TDA1543- How many to use?

Dr.H · 11th February 2003, 08:56 AM

All,

I have 16 TDA1543's available for use. What is teh optimal number for teh zero-oversampling DAC everyone raves about?

Should I use all 16 and get better signal/noise ratio?

Would one CS8412 still suffice for all 16?

Would I need to reclock for each TDA1543 (i.e. 16x 74hc74) or can I simply place one 74hc74 between the CS8412 and the 16 TDA1543?

Is the TDA1543 best run at 5V or 8V?

Thanks for helpful hints!
Ryan

Elso Kwak · 25th February 2003, 02:27 PM

Hi Ryan,
In my experience one is the optimal number for the TDA1543.
The high's get kind of smeared when pallelling TDA1543's. Also I like +5V supply the most. I posted a schematic that I liked best.
If you are asynchronously reclocking it is best to use two flip-flops in series to countermeasure the metastability effect. See Feddes site for the idea. Click on the schematic of the DAC. Best use 74VHC74 (two flip-flops in one package. )

http://home.student.utwente.nl/f.s.b...dio/nonoz.html

rfbrw · 25th February 2003, 09:36 PM

As another option you could use one stereo pair per channel in a balanced configuration i.e. one device per channel.

ray.

Zelko · 6th March 2003, 11:46 AM

I prefer 3 paralleled, the best distorsion spectrum, dominant second, a bit of third and that's all.
The same has been confirmed on listening tests.
One only is a bit crude, rough in highs and a lot of 3rd harmonic.
Try different biasing and load resistors.
Good luck,

11th February 2003, 08:56 AM	#1
Dr.H diyAudio Member Join Date: Apr 2002	TDA1543- How many to use? All, I have 16 TDA1543's available for use. What is teh optimal number for teh zero-oversampling DAC everyone raves about? Should I use all 16 and get better signal/noise ratio? Would one CS8412 still suffice for all 16? Would I need to reclock for each TDA1543 (i.e. 16x 74hc74) or can I simply place one 74hc74 between the CS8412 and the 16 TDA1543? Is the TDA1543 best run at 5V or 8V? Thanks for helpful hints! Ryan

25th February 2003, 02:27 PM	#2
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	TDA1543 Hi Ryan, In my experience one is the optimal number for the TDA1543. The high's get kind of smeared when pallelling TDA1543's. Also I like +5V supply the most. I posted a schematic that I liked best. If you are asynchronously reclocking it is best to use two flip-flops in series to countermeasure the metastability effect. See Feddes site for the idea. Click on the schematic of the DAC. Best use 74VHC74 (two flip-flops in one package. ) http://home.student.utwente.nl/f.s.b...dio/nonoz.html

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25th February 2003, 09:36 PM	#3
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	As another option you could use one stereo pair per channel in a balanced configuration i.e. one device per channel. ray.

6th March 2003, 11:46 AM	#4
Zelko diyAudio Member Join Date: Mar 2003 Location: Zagreb	I prefer 3 paralleled, the best distorsion spectrum, dominant second, a bit of third and that's all. The same has been confirmed on listening tests. One only is a bit crude, rough in highs and a lot of 3rd harmonic. Try different biasing and load resistors. Good luck,

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