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

post #1 of 51
1/2/12 at 8:05pm
Thread Starter 
i'd like to control the positive line with speedfan, +0 to +12V. so i could use the -12V line but that's bad because the minimum speed would be too loud. is there any way of making a -5 or -7V line? or should i give up on this idea?
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post #2 of 51
1/2/12 at 8:09pm
  • redsunx
  • Gamestop: We don't have a PC copy of ME3
What? 12+5 = 17... You gotta over volt fans by connecting to the molex connectors. So to the red and to the yellow and ground that sucker. Shazam, you got a spinning hamster killer! thumb.gif

124


You can also use 9v batteries, or 24v on the molex. Either way it's gonna be loud and blow you off your chair.
Edited by redsunx - 1/2/12 at 8:20pm
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post #3 of 51
1/2/12 at 8:26pm
Quote:
Originally Posted by redsunx View Post

What? 12+5 = 17... You gotta over volt fans by connecting to the molex connectors. So to the red and to the yellow and ground that sucker. Shazam, you got a spinning hamster killer! thumb.gif
124
You can also use 9v batteries, or 24v on the molex. Either way it's gonna be loud and blow you off your chair.

DO NOT DO THIS. The 12V rail will try to source an infinite amount of current into the 5V rail and your PSU (should) shut down due to too much current draw.

For 17V, use an external PSU or a boost converter.
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post #4 of 51
1/2/12 at 8:27pm
  • redsunx
  • Gamestop: We don't have a PC copy of ME3
Quote:
Originally Posted by ARandomOWl View Post

DO NOT DO THIS. The 12V rail will try to source an infinite amount of current into the 5V rail and your PSU (should) shut down due to too much current draw.
For 17V, use an external PSU or a boost converter.

What? 2002 was ten years ago. I've been doing this for years. It's pretty hard to send a current into a current that's headed in the opposite direction. hence the whole ground thing...
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post #5 of 51
1/2/12 at 8:32pm
Quote:
Originally Posted by redsunx View Post

What? 2002 was ten years ago. I've been doing this for years. It's pretty hard to send a current into a current that's headed in the opposite direction. hence the whole ground thing...

Current travels from a higher potential to a lower potential.

Either learn to electronics before trying to teach, or quit trolling.
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post #6 of 51
1/2/12 at 8:48pm
  • redsunx
  • Gamestop: We don't have a PC copy of ME3
Quote:
Originally Posted by ARandomOWl View Post

Current travels from a higher potential to a lower potential.
Either learn to electronics before trying to teach, or quit trolling.

You mean, the ground? I just said, I've been doing this for years. So has the guy that's taught me everything I know about computers. It's safe to not have OCD and anxiety about your computer, it's very well OK to ghetto rig stuff and treat it like garbage. Computers aren't made out of ceramic. The only place the fan is sending a current to is the ground, other than that it's pulling a total of 17 volts from one connection, <---wordage, PULLING. It doesn't loop back out. It's pulling and disposing.
Edited by redsunx - 1/2/12 at 8:50pm
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post #7 of 51
1/2/12 at 8:53pm
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But wont the 17 volts kill the fan?
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post #8 of 51
1/2/12 at 8:54pm
You clearly have little knowledge of electronics. I have no idea how you haven't fried anything. You can't add voltages together like that. That's not how electronics works.
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post #9 of 51
1/2/12 at 8:57pm
  • redsunx
  • Gamestop: We don't have a PC copy of ME3
Quote:
Originally Posted by nvidiaftw12 View Post

But wont the 17 volts kill the fan?

Fairly quick yes lol.
Quote:
You clearly have little knowledge of electronics. I have no idea how you haven't fried anything. You can't add voltages together like that. That's not how electronics works.

But you can. I have been doing it for. Years. If what your saying is true, then adding a second PSU would have the same result. Or if you were to add a 9v battery, that would sizzle/explode. Get some hair on your chest and try it. If you choose to live your life by a book, you will never write your own book. Clockwork is pretty simple to understand. AKA computers.
Edited by redsunx - 1/2/12 at 9:00pm
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post #10 of 51
1/2/12 at 8:58pm
Quote:
Originally Posted by redsunx View Post

What? 12+5 = 17... You gotta over volt fans by connecting to the molex connectors. So to the red and to the yellow and ground that sucker. Shazam, you got a spinning hamster killer! thumb.gif

124


You can also use 9v batteries, or 24v on the molex. Either way it's gonna be loud and blow you off your chair.
Dude, no. You are paralleling the voltages, and parallel voltages don't add. Like arandomowl is saying, the 12V line will source a ton of current into the 5V line.
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