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Old 6th September 2009, 11:26 PM   #1
vaughn is offline vaughn  United States
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Default Digital source selector?

I've searched and can't find any info...

I've got the DAC in this thread,

Experience with this DIY DAC ?

And I would like to be able to run both my Squeezebox and Oppo DVD(coaxial and optical outs, respectively) into and toggle between them. I don't use a preamp and would like to run the output of the DAC directly into my amplifier and use the digital switch for my source selection. I would like it if it is a stand alone board that I can incorporate into the same chassis with the DAC, but it isn't totally necessary.

Suggestions?
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Old 11th September 2009, 05:42 PM   #2
vaughn is offline vaughn  United States
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I'm not sure if I have stumped everyone with this question or perhaps the answer is so obvious that none have bothered to reply

When I search for a digital source switch all I come up with is a digital video switch which only switches optical connections. I found a pro sound switch that would work but at almost $600 I would much rather find a diy solution.
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Old 12th September 2009, 01:05 PM   #3
UKPD is offline UKPD  United Kingdom
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Default Digital Source Selector.

Take a look at MUX from Twisted Pear Audio.
That might fit your bill.


Regards Peter.
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Old 12th September 2009, 02:17 PM   #4
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Quote:
Originally Posted by vaughn View Post
I'm not sure if I have stumped everyone with this question or perhaps the answer is so obvious that none have bothered to reply

When I search for a digital source switch all I come up with is a digital video switch which only switches optical connections. I found a pro sound switch that would work but at almost $600 I would much rather find a diy solution.
With that board all you need is a SPDT switch to toggle between opt and coax. Just wire the switch to the jumper pins that change the input from coax to opt, one pole, two positions.If you need two coax inputs you can convert the opt in to coax in very easily.

Best, Bill
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Old 12th September 2009, 02:51 PM   #5
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If you take a look at the Impasse thread -- I show how to use the Silonex LDR's (Light dependent resistor) for switching inputs -- these are much lower distortion/noise than CMOS muxes -- and don't require a bipolar supply. You have to control the current into the diode with a resistor. In a switching application you don't have to worry about resistivity changes with temperature (it's not the resistance which changes as it is the output of the LED). I have used both Silonex and Vactrol's for this purpose.
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Old 1st October 2009, 09:49 AM   #6
zperko is offline zperko  Slovenia
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Quote:
Originally Posted by Bill Fuss View Post
With that board all you need is a SPDT switch to toggle between opt and coax. Just wire the switch to the jumper pins that change the input from coax to opt, one pole, two positions.If you need two coax inputs you can convert the opt in to coax in very easily.

Best, Bill
Bill you mentioned, that we can easily convert OPT input to COAX.
Can you explain the procedure.
I would like to use two COAX input and slect between them with SPDT switch.

Ziga
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Old 1st October 2009, 03:36 PM   #7
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Originally Posted by zperko View Post
Bill you mentioned, that we can easily convert OPT input to COAX.
Can you explain the procedure.
I would like to use two COAX input and slect between them with SPDT switch.

Ziga
Hi Ziga,
First, download the CS8416 data sheet and look at the typical connection page, it shows both coax and opt input arrangements. They are identical except the 5v supply to the torx and an additional 75ohm resistor to ground. Just remove the torx unit, add the resistor, and wire up a jack to the board, pretty easy. The two jumpers on the board control the internal 4 way mux, all you need is one spdt switch to go back and forth from opt(second coax) to coax. Just hook the center pin on the switch to the center jumper pin and the others to the other pins. You could switch all four mux inputs with a rotary switch also but the switching arrangment would be more complicated, and I haven't the need and have not worked through that.

Best, Bill
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Old 1st October 2009, 04:22 PM   #8
pilli is offline pilli  France
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Originally Posted by zperko View Post
(...) easily convert OPT input to COAX.
Have a look at this
http://sound.westhost.com/project85.htm

(in the Appendix)


Cheers,
pilli

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Old 1st October 2009, 06:22 PM   #9
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Have a look at this
http://sound.westhost.com/project85.htm

(in the Appendix)


Cheers,
pilli

_
That is not relevent, and the circuitry is already in place for switching.
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Old 1st October 2009, 09:14 PM   #10
pilli is offline pilli  France
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Quote:
Originally Posted by Bill Fuss View Post
That is not relevent, and the circuitry is already in place for switching.
I understand very well that the CS8416 already has support for one selectable input out of six. I was just answering the general question, in case someone wanted to know about optical (TTL) to coax (SPDIF) conversion, whatever receiver chip they may use.

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