Finally, an affordable CD Transport: the Shigaclone story

[tvicol]

Originally Posted by syklab

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

Vref is given by LA9242M pin 58.
LA9242M will benefit from two low noise regulators. One is for laser and RF section and I expect that Vref to benefit as well.

What current this new 2.5V regulator need to provide ?

Regards,
Tibi

[CeeVee]

Originally Posted by tonyptony

Hmm, I did a search online for the SF-P101N-16P-DA11VZ and came up empty. Any help would be appreciated.

SANYO LASER LENS SF-P101N DA11B3VF (16P) W/MECHANISM SFP101N | eBay

puckless version

[CeeVee]

Originally Posted by tonyptony

Hmm, I did a search online for the SF-P101N-16P-DA11VZ and came up empty. Any help would be appreciated.

SF-P101N CD Mechanism SFP101 16 Pins Sanyo Philips Alba | eBay

puck version

[CeeVee]

I still don't know where to get the LCD display to use

[tvicol]

Originally Posted by CeeVee

I still don't know where to get the LCD display to use

Me too, so a standard two digit display will be used instead.
DE112RS-20/6.35 DISPLAY ELECTRONIK - Afi?aj: LCD | Transfer Multisort Elektronik

Regards,
Tibi

[tonyptony]

Originally Posted by CeeVee

SF-P101N CD Mechanism SFP101 16 Pins Sanyo Philips Alba | eBay

puck version

Thanks. The part number is a bit different. Any idea how it is different from the VZ variant?

[CeeVee]

Originally Posted by tonyptony

Thanks. The part number is a bit different. Any idea how it is different from the VZ variant?

got them both working , don't see a diference !

[CeeVee]

Originally Posted by tvicol

Me too, so a standard two digit display will be used instead.
DE112RS-20/6.35 DISPLAY ELECTRONIK - Afi?aj: LCD | Transfer Multisort Elektronik

Regards,
Tibi

Thanks Tvicol

[uncle_leon]

Originally Posted by tvicol

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

Great job with the schematic Tibi!

One thing that occurs to me after checking it, is that it still has the bypasses for all the electrolytic caps. One of the basic mods was to remove some of them, because they were detrimental to the sound, so perhaps we could remove them all at this stage? On the other hand, there is naturally no harm in making the room for them on the PCB, and leaving it up to the end user to install them or not (which is probably the best way forward).

Also, am I right in thinking that R6 (100R) should be moved to between C2 and C10?

Edit: another thought just occured to me: are we going to use 2SA608NF and 2SA1342 for Q1, Q2 and Q3, or are we replacing them with some other suitable transistors? I have just checked and both the original types seem to be available - albeit a bit scarce.

[zjaakco]

Hi tvicol
If you can make choiches for a final pcb, please consider for separete power supply and room for a decouple cap of 1000uF/16V for the motor-drive ic,
This mean 8V to the transistor, and 2x 8V for the other power pins. It save me (us) a lot of work.
If possible give every power pin a seperate power supply.
This will certain be an improvement.
Regards
zjaakco