Stay Cool This Summer: PC Fan Mod

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About: Awesome Electronics Tutorials, Projects and How To´s

Who does not have a dozen of those PC Fans laying around? In this build I will show you how to use those fans to produce a nice adjustable breeze during hot summer days. And it runs at least 4 hours with an ordinary 9V battery.

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Step 1: Watch the Video!

The video gives you a pretty nice overview on how to build this mod. But I am going to give you some extra information in the next steps.

Step 2: Order Your Parts!

Step 3: Build the Circuit!

Here is the schematic for the circuit. I recommend to build the circuit on a breadboard first. And then move it over to the sides of the fan. But it is a pretty simple circuit and perfect for beginners.

Step 4: Success!

There you go! Now you can refresh yourself pretty easily with only a 9V battery.

Feel free to check out my Youtube channel for more awesome projects:

http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information.

https://twitter.com/GreatScottLab

https://www.facebook.com/greatscottlab

1 Person Made This Project!

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34 Discussions

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EduardoP54GreatScottLab

Reply 2 months ago

Hallo Great Scott! I'm building a cooled laptop stand but ím planing on using my fans to fuul capacity, i.e., 12 V. Does this higher voltage input require any changes to the circuit? Either capacitance or resistor values?

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rawat006GreatScottLab

Reply 3 years ago

can NE555 works properly if we use 12V in the same design?

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BrynM3

Question 11 months ago

is the ground the negative because where does the negative go

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BrynM3

Question 11 months ago

bit confused with the diagram

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wiryadiu

Question 1 year ago

If my Fan is 24 Volts and input Volt is 24 Volt, what changes are needed ? please your kindly advice.
thank you Scott

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Keiichii FranciscoT

2 years ago

i mimic this projects.. but my power supply is 5volts/power bank... tip29 transistor... 5 volt fan...ceramic cap 2nF and it works excellent! :)

i use different components cuz some of it are not available or out of stock on our local electronics store...

20170302_132915.jpg
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yossef987

3 years ago

Can i use a Ne555N instead?

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jpmorgan34

4 years ago on Introduction

I used the same designee and I 3d printed a case for it. Thanks so much for this awesome demo works great

1 reply
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HiExplosives99jpmorgan34

Reply 3 years ago

Sorry for such a late request, but could you possibly post the files for the 3d printed case on Thingiverse, or a similar site? That is, if you still have them of course.

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dansassin

3 years ago

Something worth noting is that some fans (including the one I tried) have a voltage cutoff point, where it will not spin at all if it is too low. For the fan I used, it happened to be around 8 V before cutting out, which caused a lot if confusion for me.

For simply testing the circuit, I'd suggest hooking it up to a bare motor with no internal circuity.

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ahmedsidd

3 years ago

pls can you tell how much volts does the 2.2 and 10 nf are??????

1 reply
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pradyumna s nadig

3 years ago

greatt Scott u do great videos n I suggest u to do an laser security alarm for your next project so can you do this project for me

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theGiallo

4 years ago on Introduction

Thanks for this instructable! I've learned about the existence of PWMs! :P
I bought this LED dimmer for 3.57€ and tried it out on some PC fans.
http://www.amazon.it/gp/product/B00DSG4QLC
The fan slows down, but makes noise, as if the frequency of the PWM was too low. Is it possible?
For now I have no speed regulation. Uh, I'm using a 12V 1A DC power adapter.

2 replies
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The frequency of the signal is hearable due to the vibrations of the coils of the fan. You would need to increase the frequency. But that is not possible with such a product.

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teddy_ho

4 years ago on Introduction

i think we can use more cheap battery charger AA 1.5v, using dc to dc step up module to get 9v, how about that ??

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PedroM9

4 years ago on Introduction

Could I use 3.3nF capacitors or even two 1nF capacitors in parallel to use in place of the 2.2 ones?

And also, why is there two positive 9v poles in the circuit? Isn't there just one battery in there? Isn't the ground of the circuit the negative of the battery?

(I know its a pretty dumb question, but hey, there's always a first time for everything" xD)