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Well here i am with another question for all the experienced electronic guys.

For a little project im working on i would need a portable fan but as usual the budget is very small so i cant just buy one, ive got a fan from my pc left that i dont use and i was wondering if its possible to put it on a 9volt battery, theres one problem that there are 3 cables, black red and blue but as u may know a battery only has + and - , well if anyone with some electronic knowledge or experience could tell me if its possible id really appreciate it.

thx

should be no problem, just use black and red, the blue one is most likely for the speed regulation when using a temperature sensor. and even if you connect the wrong cable for a quick check it´ll not damage the fan...

thanks it works just as i want it, no noise, cool wind

bad_brain wrote:should be no problem, just use black and red, the blue one is most likely for the speed regulation when using a temperature sensor. and even if you connect the wrong cable for a quick check it´ll not damage the fan...

how you know all this random stuff is amazing ha ha ha

hehe...well, electronics was a big hobby of mine before I started with computers again, I used to build tube amplifiers and tuning stuff for stereos like powerfilters...

damn that was kinda stupid from me, paid 4euro for a battery but it doesnt las a night , is it possible to plug it in the wall somehow? i need like 3 to be on all night maybe also during the days for a few months so batteries arent really usefull.

youll have to get a power cord that converts the voltage from the wall to a lower voltage so that the fan will run for example

lets say i have a DC brushless fan motor (from a pc of course) that uses

12 V---DC 0.22A
(look on the fan motor for something similar to this)

now find a power adapter that you dont need and look for something that looks like this

Input: AC 100-240V 50/60 HZ 0.35A
Output: DC 12 V 1.2A

(it wont look exactly like this) youll want to try to match the output value of an adapter as closely to that of the input of the fan like i mentioned above, its important to have the A as close as possible (A stands for AMPS)

bad_brain wrote:hehe...well, electronics was a big hobby of mine before I started with computers again, I used to build tube amplifiers and tuning stuff for stereos like powerfilters...

wow how hard is that? there wouldn't be any programing involved would there?

right Circuit, except the Ampere thing....
the Ampere output is the capacity of the adapter, so a 12V adapter with 1 Ampere can handle 12Watts (V*A=W). so when a fan has an energy usage of 6 Watts the adapter could handle 2 of them. if you just plug a 6 Watts-one on a 12 Watts-adapter the fan still just uses 6 Watts....

magiceiko: nope, no programming in there.... but it´s a lot of fun, check this one, it´s the amp I´ll get when I´m rich:
http://www.kraudioproducts.com/Kr/Enlar ... ductID=116

the tubes of these babies were formerly used in the radar-devices of russian MIG jets, they have the size of large beercans...

looks like something striaght out of frankenstines lab.

yuea brain, yu are right about that, but efficiency is key i suppose, id rather be more on the money, than be off or out of it simple circuitry will explain everything in this post, you can google it im sure, oh and by the way, i leanred to do this by taking cassete motors and making them into tattoo guns, using power supplies to run the motors, fun fun, no regrets

wow, I´m really looking forward then to the suck-o tattoo on my forehead you´ll be doing for me when we meet for DEFCON...

thanks for all the help guys, im gonna buy a suitable adapter as soon as the budget allows me to,ive searched all myold adapters but none seems good.