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Signalyst DSC1
Signalyst DSC1
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Old 1st November 2017, 10:14 AM   #521
Goto is offline Goto  United Kingdom
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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.
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Old 1st November 2017, 01:29 PM   #522
canvas is offline canvas  Taiwan
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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.
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Old 4th November 2017, 05:01 PM   #523
Frank513 is offline Frank513  France
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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.
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Old 4th November 2017, 05:08 PM   #524
ppy is offline ppy  Russian Federation
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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.
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Last edited by ppy; 4th November 2017 at 05:15 PM.
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Old 16th November 2017, 10:38 PM   #525
Frank513 is offline Frank513  France
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Some informations interesting to think about some ways to improve electronics from murata site.
Click the image to open in full size.

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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Old 20th November 2017, 03:11 AM   #526
Embehu is offline Embehu  Viet Nam
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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.

Click the image to open in full size.


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!
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Old 20th November 2017, 12:08 PM   #527
Frank513 is offline Frank513  France
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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.
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Old 20th November 2017, 12:24 PM   #528
nautibuoy is offline nautibuoy  United Kingdom
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Quote:
Originally Posted by Embehu View Post
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.
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Old 21st November 2017, 12:22 AM   #529
canvas is offline canvas  Taiwan
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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.
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Old 21st November 2017, 06:20 AM   #530
Cagomat is offline Cagomat  Germany
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Hi

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

DSD原理基板
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