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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Re: A couple of questions for all you CD demagnetists out there. posted by geoffkait on September 6, 2002 at 04:12:40:
That is quite an interesting experiment...Well, it wasn't quite the most sensitive experiment that could be performed. A good static meter would have been preferable, but this isn't of such importance that it's worth spending several hundred dollars on one. :)
...I would not have thought that would be the outcome, very puzzling...now, it is possible that the CD charges and discharges during play, but I would have thought there would be at least some charge on the CD when it is pulled out of the tray...
Well, not discharge per se. Discharge implies a near instantaneous equalization of charge, such as the spark when you touch a metal doorknob after walking across a nylon carpet.
Positive ions and water vapor in the air would both work against the building up of charge on the disc from friction with the air. That's why you have more static problems on those dry windy days. Depending on conditions, any static charge may be equalized the moment its created so you're never able to actually build up any sort of charge to begin with.
I'll try to remember to run this little experiment again next time we have a really dry windy day.
As to lifting the CD off the tray, such a separation could produce some charge, but the materials typically used for such trays (ABS plastic) are in pretty close proximity to polycarbonate in the triboelectric series which would result in a very low work function to begin with. Which means that they wouldn't be very effective at separating charges from each other.
Also I'm not sure just where ABS is in relation to polycarbonate. If it's below it, it would tend to pull electrons from the polycarbonate upon separation thereby diminishing any charge that may be on it.
By the way, the CD player I used was just my little JVC "executive" system which is a top loader so the disc never sits on any large flat surface as it does in a tray loader. Just the small center hub and and a puck on the top.
Also, I hope I made it clear in my previous post that I wasn't implying that just because there wasn't sufficient charge to pick up any paper crumbs that there was absolutely NO charge on the disc at all.
perhaps it is possible that, altho though there's not enough of a charge on the CD to attract the paper bits, there is sufficient charge to affect the optical system.
I'm at a loss to explain why it would effect the optical system even if there were enough charge to pick up some paper crumbs.
Still, you make a good case for the non-demagnetizers...
Actually I'm not trying to make any particular case at all. It's others who are making the various cases. I'm just pointing out that the cases made so far have a bit of trouble standing up to scrutiny. That still leaves the issue very much open-ended.
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Follow Ups
- Re: A couple of questions for all you CD demagnetists out there. - Steve Eddy 09/6/0211:10:40 09/6/02 (2)
- Re: A couple of questions for all you CD demagnetists out there. - geoffkait 16:10:31 09/6/02 (1)
- Re: A couple of questions for all you CD demagnetists out there. - Steve Eddy 00:11:06 09/7/02 (0)
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