Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz - Page 110 - diyAudio
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Old 28th January 2015, 12:19 AM   #1091
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Any word on when to expect the documentation?
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Old 28th January 2015, 01:07 AM   #1092
rol is offline rol
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Quote:
Originally Posted by TNT View Post
Playing via opto Toslink and SB Touch.

//
How do you wire the optical cable? Cut off one head andbmake a jumper to spdif2? I am not using the SB, butbthe Airport Express, so would be great if you could post a photo how you wire it.
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Old 28th January 2015, 01:53 AM   #1093
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Some pot options from Digikey depending how much you want to spend...

987-1326-ND
95A1A-B28-B15L-ND
480-5885-ND
308N103-ND
CT3038-ND

There are lots more similar. RS will have choices too.
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Old 28th January 2015, 03:09 AM   #1094
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Quote:
Originally Posted by TNT View Post
Yes but only when you turn the pot

//
The unturned pot makes no noise

(unless it's completely buggered, then all bets are off)
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Old 28th January 2015, 03:18 AM   #1095
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Quote:
Originally Posted by rol View Post
How do you wire the optical cable? Cut off one head andbmake a jumper to spdif2? I am not using the SB, butbthe Airport Express, so would be great if you could post a photo how you wire it.
Is it comedy hour at diyaudio?

assuming not....

You need a 3.3V TOSLINK RX module - wire as per data sheet to a clean 3.3V supply.
Then run a wire from the output pin -> SPDIF2 input.

Toshiba TORX147 is one of the better options but has been out of production since 2008. They can be found without too much difficulty on that auction site.

Quote:
For systems which incorporate TOSLINK, Toshiba recommend testing using the actual device to check its noise resistance.

Use a simple noise filter on TOSLINK fiber optic transceiving module's power line. If the ripple in the power supply used is significant, reinforce the filter.

The optical module is to be used in an area which is susceptible to radiated noise, increase the shielding by covering the optical module and the power line filter with a metallic cover.
Attached Images
File Type: png TORX147.png (78.9 KB, 768 views)
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Old 28th January 2015, 05:46 AM   #1096
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Is possible bypass the digital filter and exclude the oversampling in this DAC module ?
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Old 28th January 2015, 08:23 AM   #1097
ristar is offline ristar  Singapore
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Quote:
Originally Posted by audiodesign View Post
Is possible bypass the digital filter and exclude the oversampling in this DAC module ?
#828

Here's is Soren's post about this. He doesn't advise it but it's possible.
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Old 28th January 2015, 11:13 AM   #1098
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Just some data points with this DAC. My measurements are with Juli@ sound card. First image is a measurement of ESS9018 DAC just to show measurement limits of the ADC. Second image is Soren's DAC direct out (bypassing the balanced/buffer opamps).

https://www.dropbox.com/s/cnu86nonn1...a4700.jpg?dl=0

https://www.dropbox.com/s/5t12jyh7ob...4.4db.jpg?dl=0

Last edited by vanwykca; 28th January 2015 at 11:15 AM.
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Old 28th January 2015, 11:23 AM   #1099
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Balanced out is not as good and clips when the volume pot is out of circuit.

https://www.dropbox.com/s/c2anbbqh44...olume.jpg?dl=0

https://www.dropbox.com/s/5djyio4l6r...olume.jpg?dl=0

https://www.dropbox.com/s/iw7hyduukt...15vol.jpg?dl=0

https://www.dropbox.com/s/9chr8t830k...dbvol.jpg?dl=0
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Old 28th January 2015, 11:28 AM   #1100
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Thank you so much Soren, I have just received my 0.01% beauty right now and it is eager to become the beast ;-)

I am really looking forward to the manual for non-experts

cheers,
Pepe
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