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Old 28th October 2011, 11:29 PM   #1
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Default diy Optical SPDIF Switch?

input: 4 x optical SPDIF
output: 1 x optical SPDIF

What should I buy? Or should I just buy that one for $60 of amazon--premade?

I'd like to integrate it into a DIY preamp though--so leaning towards diy.

Thanks.
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Old 29th October 2011, 08:06 AM   #2
UV101 is offline UV101  England
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Why do you need optical out?

It would be difficult to switch light. I'd imagine the commercial ones convert to spdif to switch and back to tos to output. The actual tos receiver (connector) will output spdif on 2 of it pins. You could use relays to select which input you require.
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Old 29th October 2011, 11:22 PM   #3
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I need optical out because i have it feed into a dac that has an optical input. Well it also has a coaxial input (you can toggle switch it).
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Old 30th October 2011, 12:24 AM   #4
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4051 style cmos switch or TTL version of 8in 1out mux chip.

its what I use for my spdif switch

either one works; I tried the analog switch and the ttl switch and both work fine for spdif speeds.

make sure you get 5v toslink blocks and not 3v ones! they make 2 kinds so be sure.

(my spdif switch is controlled by i2c and remoted from another preamp. if you are not in a hurry, you can wait for a board run for my project).
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Old 30th October 2011, 08:54 AM   #5
jitter is offline jitter  Netherlands
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Quote:
Originally Posted by audiogeekess View Post
input: 4 x optical SPDIF
output: 1 x optical SPDIF

What should I buy? Or should I just buy that one for $60 of amazon--premade?

I'd like to integrate it into a DIY preamp though--so leaning towards diy.

Thanks.
DIY? Well then, here's the thread when I built mine: DIY DAC with input switchingon a budget?. Somewhere in it, you'll find a link to a website with the design that was the inspiration for my own concoction, skip to post #37 of that thread. I use it every day and it works fine.

I made one with two coax in, two optical in, one optical and one coaxial out.
Should be easy to modify to your needs, though...

Last edited by jitter; 30th October 2011 at 09:11 AM.
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Old 30th October 2011, 09:58 AM   #6
UV101 is offline UV101  England
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I'd be interested in a comparison between a digitally switched version and a mechanically switched one. I tend to lean towards the latter option eliminating on chip crosstalk. I accept that using mechanical switches has it's own issues, but I like the idea of the complete isolation.
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Old 30th October 2011, 01:32 PM   #7
jitter is offline jitter  Netherlands
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Wouldn't there also be crosstalk in a switch?
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Old 30th October 2011, 01:58 PM   #8
UV101 is offline UV101  England
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Quote:
Originally Posted by jitter View Post
Wouldn't there also be crosstalk in a switch?
I don't think running independent relays to switch 4 inputs to a single output would suffer from crosstalk. Each input would be completely mechanically isolated from each other. As stated there are other considerations such as contact resistance, size and more complex switching to control the relays. I'd still chose this option over a single chip acting as a switch with all signals present on die at all times.
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Old 30th October 2011, 02:30 PM   #9
Mooly is online now Mooly  United Kingdom
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Optical SPDIF doesn't always behave as you might think,
Optical splitter... used as a combiner :)

3 way switches,
Optical splitter... used as a combiner :)

PRO SIGNAL|PSG00950|3-WAY OPTICAL SELECTOR SWITCH | CPC Products&MER=e-bb45-00001001
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Old 30th October 2011, 06:36 PM   #10
UV101 is offline UV101  England
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Quote:
Originally Posted by Mooly View Post
Optical SPDIF doesn't always behave as you might think,
Optical splitter... used as a combiner :)

3 way switches,
Optical splitter... used as a combiner :)

PRO SIGNAL|PSG00950|3-WAY OPTICAL SELECTOR SWITCH | CPC Products&MER=e-bb45-00001001
I'm guessing those are using a prism to reflect the light much the same way that a projector will combine the separate Red, Green and Blue displays into a single image. Not convinced a cheap plastic prism is the best way to go

What about something like this?

DIY input selector

You only need to use 1 of the channels for the SPDIF. Any TOS receiver on the input will work.
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Last edited by UV101; 30th October 2011 at 06:39 PM.
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