Tweakers' Asylum

RE: Freezing CDs/DVDs

209.34.239.254

cdc

In Reply to: RE: Freezing CDs/DVDs posted by unclestu52 on August 13, 2007 at 13:38:20

I have not tried freezing a CD yet, but I am sure I will sooner or later (I am a tweak-a-holic)...lol

In your post you mentioned, "placing a large ferrite over the spin motor and hearing a noticeable increase in detail". This intrigues me. I am assuming this would work on a CD or DVD transport also right? When you say "large ferrite" are you referring to a cable ferrite clamp type of ferrite? Thanks and I look forward to hearing back from you.

Best Regards,

Chris

Follow Ups:

No, not really - unclestu52 17:48:29 08/13/07 (7)
I found a surplus bunch of unmagnetized speaker magnets, roughly
a one inch i.d. and a 3 inch o.d. You could use large steel washers or a dumb bell weight also (if it's iron), centering it over the spin motor. Some have claimed that it is the weight dampening the chassis, but it also works under the chassis, too.

And yes, it works on both CD and DVD transports.

Stu
- Ok, now I am confused... - cdc 18:56:28 08/13/07 (6)
  What is the purpose of the tweak? Is it the magnetism of the metal (steel washers, dumbell, etc) that is interacting with the spin motor that is improving the drive's performance or?
  
  Thanks,
  
  Chris
  - Don't be confused - unclestu52 20:43:24 08/13/07 (5)
    magnetism would prefer to travel through any ferrous object: ferrites, steel washers, etc. In doing so, those objects will absorb the magnetic field produced by the motor's operation and thereby shrink the size of that field.
    
    A VPI 'Magic Brick" is not ideal for this purpose because the field generated by a motor is toroidal in shape (donut shaped). You need that hole in the middle to allow the magnetism to drop through in order to complete the magnetic path.
    
    I believe a reduction in the size of the EMF field has a direct correlation to a reduction in its effects on nearby circuits, including the laser readout heads.
    
    Stu
    - RE: Don't be confused - cdc 12:23:07 08/14/07 (0)
      Ok, next week when my system settles in from all the power and speaker tweaks I have recently done, I will experiment with placing ferrites, steel washers, etc. above the spin motor of the Transport. I just purchased a strong table top degausser, will try demagnetizing the steel first also and see what happens.
      
      Thanks for the info!
      
      Chris
    - You've got me curious... - rick_m 08:35:59 08/14/07 (3)
      I just had one of those moments where I caught a glimpse of the depth of my ignorance. Not good, need more coffee. What sort of motors do CD players use? Yes, I've seen them and they be metal and electric, but upon what principle do they operate? Are they steppers, synchronous etc. I know virtually nothing about electrical machinery and thought it was good that I didn't have to take the class, now I'm not so sure. I know they constantly change their speed to keep the mean data rate constant so I suppose they could even be DC motors relying on the feedback loop.
      
      Dispel the darkness oh master tweaker...
      
      Rick
      - RE: You've got me curious... - unclestu52 10:49:29 08/14/07 (2)
        
        In Reply to: RE: You've got me curious... posted by rick_m on August 14, 2007 at 08:35:59
        
        Hey! I ain't no master tweaker, let's get that fact clear. I have, ah, more than few dead chassis'lying about as proof of experiments gone awry, and evidence of foolhardy experimentation (if you can politely call it that!).
        
        The motors are DC motors, though. Typically, at the most, three pole versions, although on the older and more expensive transports I have seen four pole motors. I haven't really traced the circuit and the IC's used but I do believe it is as you surmise, a servo feedback system. Of course, I haven't ripped apart any of those extremely pricey players.
        
        Stu
        
        Thanks for the info Stu. - rick_m 11:16:30 08/14/07 (1)
        
        In Reply to: RE: You've got me curious... posted by unclestu52 on August 14, 2007 at 10:49:29
        
        I'm sorry to inform you that having dead carcasses lying about from failed tweaks, and yet tweaking onward is a certain sign of a master tweaker. Other diagnostic tendencies have also been noted. There is no escaping it...
        
        Rick
        
        Hey! - unclestu52 11:27:39 08/14/07 (0)
        
        In Reply to: RE: Thanks for the info Stu. posted by rick_m on August 14, 2007 at 11:16:30
        
        a tweaker, maybe, but certainly not a master of tweaking! More like a paranoid one, if anything.
        
        Thanks, anyway, though...
        
        8^)
        
        Stu

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