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Old 24th January 2013, 02:50 AM   #171
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...thank you for your blog. You should be mightily pleased with that - a quality blog.
+1 - especially appreciate all the eye-candy - digital audio pr0n
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Old 24th January 2013, 04:39 AM   #172
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honestly, just go with synchronous clocking and be done with it.

they have a 100MHz Epson SAW at digikey make sure to get the CMOS version. they apparently do a 98.304MHz sop you could at least have synchronous 48x

3ps RMS and a quite large 25ps peak to peak jitter.
The journey IS the destination...
For 3.3V clocks, only the 75MHz and the 106 MHz are available.

The only reason I bring these up is because over at the other thread, side by side listening comparison, listeners preferred the BII with the saw clock to the one with the cchd clock.
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Old 24th January 2013, 04:54 AM   #173
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...

BTW, your Arduino pages make that look really easy - is it ? What do people usually struggle with ?


...

Cheers
I think the hardest part is familiarizing with the Arduino environment (which is actually pretty easy). I don't get many questions. Most implementations "just show up" in some forum or blog :-)
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Old 24th January 2013, 05:00 AM   #174
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..
Did you decide on op amps yet ? I've settled on LME49990 for the buffers but still trying op amps for the I/V.
...

Cheers
I was thinking of first using the DAC in voltage mode single ended by flipping the phase of the second set of DACs and summing it with the first set (thus having 16 DACs per channel in SE mode). And then also try the passive filter from abraxalito.

Have a set of OPA627 somewhere in the closet that I will try.
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Old 24th January 2013, 06:20 AM   #175
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I was thinking of first using the DAC in voltage mode single ended by flipping the phase of the second set of DACs and summing it with the first set (thus having 16 DACs per channel in SE mode). And then also try the passive filter from abraxalito.

Have a set of OPA627 somewhere in the closet that I will try.
the above would defeat ALL of the careful routing, all of the CMRR. I would expect less than 90dB THD+N
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Old 24th January 2013, 06:26 AM   #176
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umm I have a result for CMOS 3v3 SAW 100MHz right in front of me, the one I linked you to. here they have 878 of them at 3.72 each. maybe yopu mean a different model?

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The only reason I bring these up is because over at the other thread, side by side listening comparison, listeners preferred the BII with the saw clock to the one with the cchd clock.
sorry I cant say I place much stead in this audible comparison, a controlled test I suppose? yet another magical unknown specification that science forgot; yet brings audible levels of improvement when it comes to music listeners. Dark Jitter....people have been saying they prefer clocks that are clearly borderline browning out their dacs as well.

but like I said go for your life its cheap.

I can see it (the 100MHz or 98.304MHz) as a viable alternative if you dont want to blow the money on a crystek or better, I really can, they seem reasonable for the money. We are talking about a clock here, if it had other harmonics, they would be part of the jtest, so unless people prefer more error like they can prefer distortion, then it hurts my head to think of why you could prefer something worse.....and it is worse.

it seems to measure about the same, or a bit worse than the generic place-holder clock in the fifo kit

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Old 24th January 2013, 06:49 AM   #177
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The only reason I bring these up is because over at the other thread, side by side listening comparison, listeners preferred the BII with the saw clock to the one with the cchd clock.
They're making the same noises over on the Oppo 105 thread too - SAW subjectively trumps the more expensive Crystek, despite measuring worse. I'm curious to understand why
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Old 24th January 2013, 06:50 AM   #178
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They're making the same noises over on the Oppo 105 thread too - SAW subjectively trumps the more expensive Crystek, despite measuring worse. I'm curious to understand why
yes, the same few (2?) people are making the same noises, one of whom uses it in his clock module upgrade....
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Old 24th January 2013, 06:52 AM   #179
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Long-range scanners are reporting a rapid build-up of cynical expectation bias captain...
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Old 24th January 2013, 07:03 AM   #180
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that would be fair, especially since the spruking of said commercial modules is a kind of sport in that thread.

but really, where is this unknown variable that makes the timey wimey machine more timey wimey-er?

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