Finally, an affordable CD Transport: the Shigaclone story - Page 451 - diyAudio
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Old 21st March 2011, 09:46 PM   #4501
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Quote:
"Take the mechanism off the bottom controller board"
Separate the controller board from the upper plate that holds the motors and laser sled. That way there are fewer vibrations reaching the electronics.

Quote:
"Remove output resistors and use RF attenuators instead"
I use RF attenuators to drop the signal from TTL to consumer. They kill reflections in the cabling which can cause mistiming of the spdif signal - jitter. In every case where I've used them so far, the sound has improved, cleaner bass and treble.

See my original post here:
RF attenuators

Fran
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Old 21st March 2011, 10:05 PM   #4502
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Quote:
Originally Posted by le´flu View Post
Hi Peter,
would you be so kind and shortly give an abstract of your latest recommen-
ded modifications?
I presented a simple approach here: The CD Transport This is still most rewarding solution when you consider time and parts vs results. I use one of those transports in my system and can't complain at all. This is also the essence of Shigaclone transport: pushing the envelope of simplicity

You can improve further by adding dedicated 5V regulator, adding more transformers to PS, more caps, changing some other caps etc. My recent experiences have been described here:

Finally, an affordable CD Transport: the Shigaclone story

Finally, an affordable CD Transport: the Shigaclone story
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Old 22nd March 2011, 07:58 PM   #4503
woood09 is offline woood09  Netherlands
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hello all,
first, Peter Daniel, thank you very much for starting this thread. I have fun a lot.

In this trhead on page 128, #1273, Slawney make a few statements, he wrote " One word of caution to those pursuing a
multiple reg approach, however, the timing of the start up of different regs must be properly adjusted to avoid latch up because of an absent clock signal or such. Sympton will be no toc or a servo spinning out of control upon start up."

So, is there anybody that can explain whats this mean, and how to solve this problem?

Woood09
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Old 22nd March 2011, 08:30 PM   #4504
woood09 is offline woood09  Netherlands
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Hello all
Peter Daniel, thank you very much for starting this thread.

On page 128 of this thread, #1273, Slawney make this statemend,
"One word of caution to those pursuing a multiple reg approach,
however the timing of the start up of different regs must be properly adjusted to avoid latch up because of an absent clock
signal or such. Sympton will be no toc or a servo spinning out
of control upon start up."

Is there anybody that can explain this statement, and can solve
this problem?

Woood09
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Old 23rd March 2011, 04:57 AM   #4505
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Latch-up in a chip basically means that it "freezes" in a certain state, waiting for a signal input that never came.
If all the chips do not receive the +5V AT THE SAME TIME, some chips could be on and end up waiting/freezing for an input while others are still turning on.
This could permanently damage the transport.

And the solution is simple: Feed the chips off the same 5V reg.
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Old 23rd March 2011, 04:13 PM   #4506
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Sorry for my ignorance, but how could this cause permanent damage?
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Old 23rd March 2011, 06:40 PM   #4507
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Latchup - Wikipedia, the free encyclopedia
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Old 23rd March 2011, 07:23 PM   #4508
hotiron is offline hotiron  Scotland
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This looks familiar.
SANYO OPTICAL LASER LENS SF-P101N (16 PIN) W/MECHANISM on eBay (end time 31-Mar-11 19:03:36 BST)
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Old 23rd March 2011, 07:28 PM   #4509
hotiron is offline hotiron  Scotland
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Quote:
Originally Posted by woood09 View Post
Hello all
Peter Daniel, thank you very much for starting this thread.

On page 128 of this thread, #1273, Slawney make this statemend,
"One word of caution to those pursuing a multiple reg approach,
however the timing of the start up of different regs must be properly adjusted to avoid latch up because of an absent clock
signal or such. Sympton will be no toc or a servo spinning out
of control upon start up."

Is there anybody that can explain this statement, and can solve
this problem?

Woood09
I am pretty sure that pushing the tray switch resets the chip and forces it to read the TOC
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Old 23rd March 2011, 08:02 PM   #4510
hotiron is offline hotiron  Scotland
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Default Cable too!!!

Same guy also has extra long film cable.

FLEXIBLE CONNECTION FLAT CABLE 15P FOR SF-P101N (15PIN) on eBay (end time 21-Apr-11 01:00:01 BST)
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