Psu Weird noise

[maxx2575]

you should just get a new psu, then set this psu up so that it's on a live stream.

 

[LabRat 891]

I uploaded the vid as an unlisted YouTube video to send here it is

My power supply wants to kill me.

My PSU makes this sound but only in the middle of the night for some reason even when unplugged.

youtube.com

Whatever frequency it is, it definitely triggers a pretty basal feeling of dread/concern.
I hope I'm safe in assuming it's artificial, but it sounds like the guttural noise of a med-large predatory mammal.

On the EMI angle: Do you have an old AM radio handy? I often can manually 'sweep' the AM band and 'hear' things like radiated emissions from A/C compressors and cheap LED bulbs.

Kinda edging into crazytown, but... Do you have any frenemies or mischievous friends w/ extensive electronics/radio knowledge? This seems like it could potentially be a '(inverse)phreaking prank'
I have to admit, if I knew how to make electronics sound possessed at a distance, I might do just that.

Another (even more remote) possibility: Infrasound, attenuated into the audible range by reverberating in the case's construction.
It's a longshot, but I suppose your room could be a 'node' for infrasound from Wind Turbines (or something) nearby. Doesn't much explain why it's only at night though. I can imagine a reason, but it pushes things even further away from "realistic probability'

Does it make the same sound anywhere you put the computer? Like, say the bathroom?
(Bathrooms often have unique acoustics vs. the rest of ones' living space.)

you should just get a new psu, then set this psu up so that it's on a live stream.

If it is caused by an external force (and not literally a possessed/cursed piece of technology) I'd bet it'll stop once removed from the case. I can hear the metal of his case reverberating in addition to le spooky noise. The case sounds like it's part of what's generating the sound.

 

[Solaris17]

man, this sounds like transformer hum.

 

[Bill_Bright]

man, this sounds like transformer hum.

Of course it is impossible to tell from here but it sounds to me like it is being amplified which would suggest the sound is coming out of speakers.

In any case, transformer hum is caused by current flowing through the transformer. That current would cease when the PSU is unplugged from the wall and the OP said the noise still happens when unplugged!
Even "IF" the current is being supplied after being unplugged by a faulty filter capacitor (or faulty bleeder circuit for those caps) the act of producing that buzz would consume that stored voltage and quickly discharge those caps. So again, the buzz would not continue hour after hour.

One thing that is abundantly clear to me is that we do not have all the information.

 

[Solaris17]

Of course it is impossible to tell from here but it sounds to me like it is being amplified which would suggest the sound is coming out of speakers.

In any case, transformer hum is caused by current flowing through the transformer. That current would cease when the PSU is unplugged from the wall and the OP said the noise still happens when unplugged!
Even "IF" the current is being supplied after being unplugged by a faulty filter capacitor (or faulty bleeder circuit for those caps) the act of producing that buzz would consume that stored voltage and quickly discharge those caps. So again, the buzz would not continue hour after hour.

One thing that is abundantly clear to me is that we do not have all the information.

Yeah no shit Bill.

anyway OP since ghosts aren’t real I would try swapping PSUs or seeing if it does it in another room or maybe at a shop.

 

[LabRat 891]

Oh, I had an idea while I was failing to get to sleep.

Does your home or a next door neighbor have a recently installed EV charger? Not only are those high-current, an improperly installed charger or malfunctioning charger in the EV could be rather noisy.

I am also wondering if it could be a cap that's not discharging, and/or a MOSFET allowing inducted external emissions to partially energize a coil.

 

[Lei]

I would like to see this psu through a FLIR (Forward Looking Infrared) camera.

I am also wondering if it could be a cap that's not discharging, and/or a MOSFET allowing inducted external emissions to partially energize a coil.

the current is being supplied after being unplugged by a faulty filter capacitor.

 

[Wirko]

Does your home or a next door neighbor have a recently installed EV charger? Not only are those high-current, an improperly installed charger or malfunctioning charger in the EV could be rather noisy.

Another potential clue: if a charger or some other large consumer is to blame, it might be programmed to switch on when electricity is at a lower rate.

 

[Shrek]

could be a cap making noise as it discharges, i fixed a cap in a amp years ago which would make popping sounds when turned off some times hours later.

I learn something new every day.