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CDROM control KITs VFD version

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#152
JesseG said:


The digital out on CD-ROM drives is already buffered S/PDIF, ready for coax to an outboard DAC. The S/PDIF is spec'd for 5V TTL levels. There is no risk of hurting any DAC by sending this signal direct through a coax cable into your DAC, Received or whatever. 😀

Just use a 2-pin mini molex cable (you can trim off two pins from a 4-pin connector easily) and solder the wires to an RCA jack. Make sure that the wire that connects to the G pin goes to the center of the RCA (so the wire from the G <ground> wire goes to the barrel of the RCA). This is the digital ground, so DO NOT ground of the RCA to the chassis of whatever chassis your CD-ROM is mounted in.

Now, just plug a decent 50ohm Coax cable between this new RCA and your coax input and away you go!

I have always found that coax S/PDIF sounds better that Toslink, but whatever you prefer.

Jess
Click to expand...


Hi, JesseG
Can you explain clearly how to connect the digital out from the cd-rom to The DAC.

"Make sure that the wire that connects to the G pin goes to the center of the RCA "

Why G pin goes to the center of the RCA? if G pin stand for ground.so why Ground connect to center of the RCA? center of RCA should be positive. is that right? please correct me if i wrong.

Thanks.
 
#153
"I2S" out

Was able to tap into the LRCK, BCL and Data of the CDROM controller chip. This is feeding the asynchronous reclocker "Metronome" from Twistedpearaudio.com At first there was not sound because the input of the reclocker was set to 24bit I2S. Then I changed it to 16 bit right justified and I am getting sound. In theory, this interface is better than SPDIF.

So basically there are 3 signals plus gnd. I routed the signals to the analog plug in the back of the CDROM (which has 4 pins) after disconnecting the analog traces and used the common analog wire found in cdroms and computers. this cable ideal since it has 3 signal wires and a ground shield.

Metronome feeds the DAC, which is the OPUS DAC from twistedpearaudio.com
 
#156
Hi all
Thanks these days to share with me something about the CDROM Control kit~
I found that the foreign DIY friends are very kind.
Now the CDROM Control kit with VFD display only one kit left~I also have the LCD version when the VFD's sold out.
The price for the LCD version is very low.Total for one kit just cost 32USD.

Thanks
Huang
 
#157
Hi, JesseG
Can you explain clearly how to connect the digital out from the cd-rom to The DAC.

"Make sure that the wire that connects to the G pin goes to the center of the RCA "

Why G pin goes to the center of the RCA? if G pin stand for ground.so why Ground connect to center of the RCA? center of RCA should be positive. is that right? please correct me if i wrong.
Click to expand...

Hello robertc

You are absolutely correct - my post was a case of momentary dyslexia, sorry:xeye:

I should have said that the wires connecting to the R & L pins connect to the center of the rifgr and left RCAs respectively and the wires connecting to the two G pins (the two in the middle of the CD-ROM connector) each go to the barrel (outside) of the RCAs viewed from the back, the connector on the CD-ROM drive looks like this:
L G G R
[* * * *]

Sorry for any confusion...

Jess
 
#159
daddy4life85 said:
Well I don't get paid until friday.... will you get more of the VFD version in? I don't really want the LCD. Do you have pictures of the LCD in action?
Click to expand...


Hi daddy4life85

The supplier out of stock.So i can't get more VFD in a few days.You can book the last one kit with VFD.I can wait your payment for a week.I will upload some LCD pictures later~Just the display is different.And the color of the mainboard are change to blue~

Thanks
Huang
 
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