Can I pull 24V from a PSU?

[Godfodda]

I've acquired a 24VDC squirrel cage fan that I'd like to tinker with. Is there a splice or something I can make that will give me the voltage I'm looking for? +12 & +12? Or will I need a separate transformer?

Also have a 28VDC fan that I want to play with. This could probably be pulled from a modded 24V line too, right?

[Crazy Jayhawk]

I saw a link where a guy ran two PSU's in series to get 17V. He hooked the 5V from one to the ground of another. If you do that, make sure you do what that guy did and verify that there's no way that the ground of the "victim" PSU comes in contact with the casing or the third wire of the power cord.

If someone could find the link to that, it'd probably be more helpful. :)

[KILLorBE]

You can get 24V from your PSU by using the +12V and -12V.

I suggest you read this article (17V Mod) (http://www.ocmod.com/code/show_art.php?id=28&pg=1).

[Crazy Jayhawk]

Originally posted by KILLorBE
You can get 24V from your PSU by using the +12V and -12V.

I suggest you read this article (17V Mod) (http://www.ocmod.com/code/show_art.php?id=28&pg=1). The minus-voltage lines can't produce high currents. Usually less than an amp.

[Godfodda]

That 0.3A limit might be a bit stifling. We have some DC control boards at work that I may go ahead and use instead. 120VAC in and 0-150VDC out with full control via several onboard pots and one external. Amperage wouldn't be an issue here as we use these to drive many small electric motors at once. Just have to figure out how to get it to switch with the PSU.

[KILLorBE]

Originally posted by Godfodda
Just have to figure out how to get it to switch with the PSU.

That's easy, all you need is a relay(12V), some wires(thick enough for the PSU you want to use), a voltmeter/multi-meter and a "experimental" PCB (I don't know how you call it, but its a board with small (~2x2mm or ~1/10 inch) square dots and holes) and some "stand offs"(for the PCB).

I think I can guide you thru this (online) it might not be easy (for me :D ) but I can give it a shot, I'll make sure you wont get electrocuted :) , all you need to do is: read my s#!t and tell me what you've done. (pics would be nice/better....easier for me to guide you thru this).

Actually its the same as the dual psu mod (http://www.hardwareoc.com/dualpsu.php) the only difference is that you work with higher voltage.....so I don't think you'll need my guidance.

[Godfodda]

Originally posted by KILLorBE


That's easy, all you need is a relay(12V), some wires(thick enough for the PSU you want to use), a voltmeter/multi-meter and a "experimental" PCB (I don't know how you call it, but its a board with small (~2x2mm or ~1/10 inch) square dots and holes) and some "stand offs"(for the PCB).

I think I can guide you thru this (online) it might not be easy (for me :D ) but I can give it a shot, I'll make sure you wont get electrocuted :) , all you need to do is: read my s#!t and tell me what you've done. (pics would be nice/better....easier for me to guide you thru this).

Actually its the same as the dual psu mod (http://www.hardwareoc.com/dualpsu.php) the only difference is that you work with higher voltage.....so I don't think you'll need my guidance.

I remember reading that article. So instead of the second PSU, I'll be controlling the relay coil, right? And passing 120VAC through the contacts to the DC controller. Seems simple enough... if I understand right. Oh, and should I pull my AC from the PSU itself or externally? External would be easy because of all the outlets I have near my desk, but internal would require one less cord. The AC input line is fused, btw (and the DC out, too).

This has me thinking of running all my case fans from this controller. I wonder what happens to 120s that run above 12V. I think I have something to play with at work this week. :D

[Crazy Jayhawk]

http://www.procooling.com/articles/html/linking_multiple_psu_s_as_one_.shtml

I think this was the article I was looking for.

[Loud]

Originally posted by Godfodda


I remember reading that article. So instead of the second PSU, I'll be controlling the relay coil, right? And passing 120VAC through the contacts to the DC controller. Seems simple enough... if I understand right. Oh, and should I pull my AC from the PSU itself or externally? External would be easy because of all the outlets I have near my desk, but internal would require one less cord. The AC input line is fused, btw (and the DC out, too).

This has me thinking of running all my case fans from this controller. I wonder what happens to 120s that run above 12V. I think I have something to play with at work this week. :D


The suspense is KILLING me!! :eek: Did you get this to work?

Modding addicts want to KNOW! :D