Finally, an affordable CD Transport: the Shigaclone story

[luvdunhill]

Peter: I like the ML31.5 approach the best. A few questions:

1.) how tall are the springs with no load
2.) what is the outside diameter of the spring
3.) how tall are the springs with the load
4.) how much does the load weight?
5.) what is the shape of the wire: square, oval, round?

I think we can find these easily. Also, the socket caps should be easy to find as well.

I will calculate the resonant frequency of the above and then scale it to how much my metal frame will weigh and choose the spring based on this.

 

[kevinkr]

Peter: I like the ML31.5 approach the best. A few questions:

1.) how tall are the springs with no load
2.) what is the outside diameter of the spring
3.) how tall are the springs with the load
4.) how much does the load weight?
5.) what is the shape of the wire: square, oval, round?

I think we can find these easily. Also, the socket caps should be easy to find as well.

I will calculate the resonant frequency of the above and then scale it to how much my metal frame will weigh and choose the spring based on this.

Good approach, but don't assume that this will get you all the way, I would recommend getting springs having characteristics that bracket the calculated value by a wide margin. What ends up working best may not be what you initially calculated. (For example how do you choose the optimum resonant frequency for the mechanism mass given other variables like what you have it placed on? And its resonances..)

 

[MrMajestic]

I have one spare EZ31 that I could part with if someone is interested. Realized I went a bit shop-happy when I found out they were in stock here

The player is no longer available. Its on its way to Norway for maming and mutilation

 

[superhkm]

Parts ordered. Mutilation to come.

 

[Peter Daniel]

Peter: I like the ML31.5 approach the best. A few questions:

1.) how tall are the springs with no load
2.) what is the outside diameter of the spring
3.) how tall are the springs with the load
4.) how much does the load weight?
5.) what is the shape of the wire: square, oval, round?

I think we can find these easily. Also, the socket caps should be easy to find as well.

I will calculate the resonant frequency of the above and then scale it to how much my metal frame will weigh and choose the spring based on this.

IIRC, the load (lead frame) is 5kg, the spring dia is 1". They are approx. 2" tall , the wire is round and they don't compress more than 0.1" under the load.

 

[kevinkr]

Parts ordered. Mutilation to come.

My wife was pretty horrified by the whole mutilation part of it. (Oh, the horror of it.. ) Might best keep loved ones away from the scene of the surgery..

 

[Zigis]

Thank you Franz for your kind offer, it is really hard to find DIP package today. I can't send you mail from here, can you mail me to zigisg/at/inbox.lv

Finally? Nothing is finally, in my audio setup

Yes, I now this feeling

Peter Daniel, where can I see your DACs ?

Zigis.

 

[JC Fardo]

IIRC, the load (lead frame) is 5kg, the spring dia is 1". They are approx. 2" tall , the wire is round and they don't compress more than 0.1" under the load.

Could you please tell us what is the wire diameter. It´s also a helpful detail, if you don´t mind.

Assuming springs are made of "music" or harmonic wire, we are near to target.

Thanks a lot

 

[Ed LaFontaine]

Swag

Could you please tell us what is the wire diameter?

Scaling from the photo Peter provided, I'll go out on a limb and guesstimate 0.079", +/- 0.005"

 

[JC Fardo]

Re: Swag

Scaling from the photo Peter provided, I'll go out on a limb and guesstimate 0.079", +/- 0.005"

Exactly 2,0mm +/- guestimate margin. Not bad, Ed. Thanks

 

[JC Fardo]

BTW. The "mutilation team" could report how is the original EZ31 CD mechanism secured. Solid to floppy plastic I guess.

Thanks

 

[Ed LaFontaine]

Durn, I missed it by ~0.0003".

 

[johnm]

Question for Peter:

Out of interest, have you considered doing - or have done - a comparison between your Shigaraki 'clone' running your NOS DAC, with your laptop/PC running lossless or WAV files into your USB NOS DAC.

I'd love to know which sounds best in your opinion. In theory, at least, the PC option should have the upper hand as (assuming one is using a decent 'bit perfect' ripper like EAC) you have already got the data to hand in a 'perfect' state. Whereas the transport has to read the disc/correct any errors etc in real-time. And even then we can never be sure if the result is bit-perfect or not.

I'm hoping to do something similar very soon when I have my USB-SPDIF converter finished. I'll then try running the same tracks from PC and Shiga-clone into my DPA DAC and see what happens...

Just a thought

 

[Algar_emi]

All the EZ31B that I had are sold. Last one is reserved to John Joseph.
I travel a lot for work. I may be able to get some more around Quebec.
If there is some real interest from other members, I may find a few more.

So, don't desperate just yet. If you still want one, send me an email. We will see.

 

[Jean-Charles]

For a good language tool you could use Google.
You can almost translate anything with it, particularly usefull to translate an entire web page.

Polish to English is available.

http://www.google.ca/language_tools?hl=en

Jean-Charles

 

[quan]

shigaclone

Hi guys, need help -again ,accidentally i destroyed the pad for positive 8v in -position -old choke was removed-was using a drill to widen the hole but went too far thus stripped all pad!!
How do i go about fixing the problem.
Could direct connection to C902 work?

 

[quan]

Also ,the C902 was very hot and smoked++
Is the board single layer?
Any idea what could be the problem.
I have double check all replacement parts and orientation-seems ok.

 

[Ed LaFontaine]

McMaster-Carr item #9657K101 $13.48 for 12+shipping

The spring is a suggestion. I'll be going to my local hardware store 1st.

Hooray! The mailman brought an EZ31 to my door this morning. Thanks, Leonard!

I plan to use a lighter platform for the mechanism than Peter's. I'm thinking I will use o-rings to "load" the compression springs.

 

[hayenc]

Thanks for the spring reference. Amazon has similar through Small Parts if you don't want 12. Ace did not quite have anything with a diameter that large.

 

[luvdunhill]

McMaster-Carr item #9657K101 $13.48 for 12+shipping

The spring is a suggestion. I'll be going to my local hardware store 1st.

Hooray! The mailman brought an EZ31 to my door this morning. Thanks, Leonard!

I plan to use a lighter platform for the mechanism than Peter's. I'm thinking I will use o-rings to "load" the compression springs.

That one was top of my list too! I think you are channeling my thoughts through my motor pod plate!

I get around 3.6Hz resonance for the proposed platform I'll be using. I think keeping it under 4 Hz or so is reasonable, so for this spring a minimum mass would be 4.31kg.