How to explain the waking screen rustle?

Hi voltage gets up to a couple of thousand volts, and static electricity causes little snapping arcs on dust on the glass? Hold your arm up near it. All the hairs on your arm point to the glass? Lots of static electricity.

What part of the computer gets such load when I wake up the screen ?

One origin of the arc is dust so what's its destination, the glass?

How does the sudden voltage cause these arcs?

What part of the computer gets such load when I wake up the screen ? ======================================================== I wouldn't use the word load. When you turn on the screen, the high voltage power supply charges up to several thousand volts. You can get a spark from walking across a rug. Read about static electricity.

The CRT high-voltage accelerator anode. (and, as BobG said, "load" isn't the right word here. Maybe, "charged".)

The air. It's like a corona discharge.

It causes the air to ionize, making a conductive path, which drains the charge abruptly.

Hope This Helps! Rich

Many thanks.

I wouldn't like to bother too much with this but, after having listened to my TV carefully, I seem to hear another sound now, apart from the snaps. It's a high tone that follows a kind of bell curve before disappearing (completely?).

Should I link this noise to static electricity too? Could it be related to the cathode-ray tube or something?

That's probably the horizontal deflection oscillator "winding down" (i.e., drifting badly in frequency as the power supply bleeds off).

Cheers! Rich

Some folks can hear the 15.75KHz horizontal frequency, but they probably havent stood infront of a 100 watt guitar amp in a smoky barroom while working their way through college.

Who listens to anything in B&W NTSC TV format? Its been 15,734 Hz for decades.

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The curve > Some folks can hear the 15.75KHz horizontal frequency, but they probably

Right! I don't remember what was the last concert I saw but my ears remind me that it was too loud. However I can hear frequencies till approximately

17Khz (tested with Csound).

I /used/ to be able to hear H oscillators, until I started doing things like that in my late teens. ;)

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Hmm. I'm not heard such low hum from tv... I think that it's rather

15,734 kHz , not Hz :-)

Nope. It's Hz. And it's audible, to those with good hearing. At least, I used to be able to hear it. :-(

Ed

John says: Right! I don't remember what was the last concert I saw but my ears remind me that it was too loud. However I can hear frequencies till approximately

17Khz (tested with Csound). ========================= But how do you estimate how many db down it is at 17khz? Or is that where its so many db down its inaudible?

You may want to thnk about that just a LITTLE bit longer....

(Actually, it's 15,734.26-and-then-some Hz, but now we're just being picky....:-) More precisely, it's 15,750 times 1000/1001. And if you know where that factor came from, the apparent weirdness of the result suddenly is explained...)

Bob M.

you mean 15.734 khz ? the 15,734 Hz is correct btw.

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Most of the responses appear to refer back to the horizontal oscillator coil whine or on when shutting down the monitor.

As I understand the question, you hear a "rustling" sound, kind of like a frying sound when you turn ON the monitor.

If this is what you are hearing, I'll go with high voltage build up on the tube of the CRT causing lots of small sparks off the dust on the tube.

Now the brief hum you hear when you turn on the monitor is the degaussing ring around the face of the tube running for a few seconds.

Correct.

Graham

that depends on what you mean by the ,

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If its not obvious that I'm posting from the US, and what it means you are on your own.

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Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida