CaseFan Question

[djurom]

I have 80mm case fan blowing in air and same model to suck out. I'm not satisfied with the first one so I'm thinking of wiring it to +12V+5V. Will that fry him or what? Do I have to maybe use resistor to get 15V?

[jaida]

You cannot really do make a ps run at 15v you can try 17v but it wont run effectively or it might not even work.

To do this you would hook the +12v lead and -5v lead tougether to = +17v

But the problem is that the -5v has low amps therefore low wattage and not really enough power to run anything even though its rated at -5v. Therefore it wouldn't run effectively at 17v also it depends on the ps as to whether you can actually try this.



[This message has been edited by jaida (edited 02-19-2001).]

[djurom]

I think you're wrong because with -5V would slower the fan. +12V-5V=+7V isn't this right? I think there was even a disscusion with this problem when somebody wanted to make his fan run more silently but I want just the opposite.

[Bsdboy]

jaida is right on all counts,voltage is
a difference of potential IE:the difference of potencial between + 12 and -5 is 17 but
I agree I don't think is will work.

[OuTpaTienT]

Yes it'll work just fine. Your fan(s) will be considerably louder at 17v, but you probably already know that.

If ya have any doubt at all check this:
Google search: case fans 17v (http://www.google.com/search?client=googlet&q=case%20fans%2017v) and you'll see quite a lot of other people doing the same thing.

And here is one of the better "how-to's" on increasing the fan voltage:
Up That Fan Voltage, More Cooling Power (http://www.hardocp.com/articles/kuperman/ocp_fan_voltage_tweak.htm)

[djurom]

Thank you for your replies.
OuTpaTienT, great links! http://sysopt.earthweb.com/forum/wink.gif