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Signalyst DSC1
Signalyst DSC1
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Old 28th September 2019, 02:37 PM   #1561
vitopro is offline vitopro  Italy
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Join Date: Apr 2011
Hi Pavel,


my dac is ready, works well but when in pause between tracks i can hear an hum.
What may be caused from?


Thanks
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Old 30th September 2019, 02:19 PM   #1562
potstip is offline potstip  Turkey
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Is there anybody know DSC v2 oupput impedance with and without transformer.?

And Can we replace transformer with passive volume attunator? Or it has other functions like filtering some noise?
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Old 30th September 2019, 02:31 PM   #1563
ppy is offline ppy  Russian Federation
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Quote:
Originally Posted by vitopro View Post
my dac is ready, works well but when in pause between tracks i can hear an hum.
What may be caused from?
So far, little information. What kind of noise you hear. If this is a low frequency interference, then there is most likely a grounding problem.

Last edited by ppy; 30th September 2019 at 02:34 PM.
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Old 30th September 2019, 02:31 PM   #1564
barrows is offline barrows
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Default output Z

Quote:
Originally Posted by potstip View Post
Is there anybody know DSC v2 oupput impedance with and without transformer.?

And Can we replace transformer with passive volume attunator? Or it has other functions like filtering some noise?
This has been posted already earlier in the thread somewhere. As I recall, Pavel's boards with transformers had an output impedance that was pretty high. At least a few hundred Ohms. Indeed if you do not use the transformer you would need to add additional filer elements as the transformer does act as the final filter stage for the DSD noise.
Given the already high output impedance the use of a passive volume control without any buffer/gain stage after it would be ill advised. These boards have low enough output voltage and high enough output impedance that I would suggest they are best used into an active preamp with some gain and a high input impedance.
For my build I needed more gain to drive my amplifier directly (especially considering that one needs to attenuate the signal by -3 to -6 dB before oversampling to DSD to avoid clipping). I ended up using a Muses volume control chip after the DSC-2, followed by an active gain stage (amb Alpha 24) so that I could drive an amplifier directly with analog volume control and low output impedance.

Last edited by barrows; 30th September 2019 at 02:35 PM.
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Old 6th October 2019, 05:24 PM   #1565
vitopro is offline vitopro  Italy
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Quote:
Originally Posted by ppy View Post
So far, little information. What kind of noise you hear. If this is a low frequency interference, then there is most likely a grounding problem.
Problem solved. Joined power ground to xlr ground. Thanks
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Old 6th October 2019, 05:28 PM   #1566
gionag is offline gionag  Italy
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Quote:
Originally Posted by vitopro View Post
Problem solved. Joined power ground to xlr ground. Thanks
sent a mail to pavel just about this very problem some days ago.
i have found later the same solution as yours and reported him back. no answers.
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Old 7th October 2019, 04:35 PM   #1567
potstip is offline potstip  Turkey
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for the output transformer 50mW (0.05W) power rating is enough?
I do not want to use that ugly big transformers!
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Old 7th October 2019, 08:53 PM   #1568
potstip is offline potstip  Turkey
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other question is transformer is for LP filter or i/v conversation or both?
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Old 8th October 2019, 12:29 PM   #1569
merlin el mago is offline merlin el mago  Europe
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Normally LPF
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Old 11th October 2019, 07:04 AM   #1570
audiodesignguide3 is offline audiodesignguide3
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Join Date: May 2019
Yesterday evening the first serious listening test about the new dsc module with CT7302 vs NAA (Network Audio Adapter) DSC module.

The quality of the last DSC with CT7302 is very high, the same details and the same sound stage of the NAA DSC module.

The NAA DSC module with HQplayer filters is a little bit more softer but it is not easy define if it is more or less near to the real sound.

Using the CT7302 with jRiver the sound is very natural and analog.

Soon I will test the prototype of the new CT7302 DSC module realized by Quang Hao.

The kit of Quang Hao will include a controller module with remote to select input, volume, swap channels and output dsd frequency.


Probably he will open a Group Buy.

Last edited by audiodesignguide3; 11th October 2019 at 07:09 AM.
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