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Old 2nd October 2009, 09:52 AM   #11
zperko is offline zperko  Slovenia
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Quote:
Originally Posted by Bill Fuss View Post
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
Thanks Bill. I will remove resistor and torx.

Ziga
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Old 6th October 2009, 12:14 AM   #12
vaughn is offline vaughn  United States
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I thought this thread had died and I just noticed my question had been answered!

Ziga, could you post a pic of your work if you do this mod?
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Old 6th October 2009, 12:52 AM   #13
vaughn is offline vaughn  United States
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Ok maybe I don't understand...

In my world a "torx" is a type of screw head, but for some reason I don't think that is what you are speaking of. I downloaded the sheet and looked at the typical connections page(pg 21) and I don't see anything that gives me a clue. Is a "torx" the jumper making the connection currently? Remove that and attach switch with 75ohm resistor going to which pin?

Bill, I don't suppose you have a picture of this modification(if you have done it)?
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Old 6th October 2009, 02:11 PM   #14
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Location: Central Florida
The Torx unit is the opt input device. The switching has nothing to do with the input circuitry, it just chooses which input pin is internally connected inside the cs8416. In hardware mode there are 4 input pins available, and they are all identical. On your board only 3 are used. One is set up for coax, one for opt, and one for usb. If you changed the input circuitry you could have all coax inputs, all opt inputs, all usb inputs, or any combination. The 2 jumpers on the board are a simple matrix that chooses the input pin in use, and has nothing to do with the input circuitry you choose to connect to the input pins, each is totally separate.
To hook up a simple spdt switch for opt/coax selection you simply connect the center switch pin to the center jumper pin and hook the outer switch pins to the outer jumper pins.
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Old 6th October 2009, 02:39 PM   #15
vaughn is offline vaughn  United States
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Thanks Bill!

That sounds suspiciously easy, I'm sure I'll manage to do something to screw it
up Actually, I do have one more question and I hope it isn't too annoying. There are six pins total; when you say connect to the center pin/outside pins do you mean the set nearest the edge of the board?
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Old 6th October 2009, 07:36 PM   #16
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No problem, Vaughn
Unless your board is different than everyone elses, there is only one jumper that has to be moved to switch between opt and coax.
Remove that jumper and you will have three pins on that side of the matrix, ignore the other side of the matrix.
Now hook the center terminal of your switch to the center pin and hook the other switch terminals to the other pins. Now you can switch between opt and coax with the flip of the switch.
If you want to use the usb input at some later date you will still have to move the other jumper, that is why I mentioned using a 2 pole rotary switch to enable switching between all 3 inputs.
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Old 6th October 2009, 09:11 PM   #17
vaughn is offline vaughn  United States
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Thanks for taking the time to respond, Bill, I appreciate it It looks like all I need to pick up today is a spdt switch and a fiber optic cable and I will be in business!
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Old 22nd August 2010, 05:30 AM   #18
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Quote:
Originally Posted by UKPD View Post
Take a look at MUX from Twisted Pear Audio.
That might fit your bill.


Regards Peter.
You can also look at Audio Authority 1177A autoselector
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