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Old 9th August 2008, 11:13 AM   #1691
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Quote:
Originally posted by Peter Daniel


There is some wobbling and you can notice it by the amount of movement the laser lense does. However, I think it's still rasonably small.

Same thing here Peter
I tried it for a few days and have now gone back to the original..
That extra movement the laser has to do and the challenge of changing discs rules out any benefits IMHO.
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Old 9th August 2008, 01:08 PM   #1692
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Quote:
Originally posted by dantwomey

Click the image to open in full size.

I've been looking at this and have some questions.

First we can see where L901 is removed to supply our 8vdc. To supply a separate 5v we have to remove Q902 and supply +5vdc to the opening left by the collector or to the + side of C916.

The negative sides of the +8 and +5 supplies would have to be reference (tied) together and be powered up at the same time?

I was wondering if we could tap into Peter's original supply just after the diodes and regulate down to a +5v supply from there?

Click the image to open in full size.

Regards,
Dan
I have some ALWSR regulators but as an alternative I'm going to try something along the lines of a TL431 circuit for the 5v portion of this circuit. Or, other circuits I've been looking at is the one's discussed in Pedja Rogic's Gainclone power supplies.

Regards,
Dan
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Old 9th August 2008, 01:23 PM   #1693
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Yes, it's not a problem to connect another 5V regulator right after diodes.
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Old 9th August 2008, 01:24 PM   #1694
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Quote:
Originally posted by audio1st
That extra movement the laser has to do and the challenge of changing discs rules out any benefits IMHO.
Some additional comments about clamping can be found here: http://www.diyaudio.com/forums/showt...22#post1330555
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Old 9th August 2008, 02:26 PM   #1695
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Okay Peter you have persuaded me to continue with it.
I mounted it on a 2mm drill and used a piece of stainless steel to shave the table surface and the puck. It has worked. The material seems to work very easily.
I had given up on it and had nothing to lose and am not telling anyone else to do the same..
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Old 9th August 2008, 02:27 PM   #1696
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And I used a split pin filed to 1mm thickness as a spacer.
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Old 9th August 2008, 04:22 PM   #1697
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Hello audio1st glad to read that you tried it one step further and succeded...still a bit sloppy that the platform does not arrive at our doorstep that way....

Did you notice the same changes as Peter did in his set-up.....
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Old 9th August 2008, 06:13 PM   #1698
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Quote:
Originally posted by audio1st
and the challenge of changing discs...
Changing discs is realatively easy, providing the thread on a puck is loose. Originally it's not, and I run M6x1 tap many times through to loosen threads. When this is done, all it takes when mounting a disc is to hold it with one hand, lightly pressing against the table, while spinning the puck with other hand; it should basically go by itself and when facing resistance the puck should lock onto a disc. Same for removing.

I noticed that the thread in my set was a bit misaligned and the puck was making contact sideway first, only when tightening excessively the gap was disappearing. That could be a reason for some wobble also; loosening the thread should help here as well.
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Old 9th August 2008, 07:37 PM   #1699
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Up and running and I'm sure it is sounding better (could be the upward firing ultraviolet LED). Well you have to make the most of the translucent table
Seriously though it is sounding good at the moment..
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Old 9th August 2008, 07:39 PM   #1700
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At least I know where to put the CD in the dark.....
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