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no -5V rail on my power supply, how to do 17V fan mod? - Page 2

post #11 of 51
1/2/12 at 9:09pm
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someone try this with the 5000rpm ultra kazes.
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post #12 of 51
1/2/12 at 9:09pm
Quote:
Originally Posted by redsunx View Post

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.
Have you measured the voltage between your "17V rail" and ground? I think you will find it is not 17V.

Sure, you can add a 9V battery...in series.
Quote:
Originally Posted by just_nuke_em View Post

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.
Thanks for the backup thumb.gif
Quote:
Originally Posted by Big-Pete View Post

someone try this with the 5000rpm ultra kazes.
Send me one and I will test it with my real 17V benchtop PSU as opposed to the 17j volts that redsunx is getting from his PSU .
Edited by ARandomOWL - 1/2/12 at 9:13pm
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post #13 of 51
1/2/12 at 9:48pm
Thread Starter 
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.

nice thread derail
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post #14 of 51
1/2/12 at 10:00pm
Buy better fans.

Redsunx, you are not running 17v. Different voltage sources in parallel are going to be somewhere between the two voltages of the sources. Also don't do it.
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post #15 of 51
1/2/12 at 10:16pm
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Please record whatever happens it should be cool, or not, but just in case. biggrin.gif
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post #16 of 51
1/2/12 at 11:02pm
Quote:
Originally Posted by ARandomOWl View Post

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.

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
Edited by killabytes - 1/2/12 at 11:40pm
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post #17 of 51
1/2/12 at 11:12pm
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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 17V. Same if you had 12V and -5V, you'd have 7V.
Source: My degree in EE. wink.gif

then please make a 17v rail run one of these off it and record the outcome!!! thumb.gif

8000rpm@ 12v = 11.360rpm @17v

ive been mixing up brands, i meant Delta Fans. thumb.gif
Edited by Big-Pete - 1/2/12 at 11:16pm
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post #18 of 51
1/2/12 at 11:30pm
Listen to mootsfox. Don't connect your +12V and +5V rails in parallel. Anyone telling you otherwise is simply wrong. If you are desperate to achieve your +17V potential, then use a boost converter circuit (as mentioned earlier) or an external power supply (perhaps old laptop supply). best of luck.

Edit: Don't do this. Although it depends on the fan, lifespan will be significantly reduced to days or even seconds.
Edited by christianhahn - 1/2/12 at 11:34pm
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post #19 of 51
1/2/12 at 11:33pm
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 17V. Same if you had 12V and -5V, you'd have 7V.
Source: My degree in EE. wink.gif

Well that's true, but you can't magically "have" 17V if you have also 12 and 5. If you connect a device across 12V and 5V, the device "sees" 7V. From my knowledge, the only way you can "get" 17V from 12V and 5V sources is by using a boost converter or similar circuit.

Ok, I don't have a degree yet, but I'm getting there wink.gif It's unbelievable the amount of people who argue against the basic principles of electronics.
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post #20 of 51
1/2/12 at 11:38pm
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 17V. Same if you had 12V and -5V, you'd have 7V.
Source: My degree in EE. wink.gif

If you have a +12v and +5v, the potential difference is 7v.... not 17v.

EE here as well.... but rusty.

BTW, redsunx is wrong. That would be shorting the +12v and +5v circuitry... the results are unpredictable and possibly damaging depending on PSU design. It however would definitely not be +17v.
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