Electronics > Beginners
Linking PC PSUs for a dual rig build.
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Crysis1982:

--- Quote from: wraper on April 30, 2018, 01:10:21 am ---Just use 2 Schottky diodes (or dual diode) at positive power rail. Thus it will be powered from whatever has higher voltage. GND is common through the case but you could put a wire for lower resistance. And WTF you would need a third PSU? Consumption is way too low to justify it.

--- End quote ---

I don't have enough peripheral ports in the back of the PSU to run everything as I would need 1.3m cables to power everything together.

And I can't do it using the two PSUs as this would mean both systems would be on all the time.
paulca:
If the cooling fails the CPU will slowly overheat, throttle and eventually HALT before damage occurs.  Just like they do when your air cooler gets clogged in dust.  (If you PC locks up under heavy load occasionally, this is often the cause, that or inadequate cooling).

The only remote chance of cooking the CPU is if the heatsink/block comes off then the die can exceed it's failure temp before the diode temp sensor can detect the overtemp and halt the CPU.

They are surprisingly hard to kill.
wraper:

--- Quote from: Crysis1982 on April 30, 2018, 04:28:45 am ---
--- Quote from: wraper on April 30, 2018, 01:10:21 am ---Just use 2 Schottky diodes (or dual diode) at positive power rail. Thus it will be powered from whatever has higher voltage. GND is common through the case but you could put a wire for lower resistance. And WTF you would need a third PSU? Consumption is way too low to justify it.

--- End quote ---

I don't have enough peripheral ports in the back of the PSU to run everything as I would need 1.3m cables to power everything together.

And I can't do it using the two PSUs as this would mean both systems would be on all the time.

--- End quote ---
:palm:, and you don't need both of them running.
I did not say before but you certainly have more money than sense.
Crysis1982:

--- Quote from: wraper on April 30, 2018, 08:55:28 am ---
--- Quote from: Crysis1982 on April 30, 2018, 04:28:45 am ---
--- Quote from: wraper on April 30, 2018, 01:10:21 am ---Just use 2 Schottky diodes (or dual diode) at positive power rail. Thus it will be powered from whatever has higher voltage. GND is common through the case but you could put a wire for lower resistance. And WTF you would need a third PSU? Consumption is way too low to justify it.

--- End quote ---

I don't have enough peripheral ports in the back of the PSU to run everything as I would need 1.3m cables to power everything together.

And I can't do it using the two PSUs as this would mean both systems would be on all the time.

--- End quote ---
:palm:, and you don't need both of them running.
I did not say before but you certainly have more money than sense.

--- End quote ---

It is not that. I don't have enough peripheral ports to run the cooling and the system due to the distance between each item. How do i make a 70cm cable go to the bottom of the case and then make its way up to the top of a 1m case.

I am not doing it becase I dont think the power suply can take it, I just dont want to fork out for custom cables that are over a meter long with connections at predetermined lenghts.
wraper:
If you use 3rd PSU, you still will need to make a custom cables with simple circuit. You said you will use fan/pump controller. It means you should need only very little cabling to power it from both PSUs, the rest should be powered from controller. Just use 2 molex extension cables if there is not enough length, put diodes on 12V rails and connect to power of the fan controller. Connect GND wires together and attach to the fan controller as well.
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