TDA 1543 DAC questions - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th May 2004, 03:04 PM   #1
diyAudio Member
 
Join Date: May 2004
Location: Canada
Default TDA 1543 DAC questions

I would like to build a TDA1543 portable DAC to include in my new PPA. Seriously thinking of purchasing the pcb and parts from Scott Nixon, since it's almost the same cost by ordering the chips and BG's from various sources, etc.

Initially planned to build TDA1541 chip, but it seems almost impossible to make a small battery operated setup, since the chip is much more sensitive to power and output requirements.

It's basically my 2nd day of familiarity with non-filtered, non-oversampled DACs, so, please forgive my ignorance.

A couple of questions:


How does Chibi inverting mod degrade the sound in the sonic sense, if any degradation?

Where to get the schematics for Chibi mod? I searched and couldn't find it anywhere.

Will the 8v DC supply to digital section be sufficient to output the signal from TDA1543to my PPA?

Does the CS8414 chip work similar to CS8412 which is no longer recommended by provider? I plan to use Toshiba optical receiver with it. I guess the DACKit accomodates for it?

The notorious low high-frequency 3db drop, how can it be improved?
One solution - using a passive resonance circiut by Thorsten Loesch
way Does anybody have a different solution or the high-frequency drop isn't that bad?

Thanks!
  Reply With Quote
Old 11th May 2004, 11:05 PM   #2
diyAudio Member
 
Join Date: May 2002
Location: UK
Hi
I have recently constructed my first 1543 based dac for portable
use.
Using passive IV conversion and 8v it happily drives my Pimeta
so will have no probs with a PPA.

As for the sound ,probably different from what you are used to,
due to the treble roll off you mention.
I have found that this roll off does make your choice of partnering
equipment somewhat critical.
It sounds rather nice with my Stax 4040 setup and also with the
Beyer DT931 Pimeta combo.


Check out this thread[amoung many others] for info on optimizing the dac:


The ultimate TDA1543 DAC layout??


You can also see mine here:

My first Nos dac is alive!

As for knowledgeable technical input..don,t ask me, I am just muddling along here also


Setmenu

Oh and Try RS components for the 8412, they have them in the UK.
  Reply With Quote
Old 12th May 2004, 01:07 AM   #3
diyAudio Member
 
Join Date: May 2004
Location: Canada
setmenu, thanks for your input. it's always not so easy building something from scratch, little help and experience from others can be very useful.

I already ordered most of my parts from 3 sources, excluding the BG and Oscon caps. The BG are one of the best in the sound path. I'll order them from partsconnexion. Still cannot find them.Anyone can suggest a good alternative to Oscons?

It's only my 4th day of getting familiar with this DAC project, though, i used to built other things in the past. i would like to create a simple prototype first on the breadboard and then try it with other caps, i/v converters, possibly adding gain stage(AD8620 is good here, very neutral).

About the treble roll-off. There's a possible solution using a little resonance circiut to add back the missing 3db in the 18-20kHz region. Here's the schematics Interesting if this would fix the problem. The PPA is very accurate and responsive to get the full range from the DAC. I use OPA637/627 combination and diamond buffer from Larocco is on its way. AD8610 are great too, they should cure the treble roll-off if it's too serious.
  Reply With Quote
Old 12th May 2004, 12:54 PM   #4
diyAudio Member
 
Join Date: May 2002
Location: UK
At first the the seemingly endless choice of approaches nearly stalled me with this project.
So I would definitely recommend you build your first as simple as possible, so you can assess the 'basic' sound and use it as a reference to compare it to further versions.


You mention 'breadboard' for prototyping the first dac.
By breadboard do you mean the plastic moulded plugboard
used for temporarily jigging a circuit together?
If so, I don't think many here would recommend it.

See this thread for some interesting debate on decoupling ,grounding, power supply noise etc:


Optimum Decoupling of Digital ICs

On the subject of Op amps, I have used Bur Brown 634 buffers
with my pimeta and found the sound a little dark,I changed them
for HA 5002 buffers for a more transparent sound.
I mention this because I understand Burr Browns have a 'house sound' that some consider 'dark'.
If this is the case ,you may indeed prefer the AD8620/8610 sound.


Cheers

Setmenu
  Reply With Quote
Old 12th May 2004, 02:46 PM   #5
diyAudio Member
 
Join Date: May 2004
Location: Canada
Actually, I shouldn't have said breadboard, you're right... it's the plastic thingy with plug-in holes to do a quick and dirty assembly. I meant to use the prototype board, just like Peter Daniel did on his setup. The grounding is a big issue with digital.
  Reply With Quote
Old 12th May 2004, 07:18 PM   #6
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
Quote:
Originally posted by IpsilonSound
.Anyone can suggest a good alternative to Oscons?
Don't use those lower grade OsCons. I never liked them. BGs are much better.

If you still want to try OsCons I have few values I can sell to you, mostly 47u, 22u and 150u. They really sucked
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 12th May 2004, 08:05 PM   #7
diyAudio Member
 
Join Date: May 2004
Location: Canada
No, thanks Peter, I'll take your word on that one... Besides, I've ordered a few BG FX 220uF caps this noon, hope, they shouldn't be too large though

Still many areas of unawareness for me regarding parts selection...

For instance, Wima is hard to get, what would be the same quality cap for it? Maybe BC?
  Reply With Quote
Old 12th May 2004, 08:36 PM   #8
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
I think Panasonic P-series caps (from DigiKey) would be much better than Wimas.

If those are too big, they have also smaller versions of polypropylene film caps.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Diy-dac 1543 Tolu Digital Line Level 112 9th September 2009 01:20 PM
first try cd-rom + 1543 dac senderj Digital Source 17 29th September 2006 02:37 PM
TDA 1543 - How hot? pixpop Digital Source 11 12th January 2006 10:37 PM
Tda 1543 Chris Digital Source 5 23rd October 2003 11:39 PM


New To Site? Need Help?

All times are GMT. The time now is 03:46 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2