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Still using a switcher for main AC input.
Actually no, the power supply architecture is totally different from Squeezebox. Switchers are only used for certain non-audio, high-current stuff (displays, knob, CPU etc), otherwise they are not in the path at all. Linear supplies are used for all analog, DAC, and digital clock paths, and they use toroid transformers to the AC line, with separate secondary windings for each function.
1. Great word clock input and output support, though most DACS can't take advantage of the inputs/outputs. Will make DCS owners happy!
Quote from: Wayne1 on 24 Jul 2006, 11:47 pmStill using a switcher for main AC input.Actually no, the power supply architecture is totally different from Squeezebox. Switchers are only used for certain non-audio, high-current stuff (displays, knob, CPU etc), otherwise they are not in the path at all. Linear supplies are used for all analog, DAC, and digital clock paths, and they use toroid transformers to the AC line, with separate secondary windings for each function.
In other words, if my only purpose is the have the ability to accurately transfer signals from my pc to my DAC, am I correct to say that a stock SB3 (perhaps only upgrading the digital connectors) is all I need?
I feel the power supply in ANY transport plays a very big part in the end result of the sound.For a transport, it's job is to get the digital signal out of the box and into the DAC section. The signal has to start somewhere and it starts with the power supply. It the supply is "noisy" the noise will carry over into the signal to the DAC. If the supply is slow or has problems maintaining control, you will have overshoots and ringing.Everyone is so concerned eith the magic word "jitter" that they forget to look back to what actually causes the signal to exist.A very good power supply for a transport CAN and WILL change the sound of the system.Zybar has had different supplies for hi SB2 system feeding a TacT EQ/DA. I believe he has heard differences with different power supplies.Barry in Houston is now comparing the same thing.There is far more to the sound of a digital system than just "jitter" specs. Beyond the power supply there is what the analog circuit is made up from. What kind of coupling caps are used in the signal path? These will have a greater affect on the final sound that what type of DAC chip is used. What op-amps are used? Many folk report quite a varience of sound with different op-amps. How is the power supply run to the op-amps? What sort of caps are used in the op-amp supply? All of these non-sexy parts play a great role in the end sound of the source. There are not a lot of published specs that can be found and easily related to. One thing you can be certain of is that NO electrolytic signal coupling cap sounds as good as a film and foil coupling cap.
Are you using a similar analog output circuit to the one AK uses in their evaluation board?http://www.asahi-kasei.co.jp/akm/en/product/ak4396/ekd4396-sbw1-01.pdf
The schematic is quite similar, but the layout and types of components used are very different from the eval board. The eval board used a 2-sided pcb, socketed through-hole parts, and of course does not include Jung regs. Our design is smt parts, very high quality passives, wide power rails on the internal planes, gold plating etc. It outperforms the eval board by a wide margin!
I previously did own an EA modified S-7700, but unlike Phil, I didn't feel it was better than either Wayne's or Vinnie's SB2 + upgraded power supply when used as a transport only.