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Re: DIY DAC

Hi,

> I was thinking of replacing the Crystal and/or PLL with XO
> products by Tentlabs if applicable....

You could do that (You need the 22.5792MHz variant), but I may forgiven for my prejudices, I just really do not like the concept used in the DIR.

Considering how simple a CS8412/PCM56 DAC is to make I see no reason not to to do it "dead bug" wiring, such hardwired versions tend to be better sounding anyway, I tend to use a small piece of copper sheet bonded to a piece of solid hardwood as "platform" on which to place my "bugs".

If you spend some time you can use 3D approaches to wiring that allow current loops to be a fraction of what is needed for PCB's. If you don't want to do dead bug wiring you can use matrix boards (prototyping boards) for one-off designs.

While loads of people get worried about the 22.7uS time offset between channels when inverting the wordclock to drive the DAC's I tend not to position either my head (and thus my ears) or my speakers to better than 1cm accuracy, so I do not worry about the < 1cm timeshift of one speaker too much.

In the DAC's I tried I never noticed any difference I would attribute to this timeing difference between the channels for the PCM56/63 Types compared to the TDA's.

So, what you need is the CD8412 set to the correct output mode, a pair of PCM56 and a 74HC04 inverter. The circuit is so brutally simple (and there is no observable advantage to the more complex circuits to split the signals between R/L Channel) that designing a PCB is a total waste of effort in my view.

Hell, my first Adagio DAC was fully hardwired, except the raw PSU Circuit.

Ciao T

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