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Old 24th August 2008, 03:53 PM   #1851
okapi is offline okapi  United States
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Quote:
Originally posted by Erik van Voorst
Obviously this is not gonna work yet..but the way the motor is mounted in my 2nd "test-set-up" takes me further for new ideas.

...........................brainstorming.......... .

Erik, i really think this idea has a enormous potential. it has convinced me to spend some time figuring out how to get a 2mm shaft mounted on a bearing.
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Old 24th August 2008, 05:23 PM   #1852
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by rikkert1978
About my oscilator problem:

There was a small piece of cut-wire inside the laser compartment... I normaly don`t clean up my workspace, but I will from now on!

I had a spare one, so when putting all the parts on the "new" one, I came across that little wire that was obstructing the laser from moving properly.

Glad thats fixed -although kinda stupid.. -

How do you guys handle your mechanism when modifying?

<snip>

Very carefully... You do know that these are static sensitive? I keep the area I am working in scrupulously clean and use an anti-static strap and grounding system.. I specified a low esd treatment on my bench top when I ordered the bench - although by now it's old enough that I would not count on it. A grounded anti-static mat would be even better.

Foreign objects in or around the laser assembly are bad news, you got very lucky..
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Old 24th August 2008, 10:15 PM   #1853
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Quote:
Originally posted by okapi



Erik, i really think this idea has a enormous potential. it has convinced me to spend some time figuring out how to get a 2mm shaft mounted on a bearing.
Please inform me if you make progression I find that getting the proper ideas is one thing but finding the right materials is an other....


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Old 25th August 2008, 12:10 AM   #1854
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Maybe that picture gives you some ideas

Click the image to open in full size.
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Old 25th August 2008, 08:37 AM   #1855
Zoran is offline Zoran  Serbia
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Hi
I am folowing the thread form the beguining...
extremly interesting
I tryed the transport with no modifications,
and poor, reconnected, self power supply
with a dac inside...
(now I am without the DAC, so I could not try the SPDIF out...)
the transport sounds not bad at all,
even with the inproper audio out components values:
Power supply is common
should be sepparate:
remove R957(220ohm)
and put the 5V analog PS...
C964 and C945=3.3uF should be minimum 10uF
R961 and R960=5.6K that is wrong value, because of most solid state amps or preamps
have 10K input R, parraleling with 5.6K is too low and leeds to bigger value
of min. 47uF which is too high value for find good one, and phase shift C is bigger
leeds to ugly bass... tube equipment, on the oter hand, have higher values of pots and Rin...
in booth casses, R961 and R960 should be higher a 100k min.
probably we have an oversampling in the system internal chip...
So the C948 and C947 are not propper filtering
even in conjunction of about 100pF-150pF added cable capacitance...
I suggest to remove them.
Expetially for those who using tube amps, because the most OT are not capable to transfer the highs beyond the 40KHz
or do the proper one...
R955 and R956 are the good ones they protect internal OP amp from short circuit conn.
*
I tested all that with borrowed, louzy tube amp assembled from 2 old tube radios
my oppinion that bandwitht is 120Hz-12KHz -3db
and old Lowther Acousta deluxe cabinets
which are from approximatly same bandwith...
the amp has high D-factor, and huge phase shift in lower end
so the bass is misty...
But middle is not bad at all
*
I am positive that with the SPDIF would be
as You guys already tryed...
thanks
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Old 25th August 2008, 04:03 PM   #1856
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Here some additional info regarding disc table as posted on 47Labs site: http://sakurasystems.com/articles/pitracermemo.html


3. Platter

The platter is machined out of acrylic. Only the inner clamping area and the outer edge touches the disc. The disc would be clamped down at the center by an acrylic clamper. This makes the disc flattened out except the unevenness of the thickness of the disc itself. You can see the effect of this system by looking at the reflecting image on the rotating disc surface with which you won't be able to tell whether it's moving or not.
The reason I made the platter and the locking clamper by acrylic is to minimize the unnecessary inertia, to eliminate magnetic effect on the actuator coil, and most importantly, after the motor is fixed to the platform and the acrylic platter is pressured in, we can re-machine each platter one by one while it's rotating to ensure the flat plane of the surface. By this method, the aforementioned flickering of an image on the rotating disc is further minimized.
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Old 25th August 2008, 04:30 PM   #1857
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I have got around 3000 cd's......in order to tell if a disc is rotating or not he must have picked the one without flaws......happy searching.........


Anyway yesterday we made again quite a huge leap by getting rid of the SPDIF...

I am able to do that since my Genesis Digital lens has an AT&T Input......

We installed a (Wadia) board with AT&T...gave it a dedicated power supply with the edition of a 5V ALWSR board hooked it up with the Lens.....and were again very pleasantly surprised...

We silently hoped for the same shocking results as the AT&T did with the Wadia (a couple of weeks ago) in an
SPDIF shoot-out and were not disappointed...

The complete Analog sound stayed the same but more body....more resolution...more definition in the lows...(leaving the mids alone !!!)...

A win win situation ....this boards stays in...

The comparison is maybe a bit like driving a Corvette with a small block and modifying it with a big block....
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Old 25th August 2008, 04:41 PM   #1858
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I need a bigger boat....
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Old 25th August 2008, 05:10 PM   #1859
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I have found a couple of different clamps recycled from other units.
The first is from a TEAC computer drive, which I have fitted to a motor with a 22mm shaft .
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Old 25th August 2008, 05:13 PM   #1860
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by Erik van Voorst
I need a bigger boat....

I'd say it's taking on a life of its own..

I'm going to look for a cdrom ball clamp at some point..
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