S/PDIF to toslink

agithegreat · 31st July 2010, 04:57 PM

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.

Bill Fuss · 31st July 2010, 06:32 PM

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.

agithegreat · 09:57 PM

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?

agithegreat · 31st July 2010, 10:47 PM

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

Bill Fuss · 31st July 2010, 11:27 PM

Yeah, I wrote torx and I meant totx which is the transmitter.

agithegreat · 31st July 2010, 11:59 PM

Aha, got it now.
That could be even easier for me then, so long as the vcc is clean (computer powersupply

).

Thanks

wwenze · 1st August 2010, 04:44 AM

Not sure if any tom-dick-harry LED can handle that high a frequency, but TOSLINK transmitters are cheap.

Example

31st July 2010, 04:57 PM	#1
agithegreat diyAudio Member Join Date: Jun 2008	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.

31st July 2010, 09:53 PM	#3
agithegreat diyAudio Member Join Date: Jun 2008	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? Last edited by agithegreat; 31st July 2010 at 09:57 PM.

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31st July 2010, 06:32 PM	#2
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	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.

31st July 2010, 10:47 PM	#4
agithegreat diyAudio Member Join Date: Jun 2008	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

31st July 2010, 11:27 PM	#5
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	Yeah, I wrote torx and I meant totx which is the transmitter.

31st July 2010, 11:59 PM	#6
agithegreat diyAudio Member Join Date: Jun 2008	Aha, got it now. That could be even easier for me then, so long as the vcc is clean (computer powersupply ). Thanks

1st August 2010, 04:44 AM	#7
wwenze diyAudio Member Join Date: Mar 2008	Not sure if any tom-dick-harry LED can handle that high a frequency, but TOSLINK transmitters are cheap. Example

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