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Old 24th February 2012, 07:07 PM   #5411
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I would like to order some mechs before they run out... which one is currently considered best? The 3-ball or open mechanism?
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Old 24th February 2012, 07:10 PM   #5412
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by studiostevus View Post
I would like to order some mechs before they run out... which one is currently considered best? The 3-ball or open mechanism?
That's not likely any time soon....there are many on the net....they are so cheap you should try both and make up your own mind....myself i prefer open type.....but that's just me.
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Old 24th February 2012, 09:16 PM   #5413
CeeVee is offline CeeVee  Portugal
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Just a question,

where will we find the LCD display itself ?
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Old 24th February 2012, 09:29 PM   #5414
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Jut another piece of the puzzle. Tonight I went back at the 3 ball mech. I had also noticed that it was more sensitive to marks on the CD than the regular transport (I have 2 shigaclones side by side at the moment to test, one with the normal puck and the other with the 3 ball type). Anyway I seemed to remember somewhere from the bowels of my mind that someone had mentioned a problem like this and that it was due to a slight bend in the mech. So I slackened off the mounting bolts (mounted on 2 stands as per the okapi mods) and lo and behold!! the sound all came right!!

I must have just cranked down on them too hard. I went back and just "pinched" the 2 screws tight and its all AOK now. Sound is indistinguishable from the magnetic puck now - good news I think for everyone. It is still a little more sensitive to marks on the CD than my other mag puck shiga, but not as bad as before. This may even be due to variation from one selection to the other.


This brings me back to one of the early discoveries in this thread - for any new shiga people here, please bear in mind that the physical mounting of the mechanism is very important indeed. 2 posts in opposite corners, fixed to high mass, and that whole mass sitting on a compliant base, eg 4 springs. It would be well worth each of your time to go back through all 5413 posts on this thread so far and quickly read through them. Also, I have most if not all of the PDFs and critical drawings etc saved (I think) if people need them. Might not be any harm to start a new "building the ...." type thread if the group buy comes off. The first post of that thread will be editable forever, and pertinent pdfs, jpegs, main findings about power supplies, clocks etc etc and so on could all be added there to keep them in one place as the thread grows.


Fran
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Old 24th February 2012, 09:45 PM   #5415
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Fran,
I have an unfinished one sitting ready to begin. I would appreciate those files.
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Old 24th February 2012, 10:34 PM   #5416
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Here's the main ones:


This is a collection of stuff..... some not of interest maybe anymore. The acrylic puck is the actual 47 labs one. I also have the original okapi mods PDF, but its too big to upload here. If a google search doesn't turn it up for you, send me a pm with your email address and I'll email it to you. Likewise for the EZ31 manual.
Attached Images
File Type: jpg 8V circuit.jpg (40.8 KB, 465 views)
File Type: jpg acrylic puck and platter.jpg (176.6 KB, 464 views)
File Type: jpg display3.jpg (96.2 KB, 445 views)
File Type: jpg platter drawing.jpg (100.5 KB, 432 views)
File Type: jpg ps.jpg (19.5 KB, 429 views)
File Type: jpg replacement mech.JPG (101.6 KB, 155 views)
File Type: jpg spdif.jpg (12.5 KB, 157 views)
File Type: jpg TL0Sch.jpg (88.6 KB, 158 views)
Attached Files
File Type: pdf Shigaclone mods.pdf (14.2 KB, 106 views)
File Type: pdf shigaclone mods pt2.pdf (15.7 KB, 103 views)

Last edited by woodturner-fran; 24th February 2012 at 10:37 PM.
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Old 24th February 2012, 10:46 PM   #5417
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Oh yeah - another thing. I've mentioned them a load of times in this thread but no-one has used them (here) other than me.

The shiga puts out a TTL level S/PDIF signal - too high for most DACS. Most use a resistor combination to drop the level to 0.5V, using all sorts of combinations of fancy resistors, riken and the like to get there.

A better sounding alternative (IMHO) is to use RF attenuators to drop the signal to 0.5V or lower. These attenuators are precision lab devices available from minicircuits.com and cost about 12-15$ each. Look up part# HAT-6-75. Its the precision 75dB ones you want.
Click the image to open in full size.

I would recommend anyone to try them, maybe buy 1 x 6dB, 1 x 10dB and 1 x 15dB. You can stack them in series to try out different levels. Note that they are BNC only, so you want to figure on that.

Main page here: http://www.minicircuits.com/products...ax_fixed.shtml

HAT-6-75 here: http://www.minicircuits.com/pdfs/HAT-6-75.pdf

Fran

Last edited by woodturner-fran; 24th February 2012 at 10:50 PM.
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Old 26th February 2012, 03:52 PM   #5418
tvicol is offline tvicol  Romania
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Here is the schematic of the new shiga.
There are few modifications who will allow you to improve further the performance of this transport:

1. entire LC78601RE audio section removed
2. option to use original oscillator or a low jitter XO, aka Tentlabs.
3. separate power supply for each chip
- external 8V for BTL driver LA6541
- +5v for display IR using build-in LA6541 regulator
- power supply for LA9242M is split in two separate sections. One +5V for RF section - pin 64 -, laser and pin diodes and second +5V for servo and digital section - pin 56.
- last +5V regulator is for LC78601RE
4. option to use two regulated +8V. One will go directly to LA6541, second for cascaded LT1763-5 regulators.
5. 4 button display board
6. s/pdif is on board - R50 and R51

Except display and IR all other +5V regulators are low noise LT1763-5 and will be on main board.
You don't like this approach ? Just strap each regulator section using 0ohm resistors - R25, R44

If you have any observations and/or further modifications you like to be included, please let me know.
Please note that this is not final schematic and during PCB design may suffer further small changes.

Regards,
Tibi
Attached Files
File Type: pdf shigaclone_diyaudio_26022012.pdf (113.9 KB, 195 views)

Last edited by tvicol; 26th February 2012 at 04:16 PM.
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Old 26th February 2012, 04:44 PM   #5419
syklab is offline syklab  Hong Kong
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Hi Tibi,
Dr.H did mention that feeding a regulated 2.5VDC to C906 would eliminate the need of exotic cap there. what is your opinion on this? Should we have an additional 2.5V supply for this?

Finally, an affordable CD Transport: the Shigaclone story
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Old 26th February 2012, 04:46 PM   #5420
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Quote:
Originally Posted by CeeVee View Post
That's not likely any time soon....there are many on the net....they are so cheap you should try both and make up your own mind....myself i prefer open type.....but that's just me.
Hmm, I did a search online for the SF-P101N-16P-DA11VZ and came up empty. Any help would be appreciated.
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