Valab Non-Oversampling USB DAC using TDA1543 --- Ultra low jitter version with dual 1ppm tcxo inside

 #11 Revision version with Re-clock and Indenpendent Power Supply Version

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Why non-oversampling DAC?  ------  'oversampling'  kill music!
  
    You may not know, the actual digital signal recorded on your CD title is 16bit/44.1k format. Yes, never doubt it! Then why almost all modern DAC feature 24bit/96k or even 192k specification? In modern digital recoding studio,  music will be recorded in new 24bit/192k format but when they need to 'write' onto CD, these information rich formation must be degraded into old format. These 'New' DACs will try 'restore' the degraded back to more informative format using some talent algorithm work out by smart mathematician. ----- That is problem!  why? All music you hear from CD will be processed by some smart algorithm, then you hear the artifact sound ---- actually bad sound!

   My over-opinion? No! If you are a experienced audiophiles, you will find if these cd players or DACs use the same dac chip inside, they all will have very closer sound features, even their analog circuits designs are quite different. Why? You hear the same artifact derived from the same talent algorism.   
 
  These artifacts contamination did hurt your audio enjoyment! Why, they mask real tone color and even 'atmosphere' of music player.  You do not believe!? Try to find CD records which also have vinyl LP version, compare music from vinyl and CD. You will know how bad these artifact sound is!

Back to vinyl record?
   
   No! Vinyl LP really too troublesome! Listening music should be easy and relaxing.

Non-oversampling DAC is a compromise answer.
   
   NOS-DACs may be an acceptable answer to CD music. Why? No artifact anymore from these NOS-DACs. You get non-refined music recorded on CD although it is still a degraded music. But in my experience, it is still much better than artifact juck.
  Why? 'modern' dac can not De novo generate right music signal from degraded records on CD, but rather add mathematical generated fill-in bits into your music. 
  So NOS-DAC is a can-not-but choice!


VALAB NOS-DAC TDA1543 --- simple elegance
   
  All NOS-DACs are simple. because these old NOD dac chips are so small and simple IC with few pins and only need simple circuit to work well.

  TDA-1543 may be the most small but tough one. It is a real vintage chip developed by Philips 2 decades ago. We choose it to implement our own  NOS-DAC.

  No special innovation on this chip for it is too simple. What we should do is try to extrapolate its most potential! How?
 
1. Keep most accurate digital signal and feed to TDA1543 in low jitter fashion.
    DIR9001 digital receiver is the answer for this propose. DIR9001 is a new modern IC, much more expensive than that popular CS8412/4/6 used in all other DAC. Much more music details keep and accurate sound you obtain.

2. Paralleling DAC chips.
    We parallel up to 8 TDA1543 chips as you see on Fig. 4.  8 paralleling did enhance performance, get better resolution and lower output impedance. 

3. Profuse power supply
    30W sealed military grade power transformer was used in this DAC, it can offer up to 15 times required electronic power. No vibration, heating from this transformer. In rectification circuit, we use best sound 1n5062 diode, this is most credit diode which is popular in audio tweaking. It do signicifantly improve sound quality, more smooth and natural sound. Expensive LT1084 5A voltage regulator and Rubycon capacitor were used in power supply section to offer clean and low drop voltage to tda1543 and dir9001 chips.

4. USB receiving for somputer based source
    We incoporate USB receiving capicity to our new version of 1543dac. Unlike other USB dac use pcm170x chip which integrate USB reciving and dac in one chip, which is very low cost and low performance. Our approach of USB DAC use very decicate design, using independent USB recieing chip and get I2S digita; signal feed into TDA1543 chip.

5. Precision Clock
    In order to get best quality digital signal for TDA1543 chip, we integrate independ precision clocing and redata circuit for digital reciving. You will nerver find any commercial NOS DAC have so dedicate digital design. No matter what price they sell! We inverst our best efforts to extrapolate potential of TDA1543 chip. Our implementation may be best TDA1543 based DAC in market.
We custom order 1ppm 12.0000Mhz TCXO for our most update version to fulfill our promise for building best sound NOS DAC.
In Figure 3, 4 and 8 are our new expensive precision 1ppm 12.0Mhz TCXO, it will be basel part in this dac.
This muxt be most effective and expensive upgrade we ever applied on this product. 
 
6. After several month of selling this dac, we accumulate many know how in parts choice from our customers. Key components usage list below.
    a.  First stage filtering capacitors: Three Rubycon XYF 1000u/35v Long Life/Low impedance 105 degree C tolerance
    b. Decoupling capacitors for digital circuit chips: Eight PSC-470uf 16V solid polymer (os-con) Low ESR/Low impedance 105 degree C tolerance   http://www.chemi-con.com/files/PSC.pdf
    c. Decoupling capacitors for TDA1543 chips: Eight NEC TOKIN 10uf/25v SMD type capacitors, one for each tda1543 chip
    d. Adjustive capacitors for voltage regulator: Two Rubycon XYF 25uf/25v Long Life/Low impedance 105 degree C tolerance
    e. Analog output output capacitor: Two metal can Tantanium 10uf/16v
    f. Digital input coupling capacitor : Two metal can oil filled 0.01uf/200v

7. 2009 new version with new layout by Taradac research group, significantly shorten signal path and use chassis chassis as heatsink, it will have much better heat dissipation efficiency, keepping dac chip cooler and long time stable. 

8. New 2009 March version without clipping/distorsion in high output digital records.

9. New re-clock circuit was added on this dac. I2S bus data from both cm108 usb receiver or dir9001 (both usb and spdif signal) was re-clocked and then feed into dac chip. This re-clock module use 1ppm 33.8688 tcxo and indendent power supply voltage regulator to get best recolck performance.

10. Independent power supply, removing power transformer, volatge regulator out of main circuit chassis. Vibration, noise and heat genarated form power supply section now completely isolated from dac main circuit.

This dac may be most quiet tda1543 based dac in the world. We hear nw hiss, no hum from out 100db/1w speaker.

This simple and small NOS-DAC do have most delicate design and very very good parts choice. You can take it to compete other much much expensive DACs of your friends. You will be very happy.

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Shipping Worldwide: This product will be shipped by EMS air express with on-line tracking and insurance.

Combined shipping fee for multiple items of all my products is welcome and will save you lots of shipping fee.  Please query me before your bidding.

We have both 100/120v US version and 220~240v EU version, please assign which one you need after your order. 

Feedbacks Listing:
Received DAC & Power Supply, very well packed, super fast service!!!!!!!!!!!
   Valab TDA1543 NOS USB Re-Clock DAC Independent Power (#290414034766)  admixman ( 69)

Item was just as described and shipped very quickly. Great Seller!
   Valab TDA1543 NOS USB Re-Clock DAC Independent Power (#290402670282)  sprinter1104 ( 84)

Great product, great price, quick delivery. Perfect xaction. Thanks!!!
   Valab TDA1543 NOS USB Re-Clock DAC Independent Power (#290402670282)  dodge258 ( 316)

Product and seller very good and reliable.
   Valab TDA1543 NOS USB Re-Clock DAC Independent Power (#290405796816)  lalex001 ( 38)

Amazing dac, sounds hi-end for the excellent price, recommend to all interested!
   Valab TDA1543 NOS USB Re-Clock DAC Independent Power (#290369155094)  mel.k.r ( 127)

All is has reached in the best possible way! It is pleasant to deal with you! Th
   Valab TDA1543 NOS USB Re-Clock DAC Independent Power (#290369155094)  opa0772 ( 95)

very good. klasse Gerät, klanglich weit über dem aufgerufenen Preis.
   Valab TDA1543 NOS USB Re-Clock DAC Independent Power (#300354149865)  apolyth ( 496)

Outstanding bargain, fast shipping, perfect transaction, highly recommended!!!
   Valab TDA1543 NOS USB Re-Clock DAC Independent Power (#300354149865)  chadstone ( 36)