CDROM TTL signal to toslink receiver

DECKY999 · 18th April 2008, 07:18 AM

I am building a CDROM based player and I am planning to use DAC-AH with CX8414 (same as CS8414) receiver chip.

I was thinking to take off an onboard Toslink optical receiver and plug TTL output from CDrom directly where the output pin of the Toslink receive used to be. Is this going to work and is there any danger to the receiver chip?

I would guess that I need 0.1uF caps in the line with both signal and ground.

Sergelisses · 18th April 2008, 09:37 AM

Hi ,

I don't realy understand your idea

You connect directly the TTL CDROM output into the DAC AH .
Perhaps is not a good link TTL output to a 75Ohm input but normaly it works .

Serge

decky · 18th April 2008, 01:18 PM

Maybe I should explain better. I have a CDROM that has a TTL level output that I use as a transport. I planing planning to put this CDROM and a DAC-AH in the same case.

The plan is to remove the TOTX178 optical receiver from the DAC-AH PCB and to connect the CDROM TTL output directly to where the output pin of the receiver used to be. I thought that should be OK since the DAC receiver (CS8414 chip) expects the TTL level signal from the TOTX178 anyway. Do you see any problem with this?

Sergelisses · 18th April 2008, 01:39 PM

hi,

I think it's good

If yo have a scope and the Signal is not ok ,try this little circuit .

Serge

18th April 2008, 07:18 AM	#1
DECKY999 diyAudio Member Join Date: Jul 2007	CDROM TTL signal to toslink receiver I am building a CDROM based player and I am planning to use DAC-AH with CX8414 (same as CS8414) receiver chip. I was thinking to take off an onboard Toslink optical receiver and plug TTL output from CDrom directly where the output pin of the Toslink receive used to be. Is this going to work and is there any danger to the receiver chip? I would guess that I need 0.1uF caps in the line with both signal and ground. __________________ The only true way is no way.

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18th April 2008, 09:37 AM	#2
Sergelisses diyAudio Member Join Date: Nov 2003 Location: Near PARIS	Hi , I don't realy understand your idea You connect directly the TTL CDROM output into the DAC AH . Perhaps is not a good link TTL output to a 75Ohm input but normaly it works . Serge

18th April 2008, 01:18 PM	#3
decky diyAudio Member Join Date: Sep 2006	Maybe I should explain better. I have a CDROM that has a TTL level output that I use as a transport. I planing planning to put this CDROM and a DAC-AH in the same case. The plan is to remove the TOTX178 optical receiver from the DAC-AH PCB and to connect the CDROM TTL output directly to where the output pin of the receiver used to be. I thought that should be OK since the DAC receiver (CS8414 chip) expects the TTL level signal from the TOTX178 anyway. Do you see any problem with this?

18th April 2008, 01:39 PM	#4
Sergelisses diyAudio Member Join Date: Nov 2003 Location: Near PARIS	hi, I think it's good If yo have a scope and the Signal is not ok ,try this little circuit . Serge