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Early_To_Risa@sh.itjust.works

Anon reflects on e-sports (sh.itjust.works)

submitted 4 months ago by Early_To_Risa@sh.itjust.works to c/greentext@sh.itjust.works

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[–] RightHandOfIkaros@lemmy.world 0 points 4 months ago* (last edited 4 months ago) (1 children)

https://en.m.wikipedia.org/wiki/Flyback_transformer

Under "Operation and Usage":

In television sets, this high frequency is about 15 kilohertz (15.625 kHz for PAL, 15.734 kHz for NTSC), and vibrations from the transformer core caused by magnetostriction can often be heard as a high-pitched whine. In CRT-based computer displays, the frequency can vary over a wide range, from about 30 kHz to 150 kHz.

If you are hearing the sound, its either a TV or a very low quality monitor. Human hearing in perfect lab conditions can only go up to about 28kHz, and anything higher is not able to be heard by the human ear.

Either that or you're a mutant with super ears and the US military will definitely be looking for you to experiment on.

[–] errer@lemmy.world 0 points 4 months ago (1 children)

I’ll defend this guy: there can easily be a harmonic at half the flyback frequency that is audible. It’s lower amplitude so less loud, but I could believe someone being able to hear that.

[–] RightHandOfIkaros@lemmy.world 1 points 4 months ago* (last edited 4 months ago) (1 children)

Yes, as I previously stated, if there is a problem with the flyback transformer circuit, it is possible that the frequency or volume of the noise it generates can become increased or different.

Though again, PC monitors never made an audible noise unless they were low quality and used the cheaper 15.7kHz transformer in their construction.

Other noises associated with CRTs are the degaussing noise, which only happens once usually after turning on the CRT or after pressing the degauss button, or the sound of old IDE hard disks spinning, which also make a constant high frequency noise.

[–] errer@lemmy.world 0 points 4 months ago* (last edited 4 months ago) (1 children)

Not sure you follow: even if the primary frequency is out of range, a harmonic (half the frequency, quarter the frequency, etc) can simultaneously exist with the primary.

[–] RightHandOfIkaros@lemmy.world 0 points 4 months ago (1 children)

I suppose its possible with a low quality CRT that has poor construction, leaving loose parts or thin plastic fins that can vibrate at harmonics of a lower frequency, but high quality CRTs don't have this issue.

Extra or louder noise does not occur in normal operation of a correctly functioning flyback transformer circuit. Any frequency or harmonic (vibration) that occurs that is not the specified frequency of operation of the flyback transformer is caused by a problem in the circuit. A brand new CRT with known good parts will not have any kind of extra harmonic.

I had to replace a flyback transformer because it was too loud, and it was a pretty simple job. Hardest part was finding a new flyback transformer. After replacement, the noise volume was reduced to normal levels.

[–] tritonium@midwest.social 0 points 4 months ago* (last edited 4 months ago)

It's crazy you keep ignoring what he's saying to double down and triple down on your incorrect claim.