The CD Transport

[uncle_leon]

Freeman, JVCs are still available in the UK, at £50 per unit. If you're desperate to get one, I'm willing to buy it, extract the CD mechanism and post it to you (if you pay for the boombox and international postage, of course).

 

[freeman]

Thanks for the offer uncle_leon. Very kind. I found an rc-ez51 on e-bay uk which is the equivalent in the states...correct? Before I take you up on your offer, let me check their shipping rates. best regards.

 

[uncle_leon]

No problem, let me know what you decide. Yes, rc-ez51 is the correct model, although if you live in the US I think you might need a different transformer.

 

[BigE]

Is there any reason that the unit cannot be modified with spdif added to the original
boombox?

I don't want to make a special enclosure for it, or pull out the guts. And I don't have to worry about messing with the controls!

 

[Peter Daniel]

Sure it can be done, see this: http://www.diyaudio.com/forums/digi...ansport-shigaclone-story-214.html#post2473787

 

[pforeman]

2nd smd cap location

I also remove ceramic bypasses for those two electrolytics, altogether 5 parts.

I found and removed the smd cap in the first picture. The second smd cap is
around the corner of the heat shield under the now removed coil?
Thanks
Paul

 

[Peter Daniel]

Yes, that's where it is.

 

[audiophail]

Minor derailed question, is it wise to use an expensive cd player as transport?? Does the internal DAC shuts off or both internal and external DAC work together?

 

[Peter Daniel]

If the external DAC is better than the one inside the CD Player, that it's certainly reasonable to use expensive player just as a transport. The internal DAC is always on, just not being used.

 

[audiophail]

In theory, if you asynchronous the transport, would you have 0 jitter, have you tried that? Also DSD(SACD) to PCM conversion on the output stage to DAC would mean higher quality SACD, would you have higher quality SACD?

 

[audiophail]

Do you have more time on this project?

In theory, if you asynchronous the transport(transport = slave, DAC = master/mistress), you have 0 jitter, have you tried that? Also DSD(SACD) to PCM conversion on the output stage to DAC would result in high resolution PCM. if you have a high quality DAC, wouldn't your SACDs sound even better?

I don't have the skills or time to create such device. The market lacks, might not even have, those wonderful transports and it shouldn't cost a lot, instead they'll sell you a $7,000 transport with low jitter.

One more thing, since youtube and computer audio is increasingly popular, transportwith asynchronous firewire/usb to coaxial converter. Excellent usb/firewire to spdif/coaxial converters today require external battery/AC cord to isolate from noisy USB/firewire power, the transport can use it's own PSU. Firewire is proven to be overall better.

Zero jitter, Computer audio, Better SACD quality, Low cost. Such a thing never been made.


By the way, I'm in the core of Toronto.

 

[billo44]

JVC display board

Dear all,
I hope it isn't out of place to post this here.

I have found a locally available Sanyo boombox with the same laser unit and board, and built a reasonable clone. I'm about to start version 2...
The Sanyo display board is inferior in that it does not have a back lit display.

I was wondering if anyone might have had a regrettable bad laser unit, meaning they would have a spare display board (or three) from the JVC Unit?

Please PM if you can help... not expecting charity of course.

Best regards
Bill

 

[uncle_leon]

Have you got any pictures? The JVC display backlight is actually very simple. It's mostly just a ridged "glass" wedge behind the LCD, a sheet of white plastic behind the glass (to relfect/diffuse light), and an LED. Depending on your DIY skills and available tools, you should be able to make your own fairly easily. This way you could also choose your own light colour, vary diffusion level etc.

Also, what Sanyo model is it? If it indeed uses the same CD board, it might be available in places where you can't get the JVC. I'm sure many people would appreciate the info.

 

[billo44]

Uncle Leon,
I might try to strip down a display board and have a look.
I did post the model details for the Sanyo beep box (couldn't call it a boom box) and a few pics a ways back here...

http://www.diyaudio.com/forums/digital-source/120229-finally-affordable-cd-transport-shigaclone-story-414.html#post2341172

So far I haven't heard of anyone finding them in other countries.
I also posted my approach to identifying a suitable donor in the shop without buying one and stripping it apart....
http://www.diyaudio.com/forums/audio-sector/160373-cd-transport-12.html#post2364307

You are from my neck of the woods BTW Uncle Leon... I emigrated from Widnes (lovely resort on the banks of the Mersey!).

Cheers folks, happy may day!
Bill

 

[deepblue2010]

The schematic show external PS. Two wires from PS are connected to the pads where choke was. Since BG FK is hard to find these days, I use BG STD with BG N 4.7uF bypass.

I add two output resistors: 300/100 Dale (you may also consider S102/Caddock) and in place of C916 I instal BG N, either 47/50 or 33/16 depending on availability.

Hi Peter,

The BGs are really hard to find now.
For alternatives, can I use ROE 2200/63 GOLD instead of BG FK 2200/35. Or if using bypass scheme, Pana FC 1000/25 + Frako 4.7/63?
Pana 1000/25 will be used in place of BG STD 1000/25?
And ELNA SILMIC II 47/50 in place of BG N 47/50?

What do you commment?
Thanks,
HT

 

[uncle_leon]

Hi deepblue2010, I hope Peter won't mind me answering this for him - the type of capacitor is much more important here, than matching the exact value. Black gates are unfortunately the best, and there are no capacitors that I'm aware of, that would be nearly as good.

Panasonic FC are a very poor choice for the Shigaclone, and Elna Silmic are not much better. Rubycons and Os-Con currently have my recommendation for the PSU - but I am still in the process of testing various caps, so this may change soon. I have not tried ROE caps yet, so can't comment on them.

The best non-Black Gate substitute for C916 known to me is Elna Starget 47/16.

I'm sure Peter will correct me if I missed anything.

 

[deepblue2010]

Uncle Leon,

As many people mentioned, high performance BGs are like "holy grail" for audiophile grade but I think for controlling the mechanical components, as in CD transport, I might use some other (also high grade) caps and it would not affect too much while still improve the quality. That's why I asked . Seems I need to look back all the related posts and find out what are the specifications of high performance CD transport, exp. Shigaclone before getting back to cap selection.
Anyway, your work help to narrow my research a lot. Thanks so much.
And I am willing to read your next post about your test with Shigaclone.

Many thanks and regards,
HT

 

[uncle_leon]

Deepblue2010, check out my capacitor test results in the main Shigaclone thread:
The big capacitor test results.

Improving the power supply of mechanical components (like gear and spinner motors) actually has audible influence on the sound. I know it may seem odd, but don't neglect them just because they aren't in the signal path If you have any suitable Black Gates, do not hesitate to use them here. Just remember that different BG have different sonic signatures, and not all of them work well together.
You can also check out my previous tests:
capacitors
and
other parts

 

[syklab]

Hi Uncle_leon,

I read from Peter's post that the 5V can be added by tap into the L901 after removing it.
Does it also mean you have to put 2 jumper wire there to reconnect the trace line? What is the best way of feeding a separated regulated 5V to the the Shigaclone?

Thanks

 

[Peter Daniel]

When removing L901, connect the voltage and ground directly to L901 secondary pads, no need for any jumpers.

Best way to feed separate reg 5V is from a separate transformer.

Attachment shows how to connect external 5V supply.