TDA1543 from dddac.de/ma_dac21.htm

[fedde]

That extra hour is quite welcome !!!

Fedde

 

[Bricolo]

Re: Fan supply solution

Hi Mr. Picolo

Don't worry , the solution is on hand ...... simply use a separate power supply to avoid power supply influence ...... and as far as my knowledge reach , there are brushless fans available too .

For those who might be worried about noise effects : the 12 volt fan in my Marantz player works at 5 volt !! the cover of the player disable all audible noise .
To avoid possible resonance on the PCB I glued the fan with siliconkit .

The main reason I decided to use a cooling fan is the much better thermal stability of the 1543 stack . don't forget that thermal drifts automaticly means that bias and ref voltage of the dac chips change too . not recommendable IMO .

Happy Ears .

Please call me Bricolo, like eveyone else here do


I know about brushless fans, silent ones...
I used to work a lot with fans, when I tweaked my computer in order to run it cool and the most silent possible (now it's ok, my screen makes more noise that my computer )

But there are many alternatives for fans, and some of them can give you additional advantages here.

I won't lie, the fan is the most efficient solution here, sure.
But in this case, I would test convection first.

My solution woulr require not to stack the ICs, that can be seen as a disadvantage (But I don't even want to imagine how the signal going to the 8th IC looks like, after 5cm on which the signal lines run parallel, 8 solder points...)

Place all the chips you want on a nice pcb, decouple them individually. Then, place on each a tiny heatsink, a small one that has the same dimentions as the chip will be enough.
Don't forget to connect the heatsinks to ground.

And voila! You have your multi-1543 DAC, without fan, capable of 9V without problems (at least without heat problems), and with a good shield.

That's what I would do.

 

[Happy Ears]

Re: Re: Fan supply solution

Please call me Bricolo, like eveyone else here do

Apologizes for that mistake Mr Bricolo , I honestly didn't misused your name by purpose !
It must be the latest bottle of Heineken that caused the error ;-)


I strongly believe that the stacking methode is a much better solution that soldering 8 pcs. on a flat PCB surface ... Imagine all the needless signal travelling across the chips ... ( antenna effect ) , many cross influences .. no certainly not my choice .
I now benefit from air as isolator , very thin soldering points ( witch are extremely close to each other ) .
All components on my PCB are mounted within "one square inch" !

Happy Ears

 

[rwagter]

Bricolo,

I also just ordered the dddac PCB ad was indeed thinking about a small PCB. My thought were something like this.

An externally hosted image should be here but it was not working when we last tested it.

A nice small signal ribbon and youvan just mount a small heatsink/aluminum on it and voila.

Ralph

 

[Bricolo]

Ralph, you'll have an even worse crosstalk problem! You have long paralleled signals.

If you're stuck with this design, try to add ground lines between every signal lines

But I'm no PCB expert at all

 

[fedde]

What about a compromis !? E.g. a 2x4 or 4x2 configuration !?

Fedde (who is still very happy with his single chip!)

 

[Happy Ears]

Guys , don't let yourself slip into a mudpool ... stacking chips have no Audible dissadvantage at all . believe me in this case !
As long as no one is trying to obtain "proven" audible difference between both solutions ..... this seems to become a never ending story .

I will certainly will not be the one who is gonna try out . I'm not a wishfull thinker but convinced about my stacked tower .

Happy Ears

 

[satelliteman]

Old thread by the looks , BUT - I am about to attempt to modify a marantz CD63MKii .. with the DDDAC1543 MKii ... from Doeud . - I have seen a pic where to take DATA, FS , BCK connections from ... and I have a Linear supply that is adjustable with good filtering / stability . 5 - 11 vdc . What i am wanting to ask is , I gather VB+ is the DC supply connection respect to the GND , BUT , surely the data requires a ground connection , so where do I make a common ground back to the Marantz ... do i just locate the ground for the 5vdc ? and link this to the Linear Supply 0vdc for the DDAAC ? ..or is there a digital ground somewhere ? Im ready to heatup the soldering iron !

 

[satelliteman]

Its all sorted ... I figured that the timing is based from 5vdc logic , so i referenced the DAC ground to the marantz 5vdc com ref ..( 0vdc ) . Works sweet as ! - stunning sound , clearest ive heard . Say NO to NOS today !