Hello there. Now I'm going to show you how to make a magnetic stirrer.

Magnetic stirrer is a laboratory device that is used to mix solutions. And also heat a solution. But my magnetic stirrer is a verry simple one. It can only used to mix solutions.

Step 1: Things That You Need

To make this I used only few things. All of them recovered from old circuit boards. I didn't have a project box to assemble this. So I decided to make it myself. Here are the things that you need....

A computer fan
Magnet ( recovered from hard disk)
A switch
LED (optional)
Wires
1k resistor
D.C. power connector
cardboards (for the box )
Glass sheet (10cm × 10cm)

I got cardboards from old diary. I used hot glue and double sided adhesive tape to make the box and assemble the circuit. I used glass sheet to the top. Because glass is stable with most of chemicals.

Step 2: The Box

Cut above pieces from cardboard. (in the picture) Now punch two holes in the 5x10cm sized board. (one for LED, another one for switch). Then get the 10x3.5 sized board and make a hole to put the dc adapter.

Step 3: Circuit

Before make the circuit, assemble the box with hot glue(2nd picture). Then solder the circuit.

Step 4: Assemble

Now glue the fan to the box and glue the 10x3.5 cm board. Then glue the 5x10cm sized board to the box. Now glue the magnet in the middle of the fan*. Ok. Now keep the glass on the box. You can use a plastic coated metal nails as the stirring bar.

*UPDATE

You can keep a piece of metal between the fan and the magnet. It will stop spilling the motor.