A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 23 - diyAudio
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Old 15th March 2013, 11:28 PM   #221
IanS1 is offline IanS1  United Kingdom
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Quote:
Originally Posted by Supersurfer View Post
My Alix/mpdpup is connected to the dddac with two boards.
I use the dddac power supplies 12v and 5v with minor modifications (black gate non polar antiparallel on output, film cap not soldered and elna silmic for the big caps.)
The alix is fed with a tent power supply.

Two extra boards with sowters are on their way to me (hopefully soon).

I also plan to mount tent shunt regulators on the dac boards, I wonder what that will do with the sound?

The sound is already pretty good and is a close match to my cd player/ dac combo but I hope this will improve with the planned modifications to exceed the cd player/dac performance ( I have a feeling that it will )
Do let us know how the modifications go. I for one am very interested in how far the DDDAC can be taken.
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Old 19th March 2013, 05:12 PM   #222
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I ordered a set of DDDACs and will build them in the next months and compared it to my BIII-Broskie Unbalancer setup...if anyone has done this comparison with a Sabre DAC, please let me know.
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Old 19th March 2013, 07:58 PM   #223
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Quote:
Originally Posted by Blitz View Post
I ordered a set of DDDACs and will build them in the next months and compared it to my BIII-Broskie Unbalancer setup...if anyone has done this comparison with a Sabre DAC, please let me know.
I am very curious in this comparison, please keep us updated.
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Old 21st March 2013, 02:46 PM   #224
tuyen is offline tuyen  Australia
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starting to put together the 5v and 12v power supply kits.
Click the image to open in full size.

power supply kits done. now time to wire it all back up and see if it brings any improvements!
Click the image to open in full size.

also i relised my preamp is fully balanced and has balanced input. so if I wanted to wire the dddac board to output balanced, do I need output capacitors?

Cheers!
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Old 21st March 2013, 02:54 PM   #225
dddac is offline dddac  Germany
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hi Tuyen, nice work so far !
yes you need capacitors if there is a connection between both systems ground. this is normally the case, one way or the other. if not you can try without, as long as the amp can handle a few mV DC. that is what you will measure, please check, between POS and NEG terminal....

oh, do not forget to place the jumper on the WaveIO board to "EXT"
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Happy listening and building
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Old 21st March 2013, 07:40 PM   #226
AudioH is offline AudioH  United Kingdom
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Quote:
Originally Posted by tuyen View Post
starting to put together the 5v and 12v power supply kits.


also i relised my preamp is fully balanced and has balanced input. so if I wanted to wire the dddac board to output balanced, do I need output capacitors?

Cheers!
Hi tuyen,
i have the dddac woking with balanced outputs, no capacitors, no problems at all.
Regards
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Old 22nd March 2013, 05:14 PM   #227
Tinco is offline Tinco  Netherlands
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Hi, I am ordering the parts for the power supply, for some reason farnell doesn't have 25VAtoroid transformers, only 30VA would these work too? They don't seem to have the handy square casing:

Toroid Transformers at Farnell

Okey nvm, I'm obviously rather bad at finding stuff at Farnell, it worked now and I got the right ones I think:

25VA transformers on Farnell

Last edited by Tinco; 22nd March 2013 at 05:37 PM. Reason: Found out what I did wrong
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Old 24th March 2013, 12:15 AM   #228
Tinco is offline Tinco  Netherlands
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Please don't take this question as a criticism, I am just curious about how these things work:

Would there be less need for big output capacitors or good transformers if the DAC were designed in a more complex way?

Or in other words: is this DAC intentionally expensive? Could similar results come from a design that required less expensive parts?

I really love this design for its simplicity, but the suggestions for ~150e worth of capacitors or ~600e worth of transformers struck me as odd, and leave me wondering about the reason.
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Old 24th March 2013, 06:11 AM   #229
bravi is online now bravi  New Zealand
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Location: Wellington, New Zealand
Default Testing the DDAC

Hi All,

First oF all must acknowledge what a geat guy Doede is to deal with!
Just got the dac going for an initial run on the bench top with the assembly on a mdf board to sort out/ trouble shoot if required. My raw supply is a bit over the top. Consists of two 30Va EI transformers with a secondary of 22v centre tapped. For the 5V supply, I set up a full wave supply feeding two 25mh (2 amp) chokes followed by 6800mfd which then feeds into Doede's psu boards. For the 12V supply its bridge across the full 22V feeding a 0.3H (1.1amp) choke feeding into 12000mfd and then into the PSU board for stabilsation. Diodes are MBR10100 single diodes to give me the flexibility.

Initial raw supply tests under resistor load gave a clean 7mv ripple before the board for the 12v supply and about 25mv for the 5V supply.
I used Duncan amps PSU modeler to ensure that current loading is well above the critical level. Used extra power resistors to do this.

Tested the sound with headphones ( AKG702, silver wire harness) and Schiit lyr headphone amp. Sounds great, but Foobar settings may need checking as there are random scratchy noises when playing. Will try to post photos over the next few days.

Cheers!

Ravi
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Old 24th March 2013, 11:04 AM   #230
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Having heard IanS1's DDDAC in single and now four DAC board configuration, I have to confirm it sounds sublime in his set up.

I have ordered and await kits from Doede, having sold my Wadia 581iSE CDP. Yep, it sounded that good!
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