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no -5V rail on my power supply, how to do 17V fan mod? - Page 4

post #31 of 51
Quote:
Originally Posted by just_nuke_em View Post

In the sense of keeping with the OP:
Quote:
no -5V rail on my power supply
thumb.gif

True. But it's still possible.

To the poster above you. +12V and -12V have a difference of 24V smile.gif
    
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post #32 of 51
Thats what I was thinking, just totally forgot about my 24v 120mm fan in storage (from a projector) until I saw this thread. XD

Thanks for the info, I probably wouldnt have put it to the test w/o asking anyway. Dont have any junk power supplies to test with atm, as they have all be re-purposed for a ~50a 12v power source for stereo equipment..
Edited by KarathKasun - 1/3/12 at 1:11am
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post #33 of 51
I never said it wasn't possible. It just isn't on our modern psu's whose +5v and +12v rails share the same ground point. If you where originaly talking about a -5V rail, then our arguement was pointless, but from your original post (as shown in duckie's quote, as I can see you've changed yours rolleyes.gif) I was under the impresison you where not talking about -5V rails. wink.gif
    
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post #34 of 51
Quote:
Originally Posted by just_nuke_em View Post

I never said it wasn't possible. It just isn't on our modern psu's whose +5v and +12v rails share the same ground point. If you where originaly talking about a -5V rail, then our arguement was pointless, but from your original post (as shown in duckie's quote, as I can see you've changed yours rolleyes.gif) I was under the impresison you where not talking about -5V rails. wink.gif

Yes. I changed mine due to the fact that I put a 1 in the wrong place. wink.gif Nothing more than a typo.
    
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post #35 of 51
My apologies then redface.gif, we are all on the same page then smile.gif
    
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post #36 of 51
Borat-VeryNice.jpg
    
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post #37 of 51
Thread Starter 
Quote:
Originally Posted by just_nuke_em View Post

I never said it wasn't possible. It just isn't on our modern psu's whose +5v and +12v rails share the same ground point. If you where originaly talking about a -5V rail, then our arguement was pointless, but from your original post (as shown in duckie's quote, as I can see you've changed yours rolleyes.gif) I was under the impresison you where not talking about -5V rails. wink.gif
Quote:
Originally Posted by killabytes View Post

Completely incorrect.
Voltage is nothing but a difference, that's it. If you have 12V and 5V and you do have 7V. Same if you had 12V and -5V, you'd have17V.
Source: My degree in EE. wink.gif
Edit: Thanks duckie, me place numbers in wrong place frown.gif

you should have got your degree in damage control son
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post #38 of 51
Quote:
Originally Posted by ihatelolcats View Post

you should have got your degree in damage control son

thinking.gif
    
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post #39 of 51
Quote:
Originally Posted by KarathKasun View Post

Wait, if running +12 (to positive) and -12 (to negative) should that run a fan rated for 24v? Am I understanding that correctly?

Yes it's possible. I've done 17v and 24v to a number of fans for varying lengths of time. Most low CFM fans can handle 24v for weeks, or 17v for months. Most high CFM fans die quickly. 12v Delta's do not like 24v.
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post #40 of 51
Damn this reminds me the two last years of my existence mad.gif

I had diagrams with 6 different sources plus capacitors guhhh
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