How to connect a 12V DC fan to a 120-250V AC power.

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Old 01-17-16, 09:26 PM
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Question How to connect a 12V DC fan to a 120-250V AC power.

Hello,
I have to connect a 12V DC fan to my 120-250V AC Hot Glue Gun for a science project's sake... But as I power the fan I also have to power the Glue Gun too...
So, I am asking for a solution and any help will be appreciated...
 
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Old 01-17-16, 09:33 PM
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Since you're not from the States..... you'll need a multi input voltage power supply.
What amount of current does your fan require ? It may be amps, watts, ma.

You'll basically need a 12vdc power supply that will plug into your wall socket.
Wouldn't the glue gun do the same thing ?
 
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Old 01-17-16, 09:41 PM
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Sorry but I think you dont get it... I need it to be ONE Power Cord... You know the small cooling fans of Old PCs
 
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Old 01-17-16, 09:45 PM
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You can't have one power cord for two types of power at different voltages. You could strip the blower out of a hair drier or use a 250 volt cooling fan for electronic equipment.
 
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Old 01-17-16, 09:52 PM
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Can't I use something like an adapter INSIDE the glue gun???


Sorry If I'm making no sense... I'm competely new to electrical stuff..
 
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Old 01-17-16, 10:56 PM
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The adapter wouldn't fit inside any glue gun I've seen.
 
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Old 01-18-16, 04:15 AM
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No I mnt the circuit of the adapter...
 
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Old 01-18-16, 04:44 AM
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Mushfig, are you locked into using a 12vdc fan, as I have one from an old computer that runs on 120v. If you could find one of those, you wouldn't have to resolve the conversion of ac to 12v dc.

Just a thought.

Bud
 
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Old 01-18-16, 08:38 AM
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I like your Idea but the fan I will use will have to be small... So I am not really sure if a small fan would run on 120v... so...
 
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Old 01-18-16, 08:52 AM
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Or can I use a resistor to do the same thing??
 
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Old 01-18-16, 09:43 AM
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Or can I use a resistor to do the same thing
No. If you describe in detail what you are trying to build we could better help you.
 
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Old 01-18-16, 09:47 AM
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Ok ummm.... I did some research... but I have some questions...

If I use a 1600 ohm resistor to decrease the voltage from 120v to +-12v and use a ac to dc converter to power the fan ... will It work...

And what I am trying to build is here in this video...
https://www.youtube.com/watch?v=0MFmsBpYXTk
 
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Old 01-18-16, 10:14 AM
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Very informative. If you look carefully at the video you will see he uses a separate cord for the fan. The fan is a simple 12v DC computer cooling fan.

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Old 01-18-16, 10:18 AM
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If I use a 1600 ohm resistor to decrease the voltage from 120v to +-12v and use a ac to dc converter to power the fan
How did you come up with 1600 ohms? If you use an AC to DC converter one of its functions is to reduce the voltage to the proper voltage. Look up full bridge rectifier to see how to change AC to DC. But none of that is needed. Just use two cords. If you want to make it neater you could use bands of tape every foot or so to keep them together.
 

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Old 01-18-16, 10:20 AM
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This thread sounds like we're going to be re-fighting the battle between AC and DC (Westinghouse versus Edison) all over again.

AC and DC are similar . . . . but they're different !
 
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Old 01-18-16, 10:53 AM
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OK thanks a bunch...
And the power on our country wall plugs are 250V... But even though he used different cords... I can't... for certain reasons... So... the question remains is it possible to make a ac to dc converter that also reduces the voltage... I need to make it because its a science fair project... so yeah... Help if you can PLEASE!!!!
 
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Old 01-18-16, 11:03 AM
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But even though he used different cords... I can't... for certain reasons
Tell us the reasons and maybe we can help.
 
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Old 01-18-16, 11:25 AM
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Its because it will be a science project and for that I want to make it ONE object that will occupy only one of the multiplug ports... OOOOOORRRR... Can I just use the two different power cords (One of the glue gun and one of the 12V adapter) and put em together in one plug??? That should work right??
 
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Old 01-18-16, 11:47 AM
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I'm mssing the "science" in this Project, and wonder what kind of Teacher is involved.

I once knew a guy up here who wanted to install a Converter on his truck so that he could convert 12 Volt DC to 110 Volt AC.

That way, he figured if he ever had a dead battery in a remote location, he'd be able to plug his Battery Charger into the Converter, charge up that dead battery . . . . and everything would be right with the World.

He caught on AFTER he finished his Project.
 
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Old 01-18-16, 05:48 PM
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Can I just use the two different power cords (One of the glue gun and one of the 12V adapter) and put em together in one plug???
Yes, as long as you do it safely.

Since your fan will be very low power device, you could find a small 12V power adapter and attach to side of the glue gun and wire AC power to power adapter inside glue gun.
100mA probably is more than enough for the fan in the video. Not sure what size is the fan you have, but it will say how much current it needs on the fan.

Most of small power adapter are made to be plugged straight into the wall outlet. But if you have soldering iron, you could open up the power supply, remove prongs, and solder wires to it. Then you can connect this wire inside glue gun.
 
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Old 01-19-16, 03:31 AM
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Thumbs up No further help required!!!

Guys all of you... Thanks for helping me!!! I have solved my problem and there is no further help required...
 
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