Add Coax Out to M-Audio Transit?

TerryC · 20th July 2005, 10:21 PM

I'm looking for as much detail as possible describing how to add a coax out (or replace Toslink) to an M-Audio Transit. I would also be interested in any other succesful modifications ala Emperical Audio's mods.

georgehifi · 21st July 2005, 01:14 AM

If you instal a Tent Labs XO3 clock, not only will you get a vast improvement in sound quality, it also has a very good digital coax output built into the board, so you'll get the best of both worlds.

Cheers George

georgehifi · 21st July 2005, 09:13 AM

Forget what I said, I thought you misspelt transport, I just saw what a M-Audio Transit is, and it will never fit.

Cheers George

JohanH · 31st December 2005, 06:46 AM

Hello Terry,

I'm looking for the same info.
Did you find anything?

Thanks,
Johan

paologatto · 31st December 2005, 10:19 AM

Here http://www.epanorama.net/documents/audio/spdif.html there are some conversion schematics.

Jocko Homo · 31st December 2005, 04:21 PM

Those will work, but they all suffer from the same mistakes. There are better examples on this forum.

Jocko

JohanH · 1st January 2006, 07:03 AM

Hello Jocko,

Do you mean a circuit like this from the NEC 602 thread?

http://www.diyaudio.com/forums/showt...489#post594489

The other information I would need is to know where I can tap the TTL signal from the M-Audio Transit.

Thanks,
Johan

Nisbeth · 1st January 2006, 03:14 PM

Quote:

Originally posted by JohanH

The other information I would need is to know where I can tap the TTL signal from the M-Audio Transit.

On the input-pin of the optical transmitter

/U.

Jocko Homo · 1st January 2006, 03:20 PM

I never tried using any RS-422 TX parts. Seems odd to have an inverted output available, and not use it.........

Anyway, the drawback to using both the inverted and non-inverted ooutputs is that there may well be some prop delay in one of them. Unless they are perfectly aligned, don't use them. I have yet to see a F-F where they are, but I see people trying to use both together all the time.

I notice that the output Z of the 2 outputs is not identical, so that may be a clue.

Jocko

adev · 1st January 2006, 09:03 PM

I used a simple resistor divider on the input signal of the optical output which works like a charm (don't remember the exact values anymore but i think 300&75 ohms or so will be ok).

Actually, I removed the useless analog output part of the transit to route the 'coaxial' spdif through the 3.5mm jack

20th July 2005, 10:21 PM	#1
TerryC diyAudio Member Join Date: Jun 2005 Location: WA-USA	Add Coax Out to M-Audio Transit? I'm looking for as much detail as possible describing how to add a coax out (or replace Toslink) to an M-Audio Transit. I would also be interested in any other succesful modifications ala Emperical Audio's mods.

21st July 2005, 01:14 AM	#2
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	If you instal a Tent Labs XO3 clock, not only will you get a vast improvement in sound quality, it also has a very good digital coax output built into the board, so you'll get the best of both worlds. Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

21st July 2005, 09:13 AM	#3
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	Forget what I said, I thought you misspelt transport, I just saw what a M-Audio Transit is, and it will never fit. Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

1st January 2006, 07:03 AM	#7
JohanH diyAudio Member Join Date: Dec 2003 Location: Noord Brabant	Like this? Hello Jocko, Do you mean a circuit like this from the NEC 602 thread? http://www.diyaudio.com/forums/showt...489#post594489 The other information I would need is to know where I can tap the TTL signal from the M-Audio Transit. Thanks, Johan

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31st December 2005, 06:46 AM	#4
JohanH diyAudio Member Join Date: Dec 2003 Location: Noord Brabant	Hello Terry, I'm looking for the same info. Did you find anything? Thanks, Johan

31st December 2005, 10:19 AM	#5
paologatto diyAudio Member Join Date: Jun 2004 Location: Italy	Here http://www.epanorama.net/documents/audio/spdif.html there are some conversion schematics.

31st December 2005, 04:21 PM	#6
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Those will work, but they all suffer from the same mistakes. There are better examples on this forum. Jocko

1st January 2006, 03:20 PM	#9
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	I never tried using any RS-422 TX parts. Seems odd to have an inverted output available, and not use it......... Anyway, the drawback to using both the inverted and non-inverted ooutputs is that there may well be some prop delay in one of them. Unless they are perfectly aligned, don't use them. I have yet to see a F-F where they are, but I see people trying to use both together all the time. I notice that the output Z of the 2 outputs is not identical, so that may be a clue. Jocko

1st January 2006, 09:03 PM	#10
adev diyAudio Member Join Date: Dec 2005 Location: Amsterdam	I used a simple resistor divider on the input signal of the optical output which works like a charm (don't remember the exact values anymore but i think 300&75 ohms or so will be ok). Actually, I removed the useless analog output part of the transit to route the 'coaxial' spdif through the 3.5mm jack

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