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Thread: Is the 5 volt USB supply from a computer clean

  1. #1
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 772
    I'm Chris.

    Default Is the 5 volt USB supply from a computer clean

    I am looking to supply a bit of kit with 5 volts. I hate switching power supplies and the obvious answer is to swap to a linear power supply.

    Currently the kit is powered from a laptop computer via USB but the computer itself is powered from the ubiquitous switching power supply.

    I was thinking if I switch off the mains power to the computer and let it run on itís batteries will I get a clean 5 volts or will the internal machination of the computer conspire to dirty the USB 5 volts
    SW1X Universal Music Server UMS I Signature with Power Supply Unit PSU I Signature
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    Silver mains cables, interconnects and speaker cables by SW1X

  2. #2
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,827
    I'm Alan.

    Default

    It won't be as clean as a linear, there will be some sort of switching converter in the computer to give the 5V.

  3. #3
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 772
    I'm Chris.

    Default

    Quote Originally Posted by Firebottle View Post
    It won't be as clean as a linear, there will be some sort of switching converter in the computer to give the 5V.
    Thanks Alan, just as I suspected.
    There are a number of 5v linear supplies on ebay for about £50, but not surprisingly none give noise specs. Any recommendations from people
    SW1X Universal Music Server UMS I Signature with Power Supply Unit PSU I Signature
    SW1X USB I Signature
    SW1X DAC II Special
    SW1X Open Baffle Speakers containing both vintage and modern alnico drivers. All silver wired.
    Transcription Audio single ended, 211 triode, integrated, driving the 4" Siemens Klangfilm tweeters and 8" SEAS exotic W8 midrange drivers.
    ICE 1000ASP driving vintage 15" Altec VOTT 416 bass drivers via MiniDSP Digital Sound Processor
    Silver mains cables, interconnects and speaker cables by SW1X

  4. #4
    Join Date: Feb 2017

    Location: Manchester, UK

    Posts: 158
    I'm Luke.

    Default

    Quote Originally Posted by bumpy View Post
    There are a number of 5v linear supplies on ebay for about £50, but not surprisingly none give noise specs. Any recommendations from people
    This is relevant to my interests!

    I've almost pulled the trigger on a 5v IFI supply several times, but was waiting to hear more about the long promised 5v supply from Allo, which is still due to be released imminently, AFAIK. I would also be keen to hear views on the eBay LPS modules...

  5. #5
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 772
    I'm Chris.

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    Quote Originally Posted by LC1979 View Post
    This is relevant to my interests!

    I've almost pulled the trigger on a 5v IFI supply several times, but was waiting to hear more about the long promised 5v supply from Allo, which is still due to be released imminently, AFAIK. I would also be keen to hear views on the eBay LPS modules...
    OK Luke. We wait with bated breath
    SW1X Universal Music Server UMS I Signature with Power Supply Unit PSU I Signature
    SW1X USB I Signature
    SW1X DAC II Special
    SW1X Open Baffle Speakers containing both vintage and modern alnico drivers. All silver wired.
    Transcription Audio single ended, 211 triode, integrated, driving the 4" Siemens Klangfilm tweeters and 8" SEAS exotic W8 midrange drivers.
    ICE 1000ASP driving vintage 15" Altec VOTT 416 bass drivers via MiniDSP Digital Sound Processor
    Silver mains cables, interconnects and speaker cables by SW1X

  6. #6
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 772
    I'm Chris.

    Default

    With Hi Fi almost all opinions on kit are subjective. But here is a product that can be measured scientifically so that meaningful comparisons can be made i.e. value for money.

    Why then do so few sellers quote figures. My guess would be, that the power supplies are not as good as their superlative descriptions would have you believe.
    SW1X Universal Music Server UMS I Signature with Power Supply Unit PSU I Signature
    SW1X USB I Signature
    SW1X DAC II Special
    SW1X Open Baffle Speakers containing both vintage and modern alnico drivers. All silver wired.
    Transcription Audio single ended, 211 triode, integrated, driving the 4" Siemens Klangfilm tweeters and 8" SEAS exotic W8 midrange drivers.
    ICE 1000ASP driving vintage 15" Altec VOTT 416 bass drivers via MiniDSP Digital Sound Processor
    Silver mains cables, interconnects and speaker cables by SW1X

  7. #7
    Join Date: Jan 2008

    Location: Out on the wild and windy moors Lancs / Yorks Border

    Posts: 417
    I'm Andy.

    Default

    On the back of the OP question, if an item of kit asks for 5v 3a to power it is it ok to feed it 5v 2a or will that cause problems?
    Analogue
    301 / 3012 / 2m black
    401 / PU7 / AT33ev / Highphonics SUT
    NVA Phono 2 + PSU X 2
    Digital
    Vortexbox, SBT / Teac Dac
    Cambridge CXC
    Amps
    Tron Seven Linestage, Glasshouse TVC or Quad 44
    Quad 303, or Bel Canto Set 40 or NG 300B Set Monoblocks
    Speakers
    Tannoy GRF Memory.
    Tannoy ST100.

  8. #8
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 2,617
    I'm Lawrence.

    Default

    Quote Originally Posted by Andy831 View Post
    On the back of the OP question, if an item of kit asks for 5v 3a to power it is it ok to feed it 5v 2a or will that cause problems?
    Problems. Overheating on power supply and various issues with the kit depending on what it is.

    Sent from my BLN-L21 using Tapatalk

  9. #9
    Join Date: Jan 2008

    Location: Out on the wild and windy moors Lancs / Yorks Border

    Posts: 417
    I'm Andy.

    Default

    Thanks Lawrence so its a no no
    Analogue
    301 / 3012 / 2m black
    401 / PU7 / AT33ev / Highphonics SUT
    NVA Phono 2 + PSU X 2
    Digital
    Vortexbox, SBT / Teac Dac
    Cambridge CXC
    Amps
    Tron Seven Linestage, Glasshouse TVC or Quad 44
    Quad 303, or Bel Canto Set 40 or NG 300B Set Monoblocks
    Speakers
    Tannoy GRF Memory.
    Tannoy ST100.

  10. #10
    Join Date: Oct 2016

    Location: Hampshire

    Posts: 251
    I'm Mel.

    Default

    I use one of these, along with a couple a similar ex Maplin batteries/chargers with all my Pi's and would not go back to any mains tethered device.

    https://www.amazon.co.uk/HUAF-Portab.../dp/B07M6JFCLZ


    The HUAF in particular is one i like - it has a quality feel, amazing battery life and can power 2x 2.5 amp devices and a 1x 1amp device at the same time should you wish.

    Its a bit bigger and heavier than it may look - about the size of an iphone 6 plus and slightly heavier.

    Its also good for charging my iphone and bluetooth earphones so gets plenty of use.

    Mel

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