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.

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!

Here is the small parts list with example sellers (affiliate links):

Ebay:

1x NE555:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x BC547:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x 1kΩ Resistor (1/4W):http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

3x 1N4007 Diode:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 10kΩ Potentiometer (linear):http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x 2.2nF Capacitor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 10nF Capacitor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Battery Clip:http://rover.ebay.com/rover/1/711-53200-19255-0/1?..

Amazon.de:

1x NE555:http://amzn.to/1kQM9UX
1x BC547: http://amzn.to/1wWRbVs

2x 1kΩ Resistor (1/4W): http://amzn.to/1A2KZzi

3x 1N4007 Diode: http://amzn.to/1A2KZzi

1x 10kΩ Potentiometer (linear): http://amzn.to/1A2KZzi

2x 2.2nF Capacitor: http://amzn.to/1A2KZzi

1x 10nF Capacitor: http://amzn.to/1A2KZzi

1x Battery Clip: http://amzn.to/1A2KZzi

Aliexpress:

1x NE555:https://s.click.aliexpress.com/e/_dTrUY9D

1x BC547:https://s.click.aliexpress.com/e/_dSqRC3z

2x 1kΩ Resistor (1/4W):https://s.click.aliexpress.com/e/_dTPpXjt

3x 1N4007 Diode:https://s.click.aliexpress.com/e/_dYR45Bh

1x 10kΩ Potentiometer (linear): https://s.click.aliexpress.com/e/_dX83GAF

2x 2.2nF Capacitor:https://s.click.aliexpress.com/e/_dU4FEsB

1x 10nF Capacitor:https://s.click.aliexpress.com/e/_dU4FEsB

1x Battery Clip:https://s.click.aliexpress.com/e/_d6x6Uq7

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.