Digital source selector?

[vaughn]

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?

[vaughn]

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.

[UKPD]

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


Regards Peter.

[Bill Fuss]

Originally Posted by vaughn

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

[jackinnj]

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.

[zperko]

Originally Posted by Bill Fuss

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

[Bill Fuss]

Originally Posted by zperko

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

[pilli]

Originally Posted by zperko

(...) easily convert OPT input to COAX.

Have a look at this
http://sound.westhost.com/project85.htm

(in the Appendix)


Cheers,
pilli

_

[Bill Fuss]

Originally Posted by pilli

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.

[pilli]

Originally Posted by Bill Fuss

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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