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Old 6th May 2003, 01:48 PM   #1
sugano is offline sugano  Hong Kong
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Default Pcm2702 Usb Dac

Has anyone tried this DAC with USB interface? There is a simple USB DAC circuit (http://www-s.ti.com/sc/psheets/sbau025/sbau025.pdf) and I am thinking about assembling that one for my computer. Has anyone here worked with this or a similar project? Any tip from you?


Thanks,
Peter
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Old 6th May 2003, 04:38 PM   #2
MCLL is offline MCLL  Hong Kong
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Here have a Kit and around HKD 190 (PCB + PCM2702).

http://www.keces.com.tw/~korping/diy...6/D0304006.htm

Click the image to open in full size.
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Old 7th May 2003, 08:18 AM   #3
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Yes i made this dac and it is huge improvement over my Yamaha soundcard.
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Old 7th May 2003, 02:25 PM   #4
sugano is offline sugano  Hong Kong
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Default PCM2702

Quote:
Originally posted by borisov57
Yes i made this dac and it is huge improvement over my Yamaha soundcard.
So what you did was to duplicate the evaluation fixture circuit? Did you do any modification other than perhaps not to draw the 5V power supply from the USB?



Best regards,
Peter
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Old 8th May 2003, 07:57 AM   #5
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I made pcm2702 as it was described in elektor magazine and this was copy of evaluation fixture. Power supply is not from usb, but separate transformer and lm7805 regulator. I omited output filter and operational amplifier after dac and take output from dac via coupling cap to amplifier. Someday i may add some sort of output buffer and better power supply.
I also made dac with pcm2906, which is has not as good sound as pcm2702, but has s/pdif in/out.

Best regards,
Borisov57
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Old 8th May 2003, 07:40 PM   #6
audioPT is offline audioPT  Portugal
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Hi!

I've just received samples from TI, PCM2902E and I'm going to make my USB ADC/DAC.

It has analog and optical inputs / outputs.

Regards

Pedro Martins
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Old 26th May 2003, 04:19 AM   #7
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I heard that KECES in Taiwan is going to release their finished product of USB DAC using PCM2702. The actual released date should be end of May.

The case will have a crystal-clear plastic cover. Unconfirmed information regarding parts used in this machine includes power caps - Nichicon KMH, OS-CON and MUSE. Single OP DIP-8 design is used so people can easily swop the OP for tuning. I am curious that almost all resistors look like generic precise resistors except the LPF part uses Dale RN60, wonder whether this is part of the tuning trick.

In the discussion forum it seems like there is going to be a English webpage for this product and can be sold to overseas(the transformer can adapt 110 and 220V by changing internal wiring.)

So for those who are interested, maybe you can observe the progress.

China DIYer also develop a USB DAC PCB by using PCM2702 as well but they are using tube. Unfortunately this is not yet a kit or finished product that is available. http://www.erji.net/dispbbs.asp?Boar...7&star=1&skin=
Happy listening
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Old 26th May 2003, 07:46 AM   #8
sugano is offline sugano  Hong Kong
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Default Tube analogue section for PCM2702

Is there any suggestion for DIY tube analogue circuit for PCM2702?
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Old 26th May 2003, 08:52 AM   #9
MCLL is offline MCLL  Hong Kong
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I think add a Tube Buffer to Output Stage.
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Old 27th May 2003, 07:37 AM   #10
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Just notice KECES's new USB DAC has price now: NTD 3950, roughly around USD 110. Pricewise, not bad. Hope there is more description about the listening test.

Wonder what is the major difference, 12dAX7 cost USD 1600 which is 10+times more expensive and using the same PCM2702 chip.
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