Yep.

Is this sufficient?
https://a.co/d/5riW02Y

 

That looks fine.

But, forgive me if this was already answered, I didn’t find it by a quick scan of the thread, why not run the fan always from the server? Why is it important for the PC to control the fan when it is running?

 

That looks fine.

But, forgive me if this was already answered, I didn’t find it by a quick scan of the thread, why not run the fan always from the server? Why is it important for the PC to control the fan when it is running?

I would connect them only to the server but when the pc is on, he is the hottest part and it needs more airflow than the server. I can just increase the fan curve, but that is also a problem because I want the fans as quite as possible while only the server is on.

 

If I'd go with a relay which one should I go with and how am I supposed to connect them?

Something like this.



Edit:
Considering if the +5Vin is not a logical input, so, I added a 10K to pull down the Vin to Low when the input switch is OFF to keep Q1 Off, not in a floating state.

 

Something like this.

View attachment 272495

Why do I need a diode in parallel to the coil?

 

Why do I need a diode in parallel to the coil?

Emf of the diode.