PC fan connected to wall adapter causing lights to flicker

Thread Starter

s355

Joined Apr 13, 2021
23
I am plugging a 12v CPU fan into a 12v power adapter, but starting the fan is flickering the lights. How should I fix this?
 

Thread Starter

s355

Joined Apr 13, 2021
23
It depends on what lights are flickering.

If it's house lights, unplug the thing and call an electrician.
It's only flickering the house lights while starting. While running, the lights don't flicker.
 

Reloadron

Joined Jan 15, 2015
5,916
Just like your last thread. OK, the fan is 12 volts 300 mA according to your last thread. So what exactly is the power supply? Even if the fan overloaded a small 12 volt supply I really can't see how it would make lights powered off mains power flicker. Try placing a large cap across the DC supply like 470 uF 25 volt rated. What id your mains voltage?

Ron
 

dl324

Joined Mar 30, 2015
12,790
It's only flickering the house lights while starting. While running, the lights don't flicker.
If something drawing a few 10's of mA can cause your house lights to flicker, you have a serious problem with your house wiring. Since you're asking very basic questions, you aren't qualified to troubleshoot the problem.

Call an electrician before your house burns down.
 
This is indeed a puzzle. So my first suggestion is to plug another load into that same outlet and see if switching that on also makes the house lights flicker. If it does, then it is some sort of serious house wiring issue. But the first diagnostic act will be to tap the outlet, rather gently, and see if that also makes the lights flicker.
One other thing, a question: Are those flickering lights LED lights fed by a dimmer? My experience is that some dimmer-controlled LED lights flicker from any noise on the AC mains. If that is the case there is no issue.
 
That symptom seems like a bad connection in the outlet box sort of fault, A loose connection or a cracked conductor in the outlet. Quite a simple repair projet, but please switch off the power to the outlet before getting into it.
 
Last edited:

Reloadron

Joined Jan 15, 2015
5,916
@Yaakov Just the lights in the room where the fan is connected.
Then start looking for a poor wiring configuration. Something is loose somewhere. A simple light load should not create a flickering light(s) issue. Now if you have no understanding of branch circuits or how things work I suggest you find a competent qualified electrician to review the problem.

Ron
 
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