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mains ps for DDDAC?
mains ps for DDDAC?
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Old 27th October 2003, 10:09 AM   #1
rwagter is offline rwagter
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Default mains ps for DDDAC?

I just ordered a PCB for doede's dddac:

http://www.dddac.de

all voltafe regulators are on the PCB itself. Doede uses a battery as a powersupply.
I'd rather use a regular PS directly from mains (220V). The ultimate questions always is how to get a clean 12V to the regulators.

My first thought is use a regular 2x9V toroid with LCLC filter to get clean 12V for power to cs8412 and the clock and use a seperate supply also with LCLC filtering for the TDA1543.

Am I making any sense doing this.
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Old 27th October 2003, 11:36 AM   #2
Andypairo is offline Andypairo  Italy
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I also plan to build (as soon as I receive the TDA1543 I ordered) a DAC similar to Doede's (even if I will probably use Elso's Asynchronous reclocker), without battery.
I was thinking about a CLC filter followerd by a 7812 for each 5V supply and a more elaborate (taken from the "Convertus") discrete PS for the dac itself.

Cheers

Andrea
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Old 27th October 2003, 12:10 PM   #3
rwagter is offline rwagter
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Andrea,

you mean this one ?
Click the image to open in full size.

It looks simple enough. Why don't you use the complete PSU from tnt?

Ralph
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Old 27th October 2003, 12:45 PM   #4
Andypairo is offline Andypairo  Italy
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I wanted to experiment a little and using local shunt regulators like the TL431 ( did I forget to mention them ? )allows me to choose whether using a separate supply for the analog and digital supplies or not (and eventually to re-use the receiver section with a 1541).
The DAC supply instead had to be variable since everyone seems to have a preferred voltage to feed the 1543...

Cheers

Andrea
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Old 2nd November 2003, 05:46 PM   #5
Lucas_G is offline Lucas_G  Netherlands
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I too would like to build the Doede Douma Dac with a mains-PSU instead of battery.

I am thinking of using the PSU that Fabian describes in this thread:
http://www.diyaudio.com/forums/showt...threadid=22152

I also posted a question there about the neccesary changes to stuffing the DDDAC PCB when using the Fabain PSU...

Maybe someone can advise on this?

Regards,

Lucas.
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Old 2nd November 2003, 06:35 PM   #6
Happy Ears is offline Happy Ears  Netherlands
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Arrow battery advantages

Hi . I don't see the advantages of building this DAC with regular power supply .. note that you need to arrange very clean 5 volt for the XO too ..

I compared both solutions and finaly dicided to go on with the battery .. it's far better . more relaxed sound , quiescency etc.

Just an opinion !

Happy Ears
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Old 3rd November 2003, 07:18 AM   #7
Lucas_G is offline Lucas_G  Netherlands
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Default Re: battery advantages

Quote:
Originally posted by Happy Ears
Hi . I don't see the advantages of building this DAC with regular power supply .. note that you need to arrange very clean 5 volt for the XO too ..

I compared both solutions and finaly dicided to go on with the battery .. it's far better . more relaxed sound , quiescency etc.

Just an opinion !

Happy Ears
Hi Happy Ears,

So you did a comparison on sound-quality?

I considered the Fabian PSU solution because I thought it would be more convenient. However if the battery-solution sounds substantially better, I will go for battery.

I wondered though how good the LM 317 T is?
Doesn't these regulators themselve produce noise?
Don't they need better filtering after them?
Are there any better alternatives?

Regards,

Lucas.
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Old 3rd November 2003, 07:30 AM   #8
Bas Horneman is offline Bas Horneman  Netherlands
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Like Doede says on his website..the LT 1085 is a good alternative..

Cheers,
Bas
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Old 3rd November 2003, 08:28 AM   #9
Lucas_G is offline Lucas_G  Netherlands
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Quote:
Originally posted by Bas Horneman
Like Doede says on his website..the LT 1085 is a good alternative..

Cheers,
Bas

Hi Bas,

I saw that the LT 1085 is ten times more expensive than the LM 317.
Is it indeed a lot better?

Lucas
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Old 3rd November 2003, 03:24 PM   #10
Bas Horneman is offline Bas Horneman  Netherlands
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Hi Lucas,

The short answer is : "I don't know"

Hopefully someone in the know will reply to your question...

But I seriously doubt it is 10 times better?

I don't know if they are the same...but I am going to use a LD 1085 as opposed to a LT 1085..


The LD 1085 is $1,30 at mouser...

Cheers,
Bas
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