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Old 12th August 2012, 11:10 PM   #6201
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Red face On the Subject of Pucks

I read with great interest the information and opinions on pucks given in the last pages. In particular, Peter Daniels comments and the link he suggested. What I took from it all was that the puck has different jobs.

1. The puck helps transfer torque from the motor table to the CD.
2. The puck holds the CD down on the motor table.
3. Sometimes, the puck helps control vibration in the CD. It is possible a bad puck can make vibration worse.
4. The puck needs to do all of this without adding too much strain to the motor and its bearings.

Of these functions, I am trying to understand their importance.

That sent me off to look at a couple of commercially produced approaches. The one that I found most interesting was in a Philips-Magnavox boombox I have around. That puck is molded plastic (Polystyrene maybe?) and doesn't have much mass. It is a hollow cylinder, about 28 mm in diameter with a pilot for the motor table center hole and cone. Around its outer edge, it has a ring of soft rubber that engages the CD.

Outside of this, there is a disc of flexible plastic sheet, probably less than 1 mm thick and 75 mm in diameter. On the bottom side of the disc, there is a ring of soft, cloth like fibers. My guess is that the disc and the fibers are intended to cover the laser when there is no CD. It is also possible that the disc and fibers provide some damping to vibration.

I like the idea of the soft rubber ring providing traction between the puck and the CD. I wonder why you wouldn't put rubber for traction on the motor table instead?

In the end, as Peter said, he has tried different kinds of pucks and the sound has been good. Maybe we shouldn't obsess too much and just use a simple puck.

Jac
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Old 13th August 2012, 12:49 AM   #6202
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Default CD Pucks

Jac,

The consensus is that a magnet Puck affects the CD laser servos...at least for the first few minutes when the laser is reading from the inside of the disc. But then again, Peter and other folks whose ears I trust have settled on various magnetic Puck.

My fall back is the magnetic CD Clamp I described...$3 for the magnet, which you could use as is with the right interface thickness spacer, and it self centers on the CD Turntable's molded in upper tapper. You can always add wood, plastic, etc to make it pretty and then obsess over whether it is perfectly balanced, while hoping the CD itself is also balanced. Based on the various manufacturing tolerances, good luck on the latter always being the case...but remember, it is only turning 500 rpm at the start and down to 200 rpm at the end.

I am also looking for a metal insert with a threaded ID that will fit into the Sanyo CD Turntable center hole. That would allow making a low mass screw-down Puck work. At a start-up speed of 500 rpm, not much clamping force is needed and with a rubber interface you suggested on the Turntable and Puck, there would be very little chance for slip.

So there are options. There are various manufacturers who will likewise sell you a CD Puck...mostly magnetic one. ARC, Naim and others come to mind.

It's a hobby...and addicting one, and up to a point some obsession is OK. But this transport is going to be killer...better than or at least the equal to the best available at any price...until Tibi, Peter or someone else comes up with something "better". That seems to always happen...
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Old 13th August 2012, 12:30 PM   #6203
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Quote:
Originally Posted by Sean Henderson View Post
...

So there are options. There are various manufacturers who will likewise sell you a CD Puck...mostly magnetic one. ARC, Naim and others come to mind.

...
Naim puck will not work due inner hole is too small. Already tested by me.

Regards,
Tibi
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Old 16th August 2012, 11:09 AM   #6204
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@tivol When will the orders send to the customers?
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Old 16th August 2012, 06:15 PM   #6205
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Can someone confirm if the EZ35 could be used?
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Old 16th August 2012, 06:42 PM   #6206
tvicol is offline tvicol  Romania
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Quote:
Originally Posted by Pjotr27 View Post
@tivol When will the orders send to the customers?
Still waiting for LCD's to arrive from factory. Also, the PCB boards are still in production.
We expect to have trafo's, for those who ordered Shiga ready mounted and tested, at the end of next week.

The great news it that we were able to source a large batch of LC78601RE, maybe the last ones. :-)

Regards,
Tibi
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Old 16th August 2012, 06:45 PM   #6207
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Quote:
Originally Posted by Dufus View Post
Can someone confirm if the EZ35 could be used?
Can not be used. See schematic
http://vicol-audio.ro/docs/jvc_rc-ez31bb,rc-ez35rb.pdf

Regards,
Tibi
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Old 17th August 2012, 12:29 AM   #6208
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Quote:
Originally Posted by tvicol View Post
The great news it that we were able to source a large batch of LC78601RE, maybe the last ones. :-)

Regards,
Tibi
Fantastic news. Congratulations!
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Old 17th August 2012, 12:45 AM   #6209
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Tvicol,
THanks and good to hear. I know how much you have put into this and have nothing but the greatest of admiration for your efforts. It shows you have true passion for fine audio.
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Old 17th August 2012, 08:20 AM   #6210
tvicol is offline tvicol  Romania
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Remote schematic attached.
We are working on PCB and hope to offer this as well.
CD puck not yet defined. Im still designing and looking for best looking/performance/value.

Regards,
Tibi
Attached Files
File Type: pdf Sch Shiga remote_16082012.pdf (55.6 KB, 100 views)

Last edited by tvicol; 17th August 2012 at 08:32 AM.
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