Multiple input DAC kit

irbow · 11th May 2011, 03:39 PM

Hi,

I am interested in DAC kits with sample rates up to 192KHz. Most of these seem to have one optical, coax and USB input. Is anybody aware of any good quality kits (up to 250 Uk pounds or so is okay for the kit) that have at least 2 optical (toslink) or more inputs? If not is it possible to add these?

Any advice would be greatly appreciated.

Iain

Bill Fuss · 12th May 2011, 12:13 PM

If you are referring to the Chinese Dacs that use the CS8416 for the input, that chip actually has 4 inputs that can all be used with toslink receivers or coax or USB in any combination. You can have 4 toslink inputs if you wish just by rewiring the inputs and adding the toslink receivers. The input switching is also very simple. AFAIK, no one offers a kit already set up like that, this IS DIY after all.

I haven't seen a unit that is 192 toslink input capable, they use upsampling chips to reach 192 and they work very well.

If you would like to see the schematic of one of these Dacs you can email me and I'll send it to you.

Best, Bill

SoNic_real_one · 13th May 2011, 12:43 AM

Optical (toslink) won't go usually past 96kHz. Because of either transmitter, receiver or the plastic optical cable. Or all of them. And usually adds more jitter than the straight copper connection.

abraxalito · 13th May 2011, 12:47 AM

Quote:

Originally Posted by SoNic_real_one

And usually adds more jitter than the straight copper connection.

Has the big advantage though of zero common mode noise injected into your DAC.

SoNic_real_one · 13th May 2011, 02:09 AM

Common noise? Not so much a problem.
Filtering at the input, proper shielded cable, matching 75 ohm impedance, using the DAC in a household enviroment (not close to a GSM/CDMA repeator antenna), transition-trigger inputs...
Sure, who wants to be paranoic will go on AES/EBU path.

abraxalito · 13th May 2011, 02:15 AM

Well I find it to affect sound quality myself - AES/EBU is not the answer either.

Francec · 13th May 2011, 07:27 AM

AMB Gamma 1. I have the PCBs and am in the process of assembling. It has the inputs and is very small; credit card size.

Frank

Andersonix · 13th May 2011, 07:51 AM

Or Gamma2 from amb.org?

Francec · 13th May 2011, 08:47 AM

Quote:

Or Gamma2 from amb.org?

Gamma 1 and I'm sure it has SPDIF, USB and Toslink.

Frank

qusp · 13th May 2011, 12:29 PM

yes, but he wants multiple toslink, there is a whole swathe of dacs that allow coax, toslink and usb

11th May 2011, 03:39 PM	#1
irbow diyAudio Member Join Date: May 2007	Multiple input DAC kit Hi, I am interested in DAC kits with sample rates up to 192KHz. Most of these seem to have one optical, coax and USB input. Is anybody aware of any good quality kits (up to 250 Uk pounds or so is okay for the kit) that have at least 2 optical (toslink) or more inputs? If not is it possible to add these? Any advice would be greatly appreciated. Iain __________________ Iain.

13th May 2011, 02:15 AM	#6
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	Well I find it to affect sound quality myself - AES/EBU is not the answer either. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

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12th May 2011, 12:13 PM	#2
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	If you are referring to the Chinese Dacs that use the CS8416 for the input, that chip actually has 4 inputs that can all be used with toslink receivers or coax or USB in any combination. You can have 4 toslink inputs if you wish just by rewiring the inputs and adding the toslink receivers. The input switching is also very simple. AFAIK, no one offers a kit already set up like that, this IS DIY after all. I haven't seen a unit that is 192 toslink input capable, they use upsampling chips to reach 192 and they work very well. If you would like to see the schematic of one of these Dacs you can email me and I'll send it to you. Best, Bill

13th May 2011, 12:43 AM	#3
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	Optical (toslink) won't go usually past 96kHz. Because of either transmitter, receiver or the plastic optical cable. Or all of them. And usually adds more jitter than the straight copper connection.

13th May 2011, 02:09 AM	#5
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	Common noise? Not so much a problem. Filtering at the input, proper shielded cable, matching 75 ohm impedance, using the DAC in a household enviroment (not close to a GSM/CDMA repeator antenna), transition-trigger inputs... Sure, who wants to be paranoic will go on AES/EBU path.

13th May 2011, 07:27 AM	#7
Francec Banned Join Date: Jul 2006 Location: Port Melbourne, Australia	AMB Gamma 1. I have the PCBs and am in the process of assembling. It has the inputs and is very small; credit card size. Frank

13th May 2011, 07:51 AM	#8
Andersonix diyAudio Member Join Date: Jan 2004 Location: Silicon Valley	Or Gamma2 from amb.org?

13th May 2011, 12:29 PM	#10
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	yes, but he wants multiple toslink, there is a whole swathe of dacs that allow coax, toslink and usb

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