CDROM TTL signal to toslink receiver - diyAudio
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Old 18th April 2008, 06:18 AM   #1
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Default 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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Old 18th April 2008, 08:37 AM   #2
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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 .

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Old 18th April 2008, 12:18 PM   #3
decky is offline decky  Australia
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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?
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Old 18th April 2008, 12:39 PM   #4
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I think it's good

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

Click the image to open in full size.

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