2S cables
    Computer - Windows 7/JRiver, Topping D10 DAC, Fostex PMO.4n monitors
  • kharp1kharp1 Posts: 3,311
    No info or knowledge of, nor affiliation with, but saw this over on Klipsch forum:

    https://community.klipsch.com/index.php?/topic/184159-hdplex-200w-linear-power-supply/
    Main System:
    Joule-Electra LA 100 MKIII Upgraded by Rich Brkich Pre
    Butler Audio TBD 2250 Amp
    PS Audio DirectStream DAC and MemoryPlayer Transport
    LSA-1 Statement
    SVS SB4000 & SB2000
    Wireworld Equinox 7 bi-wire, Wireworld Silver Eclipse 7 IC

    Secondary Rig:
    Parasound P5, Audio Electronics by Cary Constellation
    Marsh a200s, Audio Elecrtonics by Cary Hercules
    Pioneer Elite DV-45a, Denon DVD-2910
    Klipsch Epic CF-1, Vandersteen 3CE sig
    Analysus Plus Oval

    Backup Gear:
    Pass Labs Aleph 30, McCormack DNA-125, Parasound A21
    Marantz SA-14S1
    Usher CP-6311/Tyler Acoustics Taylo Reference Monitor, LSA-1
  • kharp1kharp1 Posts: 3,311
    Little research shows retail of $485, so, not that great a deal. Might take less.
    Main System:
    Joule-Electra LA 100 MKIII Upgraded by Rich Brkich Pre
    Butler Audio TBD 2250 Amp
    PS Audio DirectStream DAC and MemoryPlayer Transport
    LSA-1 Statement
    SVS SB4000 & SB2000
    Wireworld Equinox 7 bi-wire, Wireworld Silver Eclipse 7 IC

    Secondary Rig:
    Parasound P5, Audio Electronics by Cary Constellation
    Marsh a200s, Audio Elecrtonics by Cary Hercules
    Pioneer Elite DV-45a, Denon DVD-2910
    Klipsch Epic CF-1, Vandersteen 3CE sig
    Analysus Plus Oval

    Backup Gear:
    Pass Labs Aleph 30, McCormack DNA-125, Parasound A21
    Marantz SA-14S1
    Usher CP-6311/Tyler Acoustics Taylo Reference Monitor, LSA-1
  • mhardy6647mhardy6647 Posts: 22,660
    edited June 2
    Dollar for dollar, I'd -- humbly* -- suggest that all y'all be lookin' at laboratory DC power supplies from your favorite surplus dealer (or good ol' eBAY). Obviously, some
    rehab might be required, but you'll be looking at extremely high quality, stable, robust and well designed, engineered and built components if you go the Lambda, HP, etc. route. Prices for lowish-voltage supplies are low to cheap, too.

    ______________
    * of course, humbly :#



  • ClipdatClipdat Posts: 7,083
    kharp1 wrote: »
    No info or knowledge of, nor affiliation with, but saw this over on Klipsch forum:

    https://community.klipsch.com/index.php?/topic/184159-hdplex-200w-linear-power-supply/

    Coincidentally this was just measured at ASR: https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-the-hdplex-200w-supply.7713/
    "Electronic music is human sound adapting to indulge technology, and for some, it feels like the signature sound of energy. New and abstract sounds over hypnotic rhythms can conjure vast soundscapes for escape, pleasure, and transcendence."
  • mhardy6647mhardy6647 Posts: 22,660
    edited June 2
    Clipdat wrote: »
    kharp1 wrote: »
    No info or knowledge of, nor affiliation with, but saw this over on Klipsch forum:

    https://community.klipsch.com/index.php?/topic/184159-hdplex-200w-linear-power-supply/

    Coincidentally this was just measured at ASR: https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-the-hdplex-200w-supply.7713/

    so... in that 'review', the question which was begged -- what does the output of the power supply look like?

    To wit:
    How clean is the DC output?
    How precise are the fixed outputs (or the variable outputs, for that matter)?
    How well regulated is the output voltage as a function of load (current)?

    I mean, those are meaningful parameters, and not difficult to measure -- and directly and both qualitatively and quantitatively comparable to assess this P/S against others (linear or switching).

    :#


  • ClipdatClipdat Posts: 7,083
    Not sure. You should email Amir those questions and post the response here.
    "Electronic music is human sound adapting to indulge technology, and for some, it feels like the signature sound of energy. New and abstract sounds over hypnotic rhythms can conjure vast soundscapes for escape, pleasure, and transcendence."
  • mhardy6647mhardy6647 Posts: 22,660
  • dragon1952dragon1952 Posts: 4,687
    I'd be more interested in a competent person doing a listening evaluation rather than just measurements. If measurements were all it took to determine the end result then we'd all be saving a lot of cash :^ /
    ____________________________
    2 channel - PS Audio Stellar S300 amp, PS Audio DirectStream DAC, audio optimized NUC7i5 running Windows 10 Pro/JRiver MC24, Matrix X-SPDIF 2 USB interface, Blackbird SSD dock with 500 GB Samsung 860 EVO, Tom Tutay modded EE Minimax preamp, Furman Elite 15 Pfi power conditioner, Martin Logan Electromotion ESL speakers, Rythmik F12SE subwoofer, Kimber 4TC speaker wire, Gabriel Gold Reflection V2 IC's, VH Audio power cords, Wireworld USB and HDMI/I2S cables
    Computer - Windows 7/JRiver, Topping D10 DAC, Fostex PMO.4n monitors
  • mhardy6647mhardy6647 Posts: 22,660
    edited June 2
    dragon1952 wrote: »
    I'd be more interested in a competent person doing a listening evaluation rather than just measurements. If measurements were all it took to determine the end result then we'd all be saving a lot of cash :^ /
    Indeed.

    The Seventies (when some, perhaps many, of us, came of hifi age) were rife with a focus on numbers even sometimes at the expense of sound. :(

    And, as in all metrics-based endeavors :/ it's not hard to game the system if all that matters are the quantitative measurements. E.g., tonnes of negative feedback can yield quantitatively low THD, broad, flat bandwidth and high "damping factor" (i.e., low output impedance). The problem is that large amounts of poorly implemented NFB can do way more harm than good -- sometimes quite literally, as in amplifiers that are driven to
    self-destructive ultrasonic oscillation by reactive loads (such as - ahem - Polk Audio's somewhat infamous "Cobra Cables"). :#

    The irony of this Onkyo integrated amplifier brochure was completely lost on me when I was amplifier shoppin' in 1977-78.

    12017183446_78b4c69b64_b.jpgonkyo by Mark Hardy, on Flickr

    Full disclosure - the A-5 and A-7 were actually pretty darned nice amplifiers, silly ad copy notwithstanding :p

    Legendary HH Scott engineer Daniel von Recklingshausen hit the nail on the head with his oft-quoted quip:
    If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing.

    http://hhscott.com/vonrecklinghausen.htm

    i0nf2b9uadkd.png

  • dragon1952dragon1952 Posts: 4,687
    Yes. I remember when I was stationed in Germany in '76-'79 which was right about when the spec wars began. I remember agonizing over the spec sheets of various receivers when I should have just trusted my ears.
    ____________________________
    2 channel - PS Audio Stellar S300 amp, PS Audio DirectStream DAC, audio optimized NUC7i5 running Windows 10 Pro/JRiver MC24, Matrix X-SPDIF 2 USB interface, Blackbird SSD dock with 500 GB Samsung 860 EVO, Tom Tutay modded EE Minimax preamp, Furman Elite 15 Pfi power conditioner, Martin Logan Electromotion ESL speakers, Rythmik F12SE subwoofer, Kimber 4TC speaker wire, Gabriel Gold Reflection V2 IC's, VH Audio power cords, Wireworld USB and HDMI/I2S cables
    Computer - Windows 7/JRiver, Topping D10 DAC, Fostex PMO.4n monitors
  • mhardy6647mhardy6647 Posts: 22,660
    edited June 2
    dragon1952 wrote: »
    Yes. I remember when I was stationed in Germany in '76-'79 which was right about when the spec wars began. I remember agonizing over the spec sheets of various receivers when I should have just trusted my ears.

    Yeah, I did, too -- fortunately, I also listened a lot, too.
    Perhaps even more fortunately, some of the stuff that measured well also sounded good.

    :)

    As a strictly editorial aside: the more of those "Audio Science Review" things I read, the more I wonder if it's not simply a mammoth put-on; a parody of the objectivists (who are, needless to say, low-hangin' fruit for parody).

    E.g., harping on signal to noise ratio -- Folks like me who use truly high-sensitivity loudspeakers might stand to hear a difference between SINAD of, say, 110 and 120 dB -- folks listening through today's fashionable mid-80s dB/watt at 1 meter loudspeakers... not so much.

    And THD as a surrogate for sound quality? Typical dynamic loudspeakers (cones, domes, planars, and whatnot) have output THD, particularly in the bass, on the order of several percent. If one hears a difference between an amp with, say, 0.01% and 0.1% THD on a real-world loudspeaker, it's probably not the difference in amplifier THD that one is hearing.

    THD is easy to measure but pretty much unrelated to sound quality.
    The spectrum of harmonic distortion components produced by an amplifier does have important sonic consequences -- but that ain't what total harmonic distortion measures, of course.

    B)



    You could look it up, as they say :)

  • DarqueKnightDarqueKnight Posts: 6,559
    mhardy6647 wrote: »
    Dollar for dollar, I'd -- humbly* -- suggest that all y'all be lookin' at laboratory DC power supplies from your favorite surplus dealer (or good ol' eBAY). Obviously, some rehab might be required, but you'll be looking at extremely high quality, stable, robust and well designed, engineered and built components if you go the Lambda, HP, etc. route. Prices for lowish-voltage supplies are low to cheap, too.

    ______________
    * of course, humbly :#

    That's great advice, but for right now, I'll vainly* stick with the aesthetically sleek linear power supplies from the audiophile power supply companies. :)

    _________
    *of course looks matter.

    ez6m31ydr9gy.jpg

    jozqlsah5lv7.jpg

    4h0xv6lc7fcx.jpg




    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
    "Knowledge, without understanding, is a path to failure."~DK
    "Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
  • F1nutF1nut Posts: 42,505
    Amir......LOL.......LMAO......LOL.......
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


    President of Club Polk

  • CGTIIICGTIII Posts: 647
    edited June 3
    Not for 19V or 5V, but for 3, 4.5, 6, 7.5, 9, and 12V up to 2A, this is said to be regulated and linear. Bought one for my DAC after much research. May start using one on my modem and router too.
    Expect that there will be bumps in the road. Choose to not let them rattle you.

    Lovin' my salvaged 10As! Assist to @lawdogg.
    Polk - SDA-2Bs, 11TLs, (4) M7s, RTi4s, RT35is, RTi28s, RT3s, S4s, M3s, various centers.
    Boston - S8, S6s, S4s.
    M&K V4, M&K VX-7B, JBL SUB150P, Jamo Sub 250, Realistic T1000s, and others.
    ​Thompson Adventures, Inc.
  • mhardy6647mhardy6647 Posts: 22,660
    F1nut wrote: »
    Amir......LOL.......LMAO......LOL.......

    I think he just might be the Andy Kaufman of audio review(ers).

    Food for thought.

    B)
  • mhardy6647mhardy6647 Posts: 22,660
    edited June 3
    mhardy6647 wrote: »
    Dollar for dollar, I'd -- humbly* -- suggest that all y'all be lookin' at laboratory DC power supplies from your favorite surplus dealer (or good ol' eBAY). Obviously, some rehab might be required, but you'll be looking at extremely high quality, stable, robust and well designed, engineered and built components if you go the Lambda, HP, etc. route. Prices for lowish-voltage supplies are low to cheap, too.

    ______________
    * of course, humbly :#

    That's great advice, but for right now, I'll vainly* stick with the aesthetically sleek linear power supplies from the audiophile power supply companies. :)

    _________
    *of course looks matter.

    ez6m31ydr9gy.jpg

    ...



    I do see that point -- but I like the purposeful look of the laboratory.
    Maybe something to do with my upbringing.

    :)

    ... oh, and the power switch on the HP P/S did say "on" from the factory; just sayin'.

    ;)


    ez6m31ydr9gy.jpg
  • StonecutterStonecutter Posts: 33
    mhardy6647 wrote: »
    mhardy6647 wrote: »
    Dollar for dollar, I'd -- humbly* -- suggest that all y'all be lookin' at laboratory DC power supplies from your favorite surplus dealer (or good ol' eBAY). Obviously, some rehab might be required, but you'll be looking at extremely high quality, stable, robust and well designed, engineered and built components if you go the Lambda, HP, etc. route. Prices for lowish-voltage supplies are low to cheap, too.

    ______________
    * of course, humbly :#

    That's great advice, but for right now, I'll vainly* stick with the aesthetically sleek linear power supplies from the audiophile power supply companies. :)

    _________
    *of course looks matter.

    ez6m31ydr9gy.jpg

    ...



    I do see that point -- but I like the purposeful look of the laboratory.
    Maybe something to do with my upbringing.

    :)

    ... oh, and the power switch on the HP P/S did say "on" from the factory; just sayin'.

    ;)


    ez6m31ydr9gy.jpg

    I'm not sure what Carly Simon's great song "You're So Vain" has to do with linear power supplies (other than DK's reference to his own "vanity" for preferring "aesthetically sleek power supplies"), but I very much appreciate your posting this You Tube video.

    It brings back a lot of very fine memories of the day . . . ..
  • mhardy6647mhardy6647 Posts: 22,660
    you hit the nail on the head.

    vanity, thy name is power supply.

    :)
  • StonecutterStonecutter Posts: 33
    Vanity is the power supply of us all.

    To quote Thackeray's ending to the great Victorian novel "Vanity Fair":

    “Ah! Vanitas Vanitatum! Which of us is happy in this world? Which of us has his desire? or, having it, is satisfied?-Come, children, let us shut up the box and the puppets, for our play is played out.”
  • DarqueKnightDarqueKnight Posts: 6,559
    edited June 4
    mhardy6647 wrote: »
    One slightly homely example caught my eyes. Dual, variable 24 VDC supplies @ 2.5 amps.

    On second thought, I see a need for me to invest in one of those homely, variable output, lab grade LPSs for test and evaluation purposes.

    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
    "Knowledge, without understanding, is a path to failure."~DK
    "Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
  • mhardy6647mhardy6647 Posts: 22,660
    mhardy6647 wrote: »
    One slightly homely example caught my eyes. Dual, variable 24 VDC supplies @ 2.5 amps.

    On second thought, I see a need for me to invest in one of those homely, variable output, lab grade LPSs for test and evaluation purposes.

    I like your thinking, ol' son...

    B)
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!