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Longdog Audio have now developed a fully regulated linear power supply rated up to 2.5 amps current draw. This power supply will be suitable for music servers such as the Lumin D1, DAC’s that are powered by DC voltage, streamers and any other equipment that currently uses a switch mode power supply wall wart.
If you are un-sure what the power requirements are for your equipment simply look at the label on your existing power brick. As an example 230V AC input, 12V DC x 2 amps output. Or simply advise us what your equipment is and we will advise which of our power supplies is suitable.
Our power supply ships with a standard mains lead which can be up-graded using the menu system as well as a better fuse or iec inlet, we can also supply 120V versions and the mains lead to suit your country, UK, Schuko for Europe, USA or Australian / New Zealand so it really is a universal design which users worldwide can benefit from.
We have also installed the new Oyaide audiophile quality DC power plug on this new PSU.
The design thoughts behind the 2 box PSU are 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 frequency any audio device operates at.
Specifications
OPTION ONE – STANDARD MODEL – BASIC MAINS LEAD £295.00
OPTION TWO – KIMBER DC KABLE – FURUTECH GOLD PLATED IEC INLET – AMR GOLD PLATED FUSE – SUPRA LORAD MAINS LEAD TO SUIT YOUR COUNTRY £350.00
OPTION THREE – PURE SILVER DC CABLE – FURUTECH RHODIUM PLATED IEC INLET – SR ORANGE FUSE – ISOL-8 WAVE MAINS LEAD TO SUIT YOUR COUNTRY £650.00
OPTION Four
Pure Silver DC Cable, Furutech Rhodium plated IEC inlet, SR Orange fuse, MCRU No. 75 SE mains lead to suit your country, MCRU isolation support stand £750.00
If you live outside the UK tax will be deducted form the above prices by default.
Dac Power Supplies
2.5 Amp Linear Power Supply for Music Servers + Streamers
Available Models
OPTION ONE – Standard Model – Basic mains lead £295.00
OPTION TWO Kimber DC Kable, Furutech Gold plated IEC inlet, AMR Gold plated fuse, Supra Lorad mains lead to suit your country £450.00
OPTION THREE Pure Silver DC Cable, Furutech Rhodium plated IEC inlet, SR Orange fuse, Isol-8 Wave mains lead to suit your country £650.00
OPTION Four Pure Silver DC Cable, Furutech Rhodium plated IEC inlet, SR Orange fuse, MCRU No. 75 SE mains lead to suit your country, MCRU isolation support stand £750.00
Apogee MIni DAC Linear Power Supply
Arcam irDAC Linear Power Supply
Audiolab M-DAC Regulated Linear PSU
sadsammy (verified owner) –
Now please don’t laugh, I am currently using one of these superbly constructed power supplies with an Amazon Fire TV box. There said it! Pausing momentarily for the giggles to die down. It is a shame I can’t upload a photo so you can see the broadness of my smile. Sorry I don’t know the correct terminology here but everything has improved immensely from a much cleaner and brighter picture to a fuller and more precise sound. I also don’t know how to quantify it but the download speed has also gone up a notch or two as well. I purchased Option Two as I couldn’t resist the upgrades for not much more, everything I have purchased from MCRU has always been professionally built and have made improvements somewhere, sometimes subtle but always there.
Thank you MCRU.