12V computer fan

[KEGS]

Thank's For all your tip's you have all
Been Helpful Thank's : Keg's

[THINKGREEN420]

i have 2 12 v fans i took from an old tower of mine i read the posts about gettting the 12 v power adaptor but is then pluged in an outlet or can u use like a couple 9v batterys to power them?

[MegaOctane12]

To do that it needs to be in parallel.

I took electronics and engineering at school.

What do you mean parallel? Not having all the fan wires mashed together?

[altec3]

You could run it off of two nine volts if you wanted to, the only problem is thats 18 volts, which your fan may or may not run on. You would have to wire a 12 ohm, 3 watt resistor in to make it 12 volts but that would waste energy and cost money. Also the batteries will not last very long and it would get very expensive. If you wanted to run it on disposable batteries I would get 2 of those huge 6 volts as they will last much longer. By far the best way to go would be to get a 12v lawn mower/utility battery for 20 bucks at wal-mart. The only problem with that is you would have to charge it fairly often. If you bought this, http://www.siliconsolar.com/shop/cat...ger-p-133.html or something like it you would keep the battery charged by solar power. Since the fan is a motor and motors drain batteries like no other I would highly suggest not using a battery. Well anyways hope that helps

[turtle420]

What do you mean parallel? Not having all the fan wires mashed together?

Serial vs Parallel wiring.

The two AA batteries inside your remote control, are connected in "serial". Check them out. Follow the metal strips.

Parallel, would be... um, positive+positive+positive

Serial would be positive+negative+postivie+negative (<-- this doesn't make much sense, but I need to log-off... )

Peace dudes!

[MegaOctane12]

Don't get what you mean at all sorry. I got one fan on the top end of the adapter wire and I add one further down and another further down e.t.c e.t.c. None of the fan wires touch and all are black to black and red to black with stripe.

[altec3]

I googled a pic and this seems to explain it pretty well. Figure A is in series and Figure B is in parallel. Off of a 12v supply you would want to hook all your fans in parallel. This means that all the fans hook directly to the battery/adaptor and not to each other. If you wired two fans in series they would split the voltage giving each fan roughly 6 volts. Running in parallel uses more amps and will also drain your batteries faster.

[MegaOctane12]

That explains it. I wouldn't have even considered wiring the fan wires like that its just common knowledge.

[mordok]

around here, people give away old computers through a Freecycle network. some work, some don't. but if the computer's power supply is ok, you have a 5v and 12v power source. the size could be a problem. if you are already stripping a computer for fans, then consider keeping the power supply and hooking fans to it. the wire to the fans doesn't need to be very heavy, unless you run one line from the power supply to where the fans are being used and then running all the fans from this one line. then maybe 16 gauge or 14 gauge wire would help. i always keep power supplies and fans when i strip a computer that isn't worth fixing. there are power dividers that can split the output from one power supply lead to two drives or whatever and it wouldn't be hard to come up with the connectors to match the connectors on the power supply.