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Old 11th May 2011, 03:39 PM   #1
irbow is offline irbow  United Kingdom
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Default 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
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Old 12th May 2011, 12:13 PM   #2
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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
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Old 13th May 2011, 12:43 AM   #3
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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.
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Old 13th May 2011, 12:47 AM   #4
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Quote:
Originally Posted by SoNic_real_one View Post
And usually adds more jitter than the straight copper connection.
Has the big advantage though of zero common mode noise injected into your DAC.
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Old 13th May 2011, 02:09 AM   #5
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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.
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Old 13th May 2011, 02:15 AM   #6
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Well I find it to affect sound quality myself - AES/EBU is not the answer either.
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Old 13th May 2011, 07:27 AM   #7
Francec is offline Francec  Australia
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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
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Old 13th May 2011, 07:51 AM   #8
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Or Gamma2 from amb.org?
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Old 13th May 2011, 08:47 AM   #9
Francec is offline Francec  Australia
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Quote:
Or Gamma2 from amb.org?
Gamma 1 and I'm sure it has SPDIF, USB and Toslink.

Frank
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Old 13th May 2011, 12:29 PM   #10
qusp is offline qusp  Australia
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yes, but he wants multiple toslink, there is a whole swathe of dacs that allow coax, toslink and usb
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