DAC with DIR9001 & PCM1792A (fist digital project) - Page 2 - diyAudio
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Old 4th March 2008, 12:34 AM   #11
kevinkr is offline kevinkr  United States
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FWIW, and I am not totally sure about this, but I suspect the diode from the input circuit back to the input is reversed. Simulations indicate it works much better that way, but overall I'm uncomfortable with this circuit - I think a high performance comparator might just be better.

The Zhaolu 2.5A I have been tweaking uses a very similar input receiver, and I suspect its performance leaves something to be desired particularly at higher sample rates where the performance of the dac seems to degrade. This is idle conjecture, until I get in there with my scope and look around I can't say for sure.
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Old 4th March 2008, 12:41 AM   #12
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by leon
I'm still expirimenting so I'm not confident enough to publish my design.

If you noticed I use 74HCU04 but I also included a voltage comparator to expiriment with in the input stage.
You might want to consider sharing it anyway, some of us might see things that you can improve and we might also learn something as well.

Somewhere around here is my old dac thread, the dac unfortunately was stillborn.. I'm currently tinkering with the Zhaolu and buying some boards from Twisted Pear Audio. Their spdif receiver module uses the Wolfson WM8804 spdif transceiver module which is both a rather good receiver and includes a transmitter module - it can even be used for reclocking the spdif data stream if desired.
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Old 20th November 2008, 08:38 PM   #13
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Does anyone have any updates on their project?

I would also like to build a DAC with DIR9001->PCM1794A but I have no experience with digital. I have plenty of these IC to offer if someone can help get me started.
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Old 29th November 2008, 12:41 AM   #14
Telstar is offline Telstar  Italy
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Default DIR9001 vs WM8804

Quote:
Originally posted by theAnonymous1
Does anyone have any updates on their project?

I would also like to build a DAC with DIR9001->PCM1794A but I have no experience with digital. I have plenty of these IC to offer if someone can help get me started.
Anybody has compared DIR9001 vs WM8804 in the same dac?
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