can i boost a fan's speed?

[LiveOrDie]

can i boost my 22cm side fan to a fast speed, by adding a CAPACITOR, it runs at 800rpm, 15dBA

 

[EnglishLion]

I don't think you can boost a fan's speed. It is possible to up the voltageand get a little more out of the fan, afterall 12V is the spec and all components will run a little over spec, you'd be overclocking your fan in effect. But if you take it too far your fan motor burn out.

As to where you get a greater than 12V feed for it from within your PC I really don't know.

 

[cdawall]

DC motors will do +/-50% rated spec so you can go up to 18v on them

 

[Cybrnook2002]

Hook one of these up to it http://www.neuros.com/05project/image/proj_01_05.jpg

in all actuality, its probably maxed out. If its plugged int o the MB, you might be able to increase voltage from 8 v to 12 v in the bios. But the best thing is just to buy a new 5 dollar high speed fan. But, the fast usually mean louder. 120's are pretty popular because they rotate slower but move more air. They are more quiet.

By the way, a capacitors main job is to resist change in voltage/power/current. So, hooking a capacitor to it would probably do nothing except keep it spinning a second longer after it loses power. Now, if you hooked a resistor to it, then you could slow it down. But your not going to increase your voltage/speed by any means i can think of right now. Well, at least anything that's practical enough to increase a "fan" speed.

 

[alexp999]

take a look at this:

http://www.overclockers.com/tips808/

it shows how to get all sorts of different voltages. I would try the one for 17v, it is the next highest up from 12v. i don't want to be responsible for you frying your fans though. just trying to help, but dont blame me if something happens, lol. Maybe test it out on a cheapo spare fan or something first.

 

[EnglishLion]

Hook one of these up to it http://www.neuros.com/05project/image/proj_01_05.jpg

in all actuality, its probably maxed out. If its plugged int o the MB, you might be able to increase voltage from 8 v to 12 v in the bios. But the best thing is just to buy a new 5 dollar high speed fan. But, the fast usually mean louder. 120's are pretty popular because they rotate slower but move more air. They are more quiet.

By the way, a capacitors main job is to resist change in voltage/power/current. So, hooking a capacitor to it would probably do nothing except keep it spinning a second longer after it loses power. Now, if you hooked a resistor to it, then you could slow it down. But your not going to increase your voltage/speed by any means i can think of right now. Well, at least anything that's practical enough to increase a "fan" speed.

Yes, what you'd need is some kind of step up transformer to take a voltage up. You may be able to get an AC/DC power adapter like a laptop supply strip the wires back and fit a fan header to it. Then run that 1 fan off the mains - it's way overkill though and certainly not worth it!

 

[Cybrnook2002]

take a look at this:

http://www.overclockers.com/tips808/

it shows how to get all sorts of different voltages. I would try the one for 17v, it is the next highest up from 12v. i don't want to be responsible for you frying your fans though. just trying to help, but dont blame me if something happens, lol. Maybe test it out on a cheapo spare fan or something first.

Hmmmm, im not so sure about that one alex. But interesting find. Crazy what some people will do. I mean it makes sense. He's just taking your reference ground point of 0 and dropping it to -12. So instead of 0-12 being 12 volts, your going from -12 to 12 which is a difference of 24 volt potential. Would i do it....NO. But it makes sense. (BUT....wouldn't that mean whatever is hooked up that way is no longer grounded through your system. It would be on an isolated circuit as its using a separate ground point??) Just a thought!

 

[alexp999]

Hmmmm, im not so sure about that one alex. But interesting find. Crazy what some people will do.

Foudn it after doing a couple of google searches. I don't recommend it but I wanted to show it can supposedly be done.

 

[Cybrnook2002]

hehe, to add to my other reply. ( im getting into this now) I found this:

Negative & Positive polority plays major role in case of
Electronics Devices.We may be aware of simple electronics
components Diode,Transistor,etc are made of PN junctions.
For proper conductions & baising,Blocking Polority of the
circuits is very important


And wouldnt that kind of be a form of going back from DC to AC. Because in respect to earth ground, your going from a +12 down to 0 (earth ground) down to -12, back 0 up to +12. So its a alternating current with no respect to polarities. Right?

 

[LiveOrDie]

Thanks guys im goin to try it on a older fan 1st

 

[EnglishLion]

Thanks guys im goin to try it on a older fan 1st

Let us know how it goes, sounds good. Especially for a extra large fan like your 22cm, that must make no noise at all at the moment, so you'll get a good airflow without huge noise increases I guess.