The gain of the DI/O outpur filter is easy to calculate (without the speadsheet). It is simply R13/R14 (refering to the dio schematic), so for the standard...
Thanks for the info. However how can we account for lower voltage in the two dio. our gain should be 1.66 and output of about 3V, but the sound level is...
I havent done it yet, in the process of getting a 22.579Mhz vcxo from valpey fisher. The reclocking of the BICK and LRCK of the DAC with a low jitter clock...
Amir, I don't think the preamp input impedance is the problem - it would have to be 220 Ohms to lose 1/2 the signal level (assuming the 220R resistors R7,9 are...
hey amir, lemme know what ya find out - perhaps my di/o's board is silkscreened wrong the same as yoour! and, perhaps, having -3db at 99khz instead of 67khz...
Doug, I don't think the hiss will be from the filter - you couldn't hear it - but it is because of lower gain and threrfore lower signal to noise ratio. I...
You may want to knock it down a tad more than that, as the 8024's internal processing can overload with smaller signals as well (depending on how you have the...
Just curious. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1392487885 (Pls don't hesitate to bid on them if you want them, I don't have the funds for...
Valpey Fisher makes oscillators http://www.valpeyfisher.com/Main/AboutUs.asp. If you do a stock find on their web site and do a part search for 22.5792( use...
Longer term listening using a high capacity transformer (2.8A or 5.6A unit made in China with model# ED22273 ) to be less muscially satisfying with a broader...
in the main board the the SPDIF in/out ground is shown to go to pin J! 8 whtich is +5V on digital board / according to the table on Cfrasier site and marking...
Does not connecting the WORDCLK cause a problem with the dio sync. I did a prototype of dio and left wordclk unattached and could not get a sync. Maybe I...
I have purchased a second DIO (after prematurely retiring the first in a freak stand alone mod accident). I think I will take more time to analyze each tweak...
In my system and using a Cousin Dupree cable (Belden double shield etc) when I changed the 100R digital input resistor to 75 Ohms the sound became very...
... There is that little error on the main board schematic, and then the ones re the analog outputs on the digital board schematic. That's why I put the...
in the web site you indicate that the gain is "Rfb/Rin" but in Expt-3 Rfb is 1K and Rin is 12K but you show gain of 1.833. Can you you explain what else is...
Here's what a reliable source told me recently (someone who thinks the ... I'm still in the infant stage of modifying mine, and since the di/o is both my first...
Amir, I swapped Rser and Rfb values by accident...thanks for spotting the inconsistency. I have corrected the sheet and Expt 3 reads as Rin=12k, Rfb=20K and...
I have been following this group since buying 2 Di/O's a couple of months ago, and planning my mod's. I am wary of changing components and then reversing the...
Ron, Having two DI/Os makes you a good "control' for evaluating the individual effects of mods. I am in the same position by virtue of my friend having bought...
I was quite surprised to see a much different DIO when I opened the new one up last night. My first DIO had a "molded" plastic ribbon cable, my new one a ...
My original DI/O had a paper sticker on the digital chip with a version number on it (something .01 if I remember correctly). The second DI/O I bought didn't ...
I did connect the digital and analogue grounds together and twisted the pair of wires that goes to spdif in and it fixed the problem with sync. I had only one...
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