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Old 22nd February 2015, 11:57 AM   #1
pass90 is offline pass90  Italy
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Default toslink switch

Hi everybody, i'm new to the forum. I'm searching a simple and chip way to built a toslink switch with 2 or 3 input leading to 1 output. The main feature is that it has to be completely automatic (signal sensing), in order to switch automatically on the active connector.

I see different project here but they all need a remote or slide selector. Any idea?

Thanks!
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Old 22nd February 2015, 12:43 PM   #2
Mooly is offline Mooly  United Kingdom
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Might be worth a try,
Optical splitter... used as a combiner :)

If it didn't work the way you wanted then switching off one source would allow the other through.

To do it via signal sensing of the optical signal would be very complex
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Old 22nd February 2015, 01:05 PM   #3
pass90 is offline pass90  Italy
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Quote:
Originally Posted by Mooly View Post
Might be worth a try,
Optical splitter... used as a combiner :)

If it didn't work the way you wanted then switching off one source would allow the other through.

To do it via signal sensing of the optical signal would be very complex
I used this trick a month ago and for an unknown reason damaged torx193, maybe it was casual but made me think...
A friend noticed me the Audio Authority 1177 that is exactly what i'm searchig for, but it costs a lot plus shipping and import duties for Italy.
I'd like a diy solution also because need 3 switchers for 3 different audio systems.
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Old 22nd February 2015, 01:15 PM   #4
Mooly is offline Mooly  United Kingdom
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I can't think of any easy diy solution tbh. To detect the presence of signal data on the optical feeds requires some dedicated means of intercepting and sampling them and then some rules to follow as to what to do if say two or more inputs were active.

Not easy at all from a diy perspective.
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Old 23rd February 2015, 09:04 AM   #5
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maybe you could do something based on sensing the supply current of the toslink devices
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Old 23rd February 2015, 09:10 AM   #6
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measure the supply current with and without signal. (don't forget to load the digital output with 10pf, equivalent of pcb track in gate input)
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Old 23rd February 2015, 09:42 AM   #7
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by basreflex View Post
maybe you could do something based on sensing the supply current of the toslink devices
Interesting idea. Some TOSLINK outputs are always active (lit), even when the device is in standby. You would have to try it all and see.
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Old 24th February 2015, 07:49 PM   #8
pass90 is offline pass90  Italy
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Good idea, i have available a totx193 for measurement.
Today a friend give me an idea: connecting 2 or 3 receivers directly to a transmitter and insert 3 small diod (1N4148) between receivers and transmitter, by this way when a receiver in ON the signal goes only to the transmitter and can't go back to others receivers. The only problem can be a simultaneous signal on the receivers.
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Old 24th February 2015, 07:55 PM   #9
Mooly is offline Mooly  United Kingdom
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You would have to draw it.

You say ' insert 3 small diod (1N4148) between receivers and transmitter'.

Its an optical cable between the receiver and transmitter... so I'm probably not understanding what you mean... draw it
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Old 25th February 2015, 10:16 AM   #10
DF96 is offline DF96  England
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I think he means in the electrical path between receivers and the single transmitter in his combiner box.
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