diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Digital Source (http://www.diyaudio.com/forums/digital-source/)
-   -   Finally, an affordable CD Transport: the Shigaclone story (http://www.diyaudio.com/forums/digital-source/120229-finally-affordable-cd-transport-shigaclone-story.html)

tonyptony 11th June 2013 12:17 PM

Quote:

Originally Posted by tvicol (Post 3522647)
You need to rotate Q1 as per this picture.
http://vicol-audio.ro/img/shiga/remote.jpg

Regards,
Tibi

Sigh, I wish I could see your links from work. Will have to wait until I get home. It sounds like Q1 is not oriented properly.

tvicol 11th June 2013 01:32 PM

Quote:

Originally Posted by tvicol (Post 3522643)
I do not have a detailed idea on how CD-RW detection is working. I can only speculate that this is based on High Frequency signal level. This should be in direct relation with reflection degree witch is for CD-RW 10-25%, CD-R 40-70% while a pressed original CD have 70-90%.

The rest is done as you mentioned from datasheet:
78601-pin53 pull 9242-pin38 high and increase 9242 HF gain.

Regards,
Tibi


I did some more research and such information should be available in subcode Q-channel. So from the very beginning, in Programing Memory Area, the type of CD media should be presented to CD unit.

As per ECMA-395:
"5.4.1 Contents
The PMA can contain the following types of information:
1: Track numbers with their start and stop time. This is the table of contents for the partially recorded disc. The Track numbers of all Tracks (including Reserved and Incomplete Tracks, see chapter 5.4.1.1) in the PMA must be contiguous and increment by one.
2: Disc identification. A 24-bit binary number shall be recorded in the disc to identify each disc.
3: Skip information (optional). It is possible to indicate that an entire Track or a part of a recorded Track (a time interval) should be skipped during play back of the disc. The Skip feature is defined for Audio Sessions only.
4: The RID code in the User Data field of the blocks for Table Of Contents Items."

I other words, if there is a CD-RW, after subcode Q-channel decoding in LC78601, a flag is raised to ASP LA9242 in order to adjust gain and make CD readable.

Regards,
Tibi

See also:
Orange-Book standard (rainbow)
http://www.ecma-international.org/pu...s/Ecma-395.htm

tonyptony 12th June 2013 12:25 AM

Quote:

Originally Posted by tvicol (Post 3522647)
You need to rotate Q1 as per this picture.
http://vicol-audio.ro/img/shiga/remote.jpg

Regards,
Tibi

And now I have two working remotes. Tibi, I cannot believe that's how you intended this part of the PCB to be laid out for the transistor.

Thanks. ;)

dimkasta 12th June 2013 12:35 AM

Sigh... I started with testing the CDRW switching on my mind and ended up setting up a second salas psu for the motors... :p

Not that big of a difference to be honest (certainly not as big as using one for the digitals), but I must admit that it really needs some measuring and fine tuning. Perhaps even a boost in current since I ve seen its leds go off because the motors at some points pull too much current... It s currently set at 700mA. I ll probably go for 1A and add some extra decoupling cap right on the entrance of the pcb to help with spikes.

tvicol 12th June 2013 06:54 AM

Quote:

Originally Posted by tonyptony (Post 3523400)
And now I have two working remotes. Tibi, I cannot believe that's how you intended this part of the PCB to be laid out for the transistor.

Thanks. ;)

Yep, this is my fault. :D
BTW, remotes are shipped with a 100mA LED. Remote will work in any angle and position even from 25m.

Regards,
Tibi

Raimund 14th June 2013 11:18 AM

Quote:

Originally Posted by dimkasta (Post 3520891)
For a couple of days now I am playing CDs using the Sanyo mecha. Its quality is quite higher than the cheaper one. The spindle is perfectly centered and the sled comes pre-lubricated, while the plastic shielding adds to the overall vibration control.
...

Hi Dimitris, how did you connected the Sanyo SF-P101N (5/8) with the 16 pin cable..

regards
Raimund

dimkasta 14th June 2013 12:06 PM

I got the 16pin version

Raimund 14th June 2013 03:10 PM

Quote:

Originally Posted by dimkasta (Post 3526054)
I got the 16pin version

can you tell me where did you get the 16 pin version ..
regards
Raimund

dimkasta 14th June 2013 07:37 PM

I got it from here
New Genuine Sanyo SF P101 16P Deck Old Version Laser Head Optical Pickup | eBay

Please note that he s using Swiss Post and in many cases it can be really really really slow...

It took mine 45 days to arrive...

dimkasta 14th June 2013 09:41 PM

I have just replaced the stock C11 with a Cornell Dubilier Mica 1nF cap trying to fix my CDRW reading issues.
The increase in detail, grandeur and spatial sense was big enough to be compared to the one I had when I first upgraded the stock C8.
The cap I use is this one
CM06FD102FO3 Cornell Dubilier | Mouser

However, the mechanic became even more intolerant of CD imperfections. And CDRWs are even less readable now...

Anyway... consider me a happy diyer :)
I don t have that many CDRWs anyway...
I think it s time I started working on the enclosure...

Oh by the way, I also got some small heatsinks to mount on the bridge chip. However, they do not come with an adhesive tape or anything... Any idea how to mount them? Should thermal paste be enough? They are pretty small and light.


All times are GMT. The time now is 12:20 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2