A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 24 - diyAudio
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Old 24th March 2013, 01:40 PM   #231
tuyen is offline tuyen  Australia
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what improvements (subjective I know) can you comment going from 1 to 4 boards? Trying to decide if I should start saving..
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Old 24th March 2013, 03:15 PM   #232
grael is offline grael  France
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Quote:
Originally Posted by Tinco View Post
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.
Hello.

The suggested capacitors are really "highest available quality".
You can probably achieve excellent performances with less expensive ones.
An interesting reading, subjective opinion of course, but it gives a good idea of relative audio quality between capacitors:
Humble Homemade Hifi

On the "budget side", Jantzen audio (Silver or Superior Zcap) should give very good results for around 30/35 euros a pair.

Last edited by grael; 24th March 2013 at 03:40 PM.
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Old 24th March 2013, 03:40 PM   #233
Tinco is offline Tinco  Netherlands
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Thanks a lot, that makes the entire set be in a reasonable price range.

I am still a bit unclear about when a transformer is needed, it reads like it is optional but recommended. Does it depend on the (pre-)amplifier that comes after the DAC? What should I look for when matching the DAC to an amplifier?
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Old 24th March 2013, 03:59 PM   #234
IanS1 is offline IanS1  United Kingdom
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Quote:
Originally Posted by Tinco View Post
Thanks a lot, that makes the entire set be in a reasonable price range.

I am still a bit unclear about when a transformer is needed, it reads like it is optional but recommended. Does it depend on the (pre-)amplifier that comes after the DAC? What should I look for when matching the DAC to an amplifier?

Doede will explain in more detail I'm sure but the transformers aren't needed at all. If you do want to try the transformers though you will need at least 4 DAC boards.

I currently have 4 DAC boards with the Mundorf Caps, I'm considering the transformers as the next step. As it is in my system the DDDAC sounds excellent.
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Old 24th March 2013, 04:02 PM   #235
IanS1 is offline IanS1  United Kingdom
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Originally Posted by tuyen View Post
what improvements (subjective I know) can you comment going from 1 to 4 boards? Trying to decide if I should start saving..
In one word, 'refinement' I think fits quite well.
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Old 24th March 2013, 04:13 PM   #236
grael is offline grael  France
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Originally Posted by IanS1 View Post
Doede will explain in more detail I'm sure but the transformers aren't needed at all. If you do want to try the transformers though you will need at least 4 DAC boards.
If I'm not mistaken, the original purpose of the tranformers was to boost the output signal from 1.25V to 5V.

Depending on your (pre)amp, 1.25 may be far enough but some setups could benefit from higher input level.
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Old 24th March 2013, 05:32 PM   #237
AudioH is offline AudioH  United Kingdom
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Default LCD Status Panel

Hi All,

I've mocked up an Arduino equivalent, Tennsy 1++, to the WaveIO to show the current status of Host, Streaming and sample rate rather than LEDS.

Here's a few pics.

Regards
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Old 24th March 2013, 07:32 PM   #238
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Quote:
Originally Posted by IanS1 View Post
In one word, 'refinement' I think fits quite well.
Yep that about sums it up Ian. The single board had scale and an analogue presentation. The extra boards added a little more depth, and a good deal more subtlety to the texture
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Old 24th March 2013, 10:58 PM   #239
tuyen is offline tuyen  Australia
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Cheers guys. Guess I should start saving then.

Has anyone tried say, 8 boards paralleled?

I know the mundorf s/g/o caps are good, but has anyone tried Duelund vsf or cast caps with the dddac1794? Or removed the caps as some amps already have dc blocking input caps already?
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Old 25th March 2013, 11:59 AM   #240
xslavic is offline xslavic  Moldova
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i have one question
is it necessary to limit current using a resistor to the PCM1794 ,should i use datasheet or less ?
thanks
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