Tweakers' Asylum

You've got me curious...

64.13.14.96

rick_m

In Reply to: RE: Don't be confused posted by unclestu52 on August 13, 2007 at 20:43:24

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

Follow Ups:

RE: You've got me curious... - unclestu52 10:49:29 08/14/07 (2)
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)
  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)
    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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