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Old 28th November 2004, 03:45 PM   #1
gravir is offline gravir  Hungary
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Default PCB need for TNT-convertus DAC

Does anybody have a pcb design for the TNT-convertus DAC?
http://www.tnt-audio.com/clinica/convertus3_e.html
Or something with TDA1543? (I need schematic, and pcb.)
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Old 28th November 2004, 07:22 PM   #2
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http://www.scott-nixon.com/dac.htm

http://www.diyparadise.com/dackit/dackit.html

both NOS 1543-based DACs
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Old 28th November 2004, 08:51 PM   #3
gravir is offline gravir  Hungary
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Thanks!
But I prefer to bulid that schematic I linked, I'd like to use more than one DAC, thats why the schematic made by Pozzoli looks good.
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Old 29th November 2004, 07:26 PM   #4
glt is offline glt  United States
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Default How about DAC-AH

http://eshop.diyclub.biz/index.php?cPath=23_135

I just got one, very easy to mod. I can mail you the schematics if you wish...

Regards,

Guillermo
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Old 29th November 2004, 07:45 PM   #5
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I remember reading a little about these a while ago...
can someone refresh me on why multiple dac chips is such a good idea?
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Old 29th November 2004, 08:23 PM   #6
ble0t is offline ble0t  United States
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By paralleling the chips, you can decrease noise and non-linearities (which are at different points for each chip). Think of using a water filter, and running the same batch of water through it 4 times instead of just once...chances are you'll have 'cleaner' water

Also, it improves the ability of the DAC to drive longer interconnects if you have them.
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Old 29th November 2004, 09:16 PM   #7
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Look up Doede Duama or search for dddac 1543 on the internet
Doede has boards chips and clocks...you can build an 8 parrallel 1543 for around $100
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Old 30th November 2004, 10:37 AM   #8
gravir is offline gravir  Hungary
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Nobody built this DAC?
I'm too lazy to draw it...:-)) But it seems I have to...
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Old 3rd December 2004, 07:18 PM   #9
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Default build the TNT DAC

hello gravir,

I build this dac a few months ago, well, actualy finished it a few months ago.
I started out when it was publiced at the TNT-site but through the process of building it, I changed the configuration.
In the end I did not build 3 different PSU's but only two. One is supplying 12V which feeds all the TL431 for the 5V logic. The second one is running on 8.6V and is supplying the four TDA1543's.
Lateron I also added reclocking which is worth to implement. I used a Tent clock and a 74HCT174 to reclock all the lines. The only thing I like to change are the output caps which are now some WIMA MP3's coming from an old PSU...

I build the whole thing on breadboard and hard-wired it myself, no pcb used. It takes some more time but it's not too hard to do.

At the moment I'm thinking of building different (active) output stages as posted by Rudolf Broertjes e.a. to compare them. There seems to be some pro's and con's (soundwise) but it's best to find them out yourself.

So I wish you good luck with building this baby, unfortunately I don't have any pictures (yet) to show you how I build it but if I do, I'll post them here.

Chris


P.S. I noticed that during 24 hrs my supply voltage for the TDA is not realy stable... it shifts some 0.1V during the day which makes it impossible to adjust to an exact 8.8V. Anyone had problems with this too? I build the PSU as described at the TNT-site.
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Old 7th December 2004, 11:44 PM   #10
Giorgio is offline Giorgio  Italy
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Gravir
sorry, no PCS available from me too.

Rhinobirds,
the voltage should be around 8.8 for best performance. it is not a issue if it goes down to 8.7. Can be an issue if goes over 8.9, it is the AMSOLUTE MAXIMUM RATING for the chip, and even though apparently there is a little margin, be very very careful....

Having four DACs in parallel reduces noise, but has some not positive effect on treble. However, to have 4 in parallel in Convertus also allows to spare an output stage with gain.

Giorgio
(giorgio@tnt-audio.com)
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