Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 123 - diyAudio
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Old 19th October 2012, 05:18 AM   #1221
NicMac is offline NicMac  Italy
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Old 19th October 2012, 05:25 AM   #1222
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Old 19th October 2012, 06:36 AM   #1223
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Old 19th October 2012, 08:42 AM   #1224
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Old 19th October 2012, 08:46 AM   #1225
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Ian,

You are an exception to none, one of the most valuable members of the DIY community.

Thank you!
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Old 19th October 2012, 08:47 AM   #1226
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Old 19th October 2012, 09:31 AM   #1227
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Old 19th October 2012, 10:47 AM   #1228
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Default So, how bad are the supplied clocks?

Finally put together a test bed: a modified exaU2I via I2S FIFO to Buf 3. As the EXA already has a FIFO and i feed its onboard clocks from a separate regulator, it is not a likely candidate to benefit from the FIFO board.

Still, the reduction in quality with the additional FIFO board in the picture is obvious. My setup is far from ideal - both inputs and outputs to the FIFO board pass through the 7-pin connectors and there obviously is some additional wiring; atm i am using the supplied clocks on the DualXO board and they do not get a dedicated power supply but rather use the 5v output from the FIFO board.

I realise all of these contribute to the audible deficiencies but before switching to mini bnc and sorting out a dedicated regulator for the clocks i would like to ask the obvious: are the supplied clocks just too poor to even bother listening through them? Should i order Crysteks, or wait for the Si570 or try something else?
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Old 19th October 2012, 10:52 AM   #1229
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Quote:
Originally Posted by analog_sa View Post
I realise all of these contribute to the audible deficiencies but before switching to mini bnc and sorting out a dedicated regulator for the clocks i would like to ask the obvious: are the supplied clocks just too poor to even bother listening through them? Should i order Crysteks, or wait for the Si570 or try something else?

Interesting test setup!


IMO, yes, the supplied clocks are not for listening, just to check that it is operational. The CCHD957 would be my choice. ATM the Si570 is a mere pipedream that may become available in the future if we find another ~30+ people interested.

Are you connecting as sync or async to the BIII?

I would change the clocks before changing the PSU to the dualXO board. Actually Ian this is a question I had been thinking about a little, how much benefit is there likely to be by simply supplying a separate low noise 5V reg (in my case probably sjostrom super reg) to the clock board? I understand that we need to remove L11 before connecting this reg. My problem becomes more complicated because I only have one transformer so all supplies are still coupled there.

Last edited by hochopeper; 19th October 2012 at 10:55 AM.
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Old 19th October 2012, 10:55 AM   #1230
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Async atm. Thanks for the advice, will order the Crysteks
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