Finally, an affordable CD Transport: the Shigaclone story - Page 585 - diyAudio
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Old 23rd May 2012, 07:56 AM   #5841
tvicol is offline tvicol  Romania
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We have received price offer from LCD manufacturer.
We manged to get a smaller quantity but at a higher price. Expected final price will be 6 euro/custom LCD.
We will receive first LCD samples in 1-2 weeks from now and final batch in 2 months.

You have now column H for LCD on https://docs.google.com/spreadsheet/...ZSlNWR2c#gid=0
I suggest all of you to subscribe for this component as this type of LCD is impossible to find elsewhere.

Also the BOM was updated with distributor codes and links, so you may start to collect necessary parts till LCDs are ready.
https://docs.google.com/spreadsheet/...ERodi1xSldyUUE

We are going to start collecting money after prototype testing.

Regards,
Tibi

Last edited by tvicol; 23rd May 2012 at 08:00 AM.
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Old 23rd May 2012, 09:33 AM   #5842
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WONDERFUL
I am curios how it "ring" I mind play a music.
Nice indeed
Regard
Ivo-Cici

Last edited by Ivo-Cici; 23rd May 2012 at 09:40 AM.
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Old 23rd May 2012, 10:51 AM   #5843
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Quote:
Originally Posted by Jean-Charles View Post
Fran, BTW, uncle_leon,
I would appreciate you guide me towards posts or thread, to read more about what you three have done with the attenuators.
I think here is more or less the start of the story:
Finally, an affordable CD Transport: the Shigaclone story

Or you can search the thread for "attenuator"

Quote:
Originally Posted by syklab View Post
Hi uncle-leon,
I don't get it, isn't the attenuators are also resistors network?
Well, technically, they are. So theoretically, there should be no advantage from using them. But ever since I started experimenting with my hand-made parts, I have been repeatedly shown that theory is one thing and practise another.
My explanation of this particular case is that while the attenuator is not much better than resistors (if at all) on electrical level, I have a feeling it has a better "vibrational" characteristic (i.e. the sort of "vibration" that 47 Labs base their design on).
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Old 23rd May 2012, 09:41 PM   #5844
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Uncle_leon - I haven't my comparison at all yet, hoping to get to it this weekend.....


There has been much discussion of why the attenuators do what they do. But the sense of it as I picked it up:

They are precision 75R devices, so you get less reflections down your cable from impedance mismatches (I know, why does it work then with a BNC to RCA adapter).

As the height of the SPDIF signal drops, the rise time is shorter, making for a more precise square wave.

Result of both things is lower jitter I understand.


I'll try to root out the link etc but I remember scope shots etc to show all this.

Last edited by woodturner-fran; 23rd May 2012 at 09:45 PM.
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Old 24th May 2012, 03:04 AM   #5845
TheGimp is offline TheGimp  United States
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Tibi,

Thanks for all your effort, and the effort of those assisting you.

I personally do not see 6Euro as expensive since the cheapest price I've seen on ebay for a 2X40 LCD display with shipping is about 5.8 Euro. In the grand scheme of things I believe this is quite reasonable and I applaud you for your accomplishment.
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Old 4th June 2012, 05:53 AM   #5846
sigurd is offline sigurd  Belgium
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Hi all on this fantastic site,

THE JVC RC-ST1 is the SAME as EZ31 ( has the same IC'S) but is more difficult to mod because all the stuff is on 1 single PCB.
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Old 7th June 2012, 07:40 AM   #5847
tvicol is offline tvicol  Romania
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Many of you are looking for the best components available for this project. We have conformed and updated the BOM with best components currently available on market - see column L. The quality is, of course, reflected in price. :-)
Ceramic capacitors are NP0, with very small piezoelectric effect. Electrolytic capacitors have been selected from polymer family. Resistors are melf with very low tolerance 0,1%. The rest of components are also selected from the best we are aware off.


Best Regards,
Tibi

Last edited by tvicol; 7th June 2012 at 07:45 AM.
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Old 8th June 2012, 05:35 AM   #5848
tvicol is offline tvicol  Romania
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Latest shiga shematic with several corrections - correct drawing for Sanyo chips and IR decoupling capacitor moved to the right pin.

Regards,
Tibi
Attached Files
File Type: pdf shigaclone_diyaudio_rev5_06062012.pdf (157.5 KB, 233 views)
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Old 18th June 2012, 06:35 PM   #5849
tvicol is offline tvicol  Romania
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We have great progress on this project.
The first shigaclone is running.
There are few modifications and tests to be run, in the next days, for fine tuning.
The components values are critical and we fond several discrepancies between original shiga and published JVC schematic.

A small movie First vicol-audio shigaclone tests - YouTube

We are still waiting for first LCD samples, therefore original display was used.
More episodes in the comming days.

Best Regards,
Tibi

Last edited by tvicol; 18th June 2012 at 06:44 PM.
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Old 18th June 2012, 06:49 PM   #5850
valo is offline valo  Norway
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NIce work, cant wait to get my board
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