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Old 15th February 2012, 12:03 PM   #11
marce is offline marce  United Kingdom
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Yes, but you can only determine any 'digital noise' levels with a scope, no.
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Old 15th February 2012, 03:30 PM   #12
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Of course, only a scope could analyze it... but there also are some kind of audible "consequences" when we are in the presence of MANY digital noise, especially with a faulty DAC !
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Old 15th February 2012, 03:49 PM   #13
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i looked in my supplyers but no one sells the teac dv-5010A
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Old 16th February 2012, 05:06 AM   #14
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Thanks, lduarte.
My hope is I (we) could find it somewhere...
Seems that improvements on mech and error correction system makes the difference in such a player (if compared to "normal"/commercial CDROMs) but I suspect it could cost MUCH more than we'd think... :/
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Old 16th February 2012, 04:34 PM   #15
marce is offline marce  United Kingdom
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It would be an interesting experiment to see what circuitry is affected and how downstream of a digital convertor or a digital system. The problem is then the frequency of the digital system and the base noise it also creates. I do PCB for communications and we have looked at the resulting analogue signals using a 13GHz scope, the analogue waveform was fuzzy with the digital noise, but was quite low level, but still present. This was a system with fast FPGA and DDR memory, similar to the noise you will get in a PC.
Galvonic isolation and a totaly seperate analogue section would be best but impossible to do with an DAC, so isolating the noisy low level analogue from further amplication.
It is a problem that is going to increase as just about everything has some digital devices in them, and the proliferation of wireless devices etc is creating a noisy envoironment.
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Old 16th February 2012, 07:37 PM   #16
Jempie is offline Jempie  Indonesia
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hello,

i have try all three ABC, but the same results, it seems some groundings
problem...
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Old 17th February 2012, 08:28 AM   #17
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Mah ?!?!?? Even in the "C" situation ?!?!?? You have a "regular" CDplayer connected via "regular" 75 Ohm coaxial cable to your DIYCDP internal DAC and you still hear noises ?
Then, if you also tried the other 2 situations, it should mean that noise does NOT come from the TTL-to-coaxSPDIF interface...
In the three situations you have to switch on the DIYCDP power, right ?
Try to disconnect what you doesn't need for the situation you are trying.
So, if you don't need the display then turn it off !
Don't want to say bu....it, so I'd better pass the ball to someone smarter than me about this argument... !

Any news about the Teac CDROM ?
No one found "in the wild" ?
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Old 18th February 2012, 12:39 PM   #18
Jempie is offline Jempie  Indonesia
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when you messure the ground and the cover of the Teac 5010A they are not connected
when you do that with another dvd-rom they are connected

it seems that the ground of any cd player with cd rom drive the chassis is not connected to ground only the digital ground is connected to ground
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Old 18th February 2012, 08:30 PM   #19
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Quote:
Originally Posted by Jempie View Post
when you messure the ground and the cover of the Teac 5010A they are not connected...
How could you know this ?
Do you OWN a 5010A ?
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Old 29th February 2012, 07:09 PM   #20
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Controller arrived, installed and tested: OK!

DIYCDP_Clip_01.MOV - YouTube

Work_STILL_In_Progress ...

As I said, I have several CD-RW and DVD-ROM and I have tested 6, but I used one of the three Pioneer "slot-in" because it seems (SEEMS...) mechanically quieter than the others, although I still have not "tested" other "features" ... Someone knows models of DVD players / recorders "suitable" for such use?
And, again: any news about a POSSIBLE (?!?!?) way to get those "notorious" Teac 5010A or 5020A?
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