Regulated Linear Power Supply for Cocktail Audio X12
# 24V 3.5 Amp
# Fully Regulated Design
# Silver or Black
Designed and built in the UK, the MCRU range of regulated linear power supply’s are award winning designs which improve sound quality of everything connected to them. So far we have 4 Hi-Fi Choice 5 star reviews for our PSU’s with more designs planned. Designed in conjunction with Longdog Audio, the supply powers any audio component that uses DC. Please note this psu is heavy so the shipping charge reflects that.
We have designed power supply’s to fit the Squeezebox Touch, Cambridge Audio Dacmagic, Dacmagic + and Dacmagic 100, Chord QuteHD DAC, Audiolab M-DAC, Arcam R-DAC, and many others too numerous to mention.
The latest creation is for the Cocktail Audio X12 music streamer. The power supply simply plugs into the DC socket on the back of the X12 and provides the fully regulated DC in place of the supplied switch mode power supply which are well documented as being noisy and bad for sound quality.
Some thoughs from the designer about mains regulation……………….
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.
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