Super easy battery powerd computer fan

This is a really easy thing to make out of a bunch of recycled stuff. I had a bunch of extra computer fans so i decided to get some use out of them. Take a look. Sorry if this is not original.

Step 1 Materials

A computer fan (the bigger it is the more air it pushes)
A switch
A 9v battery
A 9v battery clip (thanks to the instructable on how to recycle 9vs i made my own)
dremel
drill

Comments

[acurrie2]

hello ,
im lost . im doing a thing for a solar project and needed 2 fans one to bring air in and the other for pushing the air out . i picked up a fan it has a double fans, it comes with black , red, blue and brown.
my questions is how to i find out what is the (-) and (+) . clearly there is 2 (-) and 2 (+) but can i hook it all to one battery or should i get two batterys one for each fan?also if its a 12 v dc what size battery should i use to get more then just a couple of hours ?

thanks!

[creat0r]

hi, does your fan have a sticker on it? it should. all my computer fans. look closely on the sticker, it should tell you the polarity. like,

+:Red, -:Black

or something like that(im looking at a computer fan for a windows XP here :P

[jli5]

Hi, I don't understand this step very well because I have never played around with a switch.
How did u attach the switch? Just cut half way between the red wire (which is connected to the fan and the battery) and just insert the switch in the middle?

Also, what kind of switch is the one in the picture? What kinds of switches are the smallest?

Thanks for the great guide!

[jordomaller]

what if you use a potentiometer to regulate thespeed it has a resistor or something would that keep it from blowing up?

[dragontirex]

if you use an good battery it will run few hours :d

[mrjubjub]

Okay, for one, don't do this ever again two, you are going to blow up the battery because you are using a 12 volt DC fan with a 9 volt battery. After a while, the battery will heat up and eventually (most likely) explode. i recommend against doing this! just use a 12 volt supply

[dog digger]

No mrjubjub, It will be fine. I've made plenty of these. I can run a 24v motor with a 6v battery. Don't use A23s for this, the fan will drain it in under 2 hours.

[Pointy130]

Say that to the 3 exploded batteries I have from when I did this. The only good thing I got out of it was a manufacturer's coupon for replacement batteries.

[geekdude]

i dont think it will blow up, just turn the fan real slowly, and mabye mess up the motor? it would be diffrent if it was anything other than a motor. of course i could be wrong

[account3r2]

all it will do is make it run slowly. you could se a 23A or similar 12v battery.

[Danny_Payne]

what is the blue one for?? temp??

[xAxrules]

RPM sensor

[Junkyard Dawg]

What are the extra wires (I.E. the blue wire) mentioned for?

[xAxrules]

Two cables = just power
Three cables = Power + speed sensing
Four Cables = Power +speed sensing + PWM control

[meh301]

Can you please help? My fan is 12v and it does not go at full speed and I NEED it to go full speed.

[account3r2]

use a 23A or similar 12v battery. and a 23A battery is smaller than an AA, so it will take up less space.

[fwjs28]

add another battery 9v+1.5v(AA batery)+1.5v=12v

[geekdude]

no two aa batteries

[BOHUNTER08]

How long can the fan run on a 9v? Could you use a bigger battery for longer use... say a week non-stop?

[sharlston]

it only runs foir around 15 mins i have the same fan normally if im red hot ill run about 48v through it

[badboypl3]

grow box?

[MT-LB]

the sealed lead-acid batteries from battery backup systems are good for this.

[éolien]

Hey, great idea! Everything's simple and easy. thank you. congrats!

[Dunkm1n]

Were you at all able to determine the RPMs of the fan, cus I was looking at adding some 9v powered fan to a cooling mat I was working on and wanted to know if a 9v would be enough for 2 or just one (as on paper the math comes out to 2 fans at 2500rpm)