DAC with Four PCM 1704, PMD100, CS8412

gabrielbecheanu · 19th February 2011, 11:32 AM

Hi
A few days ago a friend of mine bring me a DAC with four PCM1704, PMD100 HDCD decoder and CS8412 receiver to listen. This DAC was bought from Analog metric..
The DAC have one S/PDIF and one AES.EBU input,
I made two power transformers but the DAC doesn’t work.
Any one has experience with this DAC?
Any suggestion?
Best regards

pionik · 19th February 2011, 04:11 PM

Quote:

Originally Posted by gabrielbecheanu

I made two power transformers but the DAC doesn’t work.

Hi, check schematics of PSU part for this DAC. I have another model of DAC from this firm and found that they made very strange shematics in PSU - they use the same type of regulators chip to obtain (-) and (+) voltage. Thus, (-) voltage they derived with regulator placed in path to common "earth" on PCB. You need separate second windings (not common earth connection between them) on transformers for EACH voltage on PCB connector, even with eaqual values. After your previous attempt and before new connection, you need check all diods in PSU - some of them already could be broken.

gabrielbecheanu · 20th February 2011, 08:17 PM

Thanks pionik
I just received the schematic diagram and i will check everything from power supply to output stage.
If some one made an improvement to this DAC i would like to know more about it.
I think that this DAC has more to show me after I will make him to work again
I have a DAC with CS4398 from Ebay, i will compare him with this four PCM1704 digital analog converter . I am so curios to see who will win the contest.
Best regards

zerotohero · 29th March 2011, 01:32 PM

How did you get on Gabriel?

Would be interesting to see how it compared with your dac.

qusp · 29th March 2011, 03:15 PM

its not such a strange way to use floating regulators, as long as they inform the customer. in fact myself and a friend are utilizing the same technique with our dac psu. we are doing it for reasons 2 fold. the very high quality linear tech lt1764a regulator does not have a negative pole counterpart of the same extreme high quality, low noise and current capability and we can buy in bulk all the same chip to use throughout all 10 regulated voltages, simplifying layout and allowing bulk pricing on the regs

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20th February 2011, 08:17 PM	#3
gabrielbecheanu diyAudio Member Join Date: Jun 2006 Location: Constanta	Thanks pionik I just received the schematic diagram and i will check everything from power supply to output stage. If some one made an improvement to this DAC i would like to know more about it. I think that this DAC has more to show me after I will make him to work again I have a DAC with CS4398 from Ebay, i will compare him with this four PCM1704 digital analog converter . I am so curios to see who will win the contest. Best regards

29th March 2011, 01:32 PM	#4
zerotohero diyAudio Member Join Date: Oct 2009	How did you get on Gabriel? Would be interesting to see how it compared with your dac.

29th March 2011, 03:15 PM	#5
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	its not such a strange way to use floating regulators, as long as they inform the customer. in fact myself and a friend are utilizing the same technique with our dac psu. we are doing it for reasons 2 fold. the very high quality linear tech lt1764a regulator does not have a negative pole counterpart of the same extreme high quality, low noise and current capability and we can buy in bulk all the same chip to use throughout all 10 regulated voltages, simplifying layout and allowing bulk pricing on the regs

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