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Thread: Regulated Linear Power Supply for Raspberry Pi + Pi 2

  1. #1
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 370
    I'm Chris.

    Default Regulated Linear Power Supply for Raspberry Pi + Pi 2

    150 inc postage

    This power supply does a wonderful job of improving sound from the RPI - power supplies are everything. Have a read up of the reviews on line.

    It supplies 5 volts either to an RPI, or without the adaptor, to any device needing 5volts

    I bought it from new, it is just over 1 year old and is unmarked.


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    From the manufacturer

    MCRU and Longdog Audio have developed a regulated linear power supply based on the multi award winning 2 case design which was reviewed by Hi-Fi Choice magazine and award 5 stars and a recommended badge. Here is a review of the 5V power supply we sent to Hi-Fi Choice.
    Our power supplies improve sound quality based on 100's of satisfied customer feedbacks. The raspberry Pi and Pi 2 requires 5V DC to power it, it can be powered by the voltage from a USB socket but this can be noisy, using a fully regulated design will enhance performance and get the very best audio sound from the Pi when used as a music source.
    The Pi uses a micro USB socket for power, we supply a DC plug to micro USB adpater cable to connect the linear psu to your Pi.
    The design rational from Longdog founder Nick Gorham is below.
    When thinking of regulation, it’s worth remembering the Roman god Janus. Who was the god of gateways, and was a two faced god looking in both directions. Likewise a good voltage regulator is required to look in both directions at once. From one direction you have the mains supply, with the ever increasing noise, distortion and random variation that exists on our household mains supply. In the other direction you have the device you are supplying power to. The load will be asking constantly varying current, and the job of the regulator will be to ignore the varying load and to supply a rock steady voltage that ignores the changing load.
    To ask a single regulator to perform both tasks means that it can not do either as well as it could. We don’t ask our regulators to be two faced, we split the two functions into two separate regulators and put them both where they can do the best job.
    The first regulator is close to the mains supply, its job is to take the incoming mains and convert it into a low(ish) noise DC supply, and to isolate the mess that is our household power lines from what follows. In most power supplies on the market, the output of the first stage would be directly connected to the load device, and that would certainly be an improvement over the supplies that most manufactures provide. But we can do better by adding the other face of Janus to the system.
    The second regulator is supplied with a clean low noise supply, and its job is to handle the changing demands of the load. To do that, it needs to be as close to the load as possible. So we remove the second regulator from the main box, and place it close to the load, both electrically and physically, that removes it from the noise and interference of the mains supply, and allows it to spend its time looking towards the load. Typical commercial voltage regulator chips are general purpose devices, but are not quiet enough for the task on hand, so the second regulator uses a bespoke regulator based on a low noise multi stage filtered voltage reference, a low noise error amplifier and a high current low resistance mosfet. To allow it to handle the changing load it also needs to supply current on demand, so all the remaining space in the second regulator is filled with low impedance capacitors to act as a local energy source.
    Using the two stages of regulator, we achieve a noise floor equal or better than most battery supplies, and a effective source resistance of the order of 0.02 ohm (and the short cable run to the load avoids increasing this valve by adding copper where its not needed, and the use of a discrete regulator design allows that tiny value to be maintained way above the frequency any audio device operates at.

  2. #2
    Join Date: Mar 2014

    Location: KY - Scotland

    Posts: 1,940
    I'm Mike.

    Default

    Ampage?

    It's probably 2a but thought I'd ask.

    I had one that I sold recently and they do make a good difference​over the usual wallwart supplied with most devices.

  3. #3
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 370
    I'm Chris.

    Default

    Quote Originally Posted by mikeyb View Post
    Ampage?

    It's probably 2a but thought I'd ask.

    I had one that I sold recently and they do make a good difference​over the usual wallwart supplied with most devices.
    I cant find the amperage anywhere on the MCRU Web site, but it says it replaces any Walmart switching power supply. It certainly never got more than mildly warm running the RPI

  4. #4
    Join Date: Feb 2012

    Location: Estonia

    Posts: 62
    I'm ahto.

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    would it not suit a Pi3?
    Fletcher Omega .3 / Cartridge Man Conductor / MusicMaker III / Leak Troughline III GTA / Vecteur D-2.2 / Wadia 121 / Croft Mega Micro II (2015) / Croft 7R monos / Usher Mini Dancer 2 DMD / RFC & AntiCable

  5. #5
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 370
    I'm Chris.

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    Quote Originally Posted by eksiil View Post
    would it not suit a Pi3?
    I'm sure it will suit the Pi3 but I was just quoting from the MCRU advert.

  6. #6
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 370
    I'm Chris.

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    And for those wondering if it comes with a box.
    Attached Images Attached Images

  7. #7
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 202
    I'm Adam.

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    Top box that ! Glwts chris
    "lack of passion is fatal"

    LP12, Kore, Lingo2, Aro, SKale / DV XX2Mk2, Benz Micro Glider L2 / WAD 300b Power Modded, Mesh Plate Valves / David Coe AD Audio 'Satchmo' Pre & Phono / Hashimoto HM-7 SUT
    / Kudos Cardea 2 / Rpi3 & Digi + pro / SW1X Audio Design USB-SPdif / SW1X Audio Design DAC 1 Signature / Synology NAS Drive / Tidal HiFi

  8. #8
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 370
    I'm Chris.

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    Quote Originally Posted by WESTLOWER View Post
    Top box that ! Glwts chris
    Thanks. Worth the entrance money on its own.

  9. #9
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 370
    I'm Chris.

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    Now 140 inc postage

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