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-   -   Shigaraki Drive and DAC images (http://www.diyaudio.com/forums/digital-source/61064-shigaraki-drive-dac-images.html)

lohk 19th July 2005 08:07 PM

Shigaraki Drive and DAC images
 
I am sure that this will be of interest for many of you.

Recently the German mag "ImageHiFi" (4/2005) did a favorable review of the Shigaraki CDDrive and DAC. The wrote "... the Shigaraki system eats many other very expensive CD Players for breakfast..."
I hope I do not break any copyright rules by posting excerpts of the images, if yes, please do not tell them :)


In the article were a few interesting inside shots of the PSU and the DAC.

First the PSU opened:

Now everybody can see clearly that they use half-wave rectifying (like NAIM, and like I have always proposed...), that means two secondaries with two diodes only for a single output voltage. The diodes seem to be the already mentioned General Semiconductor FE5B (or C), 5Amps rated. Considered the size of the DAC including the ceramic case (7,6 x 7,6 x 14 cm), the transformer is quite small.

lohk 19th July 2005 08:08 PM

2 Attachment(s)
the psu

lohk 19th July 2005 08:11 PM

2 Attachment(s)
Second the DAC opened:

Here the image does not reveal the complete secret, but a lot of details nevertheless. The pcb looks very much "47labs-style", a bit DIY too much, considered to the efforts of some of you here. It is a mixture of p2p and pcb, it has to be like that, I think, although some details (the blue wire!) looks like an afterthought.
The DAC uses a single regulator (a 7805 perhaps), smoothing caps are either non-existent or not visible. SPDIF input (with a carbon 75R resistor) goes into a CS8414 directly. The pll filter uses an elcap (or is it the smoothing cap for the digital supply side?). The ShagirakiDAC uses a TDA1543 not in the DIP8 case, but in the 16minipack smd size, recognizable by the 8 "outside" feet soldered together, although the exact number on the chipcase is not fully readable. Maybe the heat dissipation of this package is better the smaller DIP8 chip. Two 3k carbon resistors are soldered on top of the TDA, maybe the IV conversion resistors. Another stripped cap is visible, maybe one of the output caps.

That is more or less what I can see. Now it is up to you for conclusions and further analysis.

moamps 19th July 2005 08:44 PM

Re: Shigaraki Drive and DAC images
 
Quote:

Originally posted by lohk
...Now everybody can see clearly that they use half-wave rectifying...that means two secondaries with two diodes only for a single output voltage.....
It's a full wave rectifier then, don't you think?

ble0t 19th July 2005 08:57 PM

Looks pretty ugly to me, both visually and design wise...I hope they aren't charging much for that thing, but something tells me they are :xeye:

lohk 19th July 2005 09:02 PM

full-wave, sure... but no bridge, as everybody thought...

Peter Daniel 19th July 2005 11:13 PM

Actually this arrangement of rectifiers could be expected, as it also appears in Kusunoki DACs. The rumour is that 47Labs pay royalties to Kusunoki for using non oversampling concept, that could be one reason the price of the DAC is so high.

reMC 20th July 2005 05:04 PM

I guess it doesn't give us that more info then we allready have.

Except for one side of the lay-out. Pretty important.

reMC 20th July 2005 05:08 PM

Quote:

Originally posted by lohk
Second the DAC opened:
SPDIF input (with a carbon 75R resistor) goes into a CS8414 directly.
There could be capacitors on the other side?

Quote:

The pll filter uses an elcap (or is it the smoothing cap for the digital supply side?).
How do you recognise which one is the pll filter?

lohk 20th July 2005 07:58 PM

Ha, sure there must be caps on the other side :whazzat:
and the cap can be for any of the mentioned purposes, its an elcap.

I should not have wasted my precious time in scanning the images and post them to this forum, you have known all facts anyway.


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