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-   -   Signalyst DSC1 (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1.html)

Goto 1st November 2017 09:14 AM

Mshow DSC1 DAC decoder DSD Assembled Compatible with Amanero and our XMOS usb | eBay

Unbalanced, close to MIska's original design but they changed the muting circuit and maybe other small details.

I cannot comment on the transformer question. There are plenty of ways to convert balanced signals to unbalanced - the Twisted Pear Balsie module is simple, effective and provides good output drive for instance, at the expense of more complication.

If you order the DSC Balanced kit let us know how you get on with it.

canvas 1st November 2017 12:29 PM

Quote:

Originally Posted by Goto (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post5225795.html#post5225795)
BUT suffers a certain background noise that is audible in quiet patches.

Perhaps noise are coming from the logic gate. I might try to put a ferrite bead after each resistor. There are various beads from Murata. I think it worth a try.

Frank513 4th November 2017 04:01 PM

Quote:

Originally Posted by canvas (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post5230591.html#post5230591)
Perhaps noise are coming from the logic gate. I might try to put a ferrite bead after each resistor. There are various beads from Murata. I think it worth a try.

Interesting remark!
I will follow closely the idea.

ppy 4th November 2017 04:08 PM

1 Attachment(s)
Quote:

Originally Posted by canvas (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post5230591.html#post5230591)
Perhaps noise are coming from the logic gate. I might try to put a ferrite bead after each resistor. There are various beads from Murata. I think it worth a try.

I already did this with a сhinese non-balanced board. The problem of noise has remained.

Frank513 16th November 2017 09:38 PM

Some informations interesting to think about some ways to improve electronics from murata site.
https://www.murata.com/~/media/webre...en&h=262&w=640

Wire could be considered like a noise source of spatial conduction.
Transformer is also considered like a similar case.

Some feature about sowter transformer :
Mumetal core for minimal harmonic distortion. Internal electrostatic shield for high common mode noise rejection. Mumetal can for magnetic shielding.

i think mumetal shield is an other step to upgrade transformer.

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Embehu 20th November 2017 02:11 AM

I have to buy an unbalanced version of DSC1-DAC because the seller was ran out of balanced board, very sad
What I did here is I soldered all components but not IV stage, and take the signal out before IV stage for measurement.

I measured output without playing dsd file; that noise is coming from computer via usb power supply through Amanero board.

https://i.imgur.com/mtRPs5x.jpg


I don't think I will finish iv stage of dsc1 dac because it's confirmed that there are noises while playing dsd file. So do you know any iv converter that is good enough for this dac (the signal very small 0,2mVpp with impedance change from 470 ohm to 15K ohm)? Or can I use transformer for isolating high frequency noises, if yes, what is the ratio of that transformer 1:1, 1:5 or other?
Thank you for your patience in reading my issues!

Frank513 20th November 2017 11:08 AM

There is a standard i/v converter ad844. That 's work well for it.
Take a look Squarewaves from DACs - Miska's Blog - Computer Audiophile
Sowter 3575 in 1:1 is adapted to DSC1 for example.

nautibuoy 20th November 2017 11:24 AM

Quote:

Originally Posted by Embehu (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post5249834.html#post5249834)
I measured output without playing dsd file; that noise is coming from computer via usb power supply through Amanero board.

Power the Amanero with a better power supply and use it with an isolator;

Free Amanero Isolator bare PCB Twin pack - DIYINHK

or even better use an isolator/reclocker like the TP Hermes/Cronus.

Alternatively, there are USB boards that include isolation and reclocking, such as the JLSounds I2SoverUSB product.

canvas 20th November 2017 11:22 PM

Quote:

Originally Posted by ppy (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post5233864.html#post5233864)
I already did this with a сhinese non-balanced board. The problem of noise has remained.

It looks like the beads are on the VCC side. I'd place them after Q0~Q7 for each ACHT595.

Cagomat 21st November 2017 05:20 AM

Hi

found this on a japanese site. They use flip flops and different resistor values

DSD原理基板


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