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)
<p>I've discovered a nine volt battery will quickly become too hot to touch. I've haven't had one explode but they die quickly. Same thing with 4 AA batteries(1.5 volts each=6 volts). I have a battery holder for 3 AAA batteries (4.5 volts), which will run a small computer fan but not a larger one, and I just ran it briefly because I feared the same fate. You also can get a holder for 8 AA batteries, which equals 12 volts, so maybe that might work (haven't tried it yet). My interest mainly is to spread the heat from a propane wall furnace in my workshop and make corner fans in the house to move heat from a gas fireplace, avoiding the expense of electrical fans. It's not worth it if the batteries cost more than the electricity, of course, but maybe 12 volts worth of batteries will last.</p><p>For Debra V3, everything you need is available at electronics stores, like Radio Shack, including toggle switches, which go between the power supply and the fan to turn it on and off. You also can get battery holders, which attach to devices just as 9 volt batteries do.</p>
<p>Looks easy enough. I'll try it for a heater in my workshop.. Thanks!</p>
<p>Where did you get the switch? Could I dismantle something like a toy helicopter remote control and use the slider on/off switch?</p>
I'm currently constructing a mascot costume that will be featuring fans to keep the wearer cool. I have 4 5v fans, 2 of which are 2 inches wide and the other 2 are about 1 inch. I have a 6v battery holder box for 4 AA batteries, and I was wondering if it was possible to connect all 4 fans to one battery pack. However, I may be ordering a battery pack with a switch already attached as well. It holds 4 AA batteries but it's labeled at 4 x 1.5v? I'm new to this sort of stuff, so does that mean it is 1.5v or 4.5v, and if it's 4.5v would it be suitable for 5v fans? <br><br>Any help would be incredibly appreciated!
<p>Would it help to use a transformer to step up the current to 12v? I don't know how it would work because transformers only take AC current right? And it also would not increase the current (transformers are passive). So maybe to make it safer, you could connect 3v in series with the 9v?</p>
You all do realize if it's a small fan u can just use USB pose a big fan will work two just will be slow
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
<p>If you run the 9V in series it is fine, use two 9V and run them in series rather than parralel. So esentially U get 18v rather 9v wich will give you enough Volts to cover the 12 needed for the fan.</p>
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.
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.
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
all it will do is make it run slowly. you could se a 23A or similar 12v battery.
<p>My cooler fan has three wires black, yellow and green . Black is confirm but wt bout other two &gt;&gt;&gt;&gt; Which one should i use GREEN OR YELLOW?????</p>
Hi, I don't understand this step very well because I have never played around with a switch.<br>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?<br><br>Also, what kind of switch is the one in the picture? What kinds of switches are the smallest?<br><br>Thanks for the great guide!
well either cut the wire or add more wire to it. The switch should either be attached to wires by a screw or soldering. Which of course you probably know it opens the circuit.
hello ,<br> 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.<br>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 ?<br><br>thanks!
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,<br><br>+:Red, -:Black<br><br>or something like that(im looking at a computer fan for a windows XP here :P
what if you use a potentiometer to regulate thespeed it has a resistor or something would that keep it from blowing up?
if you use an good battery it will run few hours :d
what is the blue one for?? temp??
RPM sensor
What are the extra wires (I.E. the blue wire) mentioned for?
Two cables = just power<br>Three cables = Power + speed sensing<br>Four Cables = Power +speed sensing + PWM control
Can you please help? My fan is 12v and it does not go at full speed and I NEED it to go full speed.
use a 23A or similar 12v battery. and a 23A battery is smaller than an AA, so it will take up less space.
add another battery 9v+1.5v(AA batery)+1.5v=12v<br/>
no two aa batteries
How long can the fan run on a 9v? Could you use a bigger battery for longer use... say a week non-stop?
it only runs foir around 15 mins i have the same fan normally if im red hot ill run about 48v through it
grow box?
the sealed lead-acid batteries from battery backup systems are good for this.
Hey, great idea! Everything's simple and easy. thank you. congrats!
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)

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