With an oversampled ADC (which virtually all soundcards use these days),
do you really know when a sample was taken?
For the traditional ADC that used a sample and hold followed by
successive approximation, you knew the moment of sampling. For MASH
converters, I'm not so sure.
For high accuracy spectral analysis, the 10MHz scheme should be better
than a stock soundcard.
On 7/6/2012 12:40 PM, Tristan Steele wrote:
Another option is to do it yourself, it is one of my projects that is currently
in progress. I have some early information at:
http://electronics.ozonejunkie.com/category/electronics/time/10mhzaudio/
I am aware that the jitter will not be all that low, but I was more interested
in longer term stability. I have since made a smaller, neater board that just
needs to go through some testing. If there is interest, I can post schematics
up in the next few days.
Tristan
On 06/07/2012, at 20:13, li...@lazygranch.com wrote:
I'd suggest hacking USB type soundcards. It is certainly easier to get at the
guts.
There is a Chinese card peddled by a few vendors on ebay that comes in a blue
metal case. You can slip out the PCB. The card uses CMedia chips.
This is the first one I spotted on ebay:
http://item.mobileweb.ebay.com/viewitem?itemId=280506784055&cmd=VIDESC&index=19&nav=SEARCH&nid=33879388392
I have an older version. These CMedia based cards work well under ALSA.
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