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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
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Old 29th June 2016, 05:33 AM   #5471
dddac is offline dddac  Germany
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Quote:
Originally Posted by hyped View Post
Has anyone implemented a preamp/volume control in their build with the DDDAc would love to hear what you used, any details and how you found results


Sent from my 486 IBM WIN 3.1x Desktop...
I am still using the (special dddac) Sowter Transformers with taps at the output. So being a TVC
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Old 29th June 2016, 06:47 AM   #5472
hyped is offline hyped  Australia
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Originally Posted by dddac View Post
I am still using the (special dddac) Sowter Transformers with taps at the output. So being a TVC


Thanks DDD Interesting, admittedly somewhat new to DIY so not entirely sure how yours works (forgive me newbieness ) eagerly awaiting my DDDAC to arrive for my first build hoping to get some feedback/advice on volume control..



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Old 30th June 2016, 05:33 AM   #5473
dddac is offline dddac  Germany
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Originally Posted by hyped View Post
Thanks DDD Interesting, admittedly somewhat new to DIY so not entirely sure how yours works (forgive me newbieness ) eagerly awaiting my DDDAC to arrive for my first build hoping to get some feedback/advice on volume control..



Sent from my 486 IBM WIN 3.1x Desktop...
Check the pdf, I think it tells it all.

Every tap stands for a number of windings (my spec) which than delivers a different ratio for the input/output voltage. It is designed so, it is a ladder with certain dB steps which make sense as a volume control.

Normal pots or rotary switch volume Controls have the significant disadvantage that in the middle volumes the output impedance is relatively high which is not good driving cables (RC filter)

With a transformer this is of course NOT the case. In fact at every step of lower volume the performance of the Transforming ratio increases thanks to less windings. Output impedance gets also lower with every step. VERY good for driving cables.

But maybe it gets to technical again, sorry…
Attached Images
File Type: jpg Sowter TVC connections dB steps.JPG (46.6 KB, 395 views)
File Type: jpg Sowter TVC connections.JPG (31.2 KB, 386 views)
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Old 30th June 2016, 05:37 AM   #5474
hyped is offline hyped  Australia
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Quote:
Originally Posted by dddac View Post
Check the pdf, I think it tells it all.



Every tap stands for a number of windings (my spec) which than delivers a different ratio for the input/output voltage. It is designed so, it is a ladder with certain dB steps which make sense as a volume control.



Normal pots or rotary switch volume Controls have the significant disadvantage that in the middle volumes the output impedance is relatively high which is not good driving cables (RC filter)



With a transformer this is of course NOT the case. In fact at every step of lower volume the performance of the Transforming ratio increases thanks to less windings. Output impedance gets also lower with every step. VERY good for driving cables.



But maybe it gets to technical again, sorry…


Thanks DDD appreciate you taking time to reply. Might drop a line to Marco and can discuss the options prior to him shipping mine I did buy the output cap upgrade and dedicated power for board and USB board as well. I can't wait to get mine!


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Old 30th June 2016, 09:42 AM   #5475
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by hyped View Post
Has anyone implemented a preamp/volume control in their build with the DDDAc would love to hear what you used, any details and how you found results
I am in the process of building a TVC control with 27 relay switches that are controlled by an Arduino microcrontroller. It's intended to work my Sowter 9335 transformer, but other transformers will also work. Doede already tested the 9335 on his AP analyzer with the DDDAC, and it performed very well.

I built the first prototype on a perf board (which was a major PITA), and that seems to work well. In the end, the whole thing is intended to live on two PCB "decks" that are stacked on each other, and are plugged onto the Arduino. The overall concept is very similar to Doedes design, but without source selection (and I believe it will be physically smaller).

I am currently waiting to receive the first PCB boards for the firsd "deck" that will deal with relay switches 1-14. Once I get this working, I will finish the second board. In the end I will probably have some extra boards because OshPark wants me to order at least three boards.
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Old 30th June 2016, 02:16 PM   #5476
kartick is offline kartick
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Hello All - I had a very interesting email correspondence with Doede this morning. I put forward a question to him and he was gracious enough to take it sportingly and even encouraged that I can put it across to all of you here on the forum.

I am using the DDDAC from last 4 years. But I have been very interested to find out from others that how do they find the DDDAC vs some of the other coveted commercial DACs available such as the ones from Chord or Schiit Yggdrasil? Is there anyone who has used other high end dacs, share their impressions here?
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Old 30th June 2016, 08:22 PM   #5477
mbrennwa is offline mbrennwa  Switzerland
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Originally Posted by kartick View Post
Is there anyone who has used other high end dacs, share their impressions here?
See here.
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Old 1st July 2016, 03:30 AM   #5478
Chanh is offline Chanh  Australia
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Originally Posted by kartick View Post
I am using the DDDAC from last 4 years. But I have been very interested to find out from others that how do they find the DDDAC vs some of the other coveted commercial DACs available such as the ones from Chord or Schiit Yggdrasil? Is there anyone who has used other high end dacs, share their impressions here?

I was a big fan of DDDAC! Spent exceedingly more than $8,000, without considering the invested effort/time, for my build to date. Have also tried many others' commercialised DAC and found DDDAC is the most natural DAC there is, until I found Accuphase DC-37.
DC-37 does DSD remarkable well and simply has better noise ratio compare to my DDDAC build.

Please note this is a personal opinion, might not be applicable to all. Nonetheless, get out there and auditions many as possible instead of inhale the soldering fumes..!




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Old 1st July 2016, 08:45 AM   #5479
boldname is offline boldname
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Originally Posted by Chanh View Post
I was a big fan of DDDAC! Spent exceedingly more than $8,000, without considering the invested effort/time, for my build to date. Have also tried many others' commercialised DAC and found DDDAC is the most natural DAC there is, until I found Accuphase DC-37.
DC-37 does DSD remarkable well and simply has better noise ratio compare to my DDDAC build.

Please note this is a personal opinion, might not be applicable to all. Nonetheless, get out there and auditions many as possible instead of inhale the soldering fumes..!




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Surely it all depends on the DAC chip. For any DIYer the rest is do-able. So naturally what chip does the Accuphase DC-37 use

The rest is merely the same requirement to support this chip with the best LCR, and using ultra low noise regulated power supplies in all the key areas.
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Old 1st July 2016, 09:35 AM   #5480
Chanh is offline Chanh  Australia
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Default A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)

Quote:
Originally Posted by boldname View Post
Surely it all depends on the DAC chip. For any DIYer the rest is do-able. So naturally what chip does the Accuphase DC-37 use

The rest is merely the same requirement to support this chip with the best LCR, and using ultra low noise regulated power supplies in all the key areas.

Not disagree whatsoever. For the clarity I did extensively compare both DACs on my identical setup as I am owing them both. Mind you I have invested in DDDAC with love and funding were never an obstacle. Deep down I wanted DDDAC to be the better, but among all DACs I have experienced in my audio room first hand, this Accuphase DC-37 was better. We also did a shoot out between Accuphase DC-37 vs Gryphon Kalliope, recently too.

Here is the infor for Accuphase DC-37:
http://www.stereo.net.au/forums/inde...side-of-japan/

Here is the shoot out we did between DC-37 vs Kalliope:
http://www.stereo.net.au/forums/inde...0&share_type=t

Apologies for the off-topic.
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