Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: What's next?

24.25.149.44

Posted by BFitz on July 25, 2000 at 18:17:21

In Reply to: Re: What's next? posted by Dave I on July 25, 2000 at 12:21:30:

Hi Guys

First, Dave, what electrolytic caps do you like that are still available to buy somewhere? I always thought the bigger Panasonic HF caps were better myself, but never took it too far. Some swear by low ESR, but I would think dielectric absortion would be a pretty good way to judge these. I was looking at the Jung - Curl test method in TAA from '85 this week and wondered if anyone else ever uses that?

Suggestion for tenor39 next steps - upgrade the transport clock. Don't know what you have done there, but if possible, upgrade it to a separate clock with it's own regulator. Then use a flip flop (74hc74) to reclock the spdif output with this new clock. From my testing, these steps remove quite a bit of data correlated jitter that originates in the transport. I can't give you a schematic or more details, but can tell you G&D transforms sells both clocks and output reclocking boards for most transports.
More effective, but possibly more difficult to achieve, as Dave mentioned is to add a 2nd stage PLL to the DAC. I don't know anyone selling kits to do this, and am not aware of any published designs on the web either. This is very DAC dependent, and to do easily will only work with one frequency(i.e. 11.2896MHz), so if you need both DVD-A and normal 16 bit CDs, this won't work.
Another possibility is to install the transport clock in the DAC, and feed it back to the transport. Or easier yet, run the transport clock (the new high quality one) to the DAC
The idea then is to use this transport clock to reclock the critical timing line right before the DAC. Your DAC is now nonstandard, however. I think this is a pretty cool solution, though, and it is a shame transport/DAC designers have not offered this as an option (clock in / clock out ports). We see this all the time in the world of test and measurement, with counters and so on...
Bob

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