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Old 25th March 2013, 12:44 PM   #241
dddac is offline dddac  Germany
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what current are you referring to ?
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Old 25th March 2013, 12:46 PM   #242
dddac is offline dddac  Germany
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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
this is very cool
I thought about it, but decided I had no time

could you please post circuit and partnumbers?
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Old 25th March 2013, 12:52 PM   #243
dddac is offline dddac  Germany
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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.
indeed, the transformers are an option. I wanted the benefit of all dac outputs, balanced signal and the extra gain. guess what? the transformers were superior in SQ as well . so it was a double whammy

without top components, the dac is already great and also with the mundorfs supplied in the kit, it plays at very high level.

as long as people are willing to spend thousands of euro for interconnects, I thing spending money on TOP components is not a waste. but it is not a MUST. the basic version with the standard components is guaranteed already for huge listening joy . the rest is tweaking and hobby and if you have the budget, totally worth it
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Old 25th March 2013, 12:58 PM   #244
AudioH is offline AudioH  United Kingdom
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this is very cool
I thought about it, but decided I had no time

could you please post circuit and partnumbers?
Thank You DDDAC. It was fun developing, lots of potential to play!

The circuit is all in my head at the moment so will publish once documented.

Regards
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Old 25th March 2013, 12:58 PM   #245
xslavic is offline xslavic  Moldova
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5v power to digital and to *analog part
should i limit the current or it works only by using the 10k reference resistors ?
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Old 25th March 2013, 01:01 PM   #246
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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"
....which would mean for tube amps to have no issue, right ? A few mV dc does not matter, a few volt would...
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Old 25th March 2013, 01:21 PM   #247
dddac is offline dddac  Germany
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5v power to digital and to *analog part
should i limit the current or it works only by using the 10k reference resistors ?
there is no need for any current limiting... the 10 k you refer to is probably the one for the bias according to standard datasheet design and in my case that is 6k.

still not 100% sure, what you exactly try to achieve
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Old 25th March 2013, 03:27 PM   #248
dddac is offline dddac  Germany
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....which would mean for tube amps to have no issue, right ? A few mV dc does not matter, a few volt would...
spot on ! and most tube amps have some sort of DC blocking further on in the signal path, so no worries of DC appearing at the speakers .....
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Old 26th March 2013, 10:18 AM   #249
Almeg69 is offline Almeg69  United Kingdom
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I have been busy soldering these few days. I am very impressed with the quality of the parts and PCB`s.
A lot of time and effort has been expended in the design and application.
Testing power supplies over the weekend. ;-)
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Old 26th March 2013, 02:38 PM   #250
tuyen is offline tuyen  Australia
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Click the image to open in full size.

sounding pretty sweet. initial improvements that I think I can hear is that the music has a more open, refined feel and subtleties of notes are coming out.
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