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Old 7th October 2011, 04:45 PM   #1
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Default Squeezebox Touch Linear PSU MkII Up-Dated

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New up-graded Squeezebox Touch Linear PSU. This is a 2 box version with a separate regulation stage and has had one positive review on the first day of launch here. It costs 165 plus shipping, we have sent them to the USA, Australia, China, Europe, Brazil and many more places. Squeezebox Touch PSU.

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The power supply is available in 240V and 120V versions and is supplied with a basic power cord to suit your country free of charge. It has the correct DC plug to fit the touch so is basically plug and play. The PSU is fitted with an IEC inlet which enables you to fit a better power cord or use the supplied one.

Available now on my website along with various up-grade options. Shipping worldwide at cost. If the actual shipping cost is lower than charged I will refund the difference on delivery to your country.

Mains Cables R Us Squeezebox Touch PSU Mk II

A few words about the design:-

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.

The power supply is also available to work with any DC powered DAC or NAS drive or steaming device such as ARCAM R-DAC, , M2TECH YOUNG DAC, CAMBRIDGE AUDIO DACMAGIC +, BERESFORD CAIMAN DAC, MUSICAL FIDELITY V-DAC, M2TECH HIFACE EVO, APOGEE MINI DAC,

Last edited by mainscablesrus; 19th February 2012 at 12:10 PM. Reason: photo up-dated
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