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Old 31st July 2010, 04:57 PM   #1
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Default S/PDIF to toslink

It may seem a little strange question to ask, but is it as easy as a resistor and an LED?

I'm wanting to get toslink output available on my car pc, but it currently only has s/pdif. I've seen a few sites saying just a red led and a 100-120ohm r is fine.
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Old 31st July 2010, 06:32 PM   #2
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If you google torx all your questions should be answered. Toslink transmitters require the SPDIF signal at TTL or CMOS voltage level. Standard SPDIF output level is only 0.5V. I've never tried the red led trick, go for it.
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Old 31st July 2010, 09:53 PM   #3
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Thats great. The question is now, how do i raise 'standard' spdif to TTL level?

Torx has shown answers for the opposite conversion (optical to spdif) but none so far for the other way.

Would something like this be suitable?
Click the image to open in full size.

Last edited by agithegreat; 31st July 2010 at 09:57 PM.
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Old 31st July 2010, 10:47 PM   #4
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After some more searching and fiddling i found that the source was converted from ttl to spdif.

So I will just tap off prior to this source and attach a red LED and resistor and try it.

I'll post up my findings
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Old 31st July 2010, 11:27 PM   #5
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Yeah, I wrote torx and I meant totx which is the transmitter.
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Old 31st July 2010, 11:59 PM   #6
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Aha, got it now.
That could be even easier for me then, so long as the vcc is clean (computer powersupply ).

Thanks
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Old 1st August 2010, 04:44 AM   #7
wwenze is offline wwenze  Singapore
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Not sure if any tom-dick-harry LED can handle that high a frequency, but TOSLINK transmitters are cheap.

Example
Click the image to open in full size.
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