I needed a magnetic stirrer for my chemistry lab so I made a cheap one that looks almost like a professional one, but doesn't cost very much.
It is made from recycled parts from an old CD-ROM, a printer motor and things from an old CRT screen board (like resistor).
The things you need:
- a CD-ROM metalic case (or what case you want)
- a piece of aluminium sheet
- 10 screws (3 mm diameter)
- 6 screw nuts (for 3 mm screws)
- 2 circular magnets (1 cm thick, 1-1.3 cm diameter)
- a 5.5 cm circular aluminium sheet
- a little passive heatsink (optional)
- a printer motor (almost any motor could be used )
- 1 little screw for motor
- a LM317 chip
- one 0.1 uF capacitor
- one 10 uF capacitor
- one 5K potentiometer
- one 240 ohm resistor
- a universal board for electronics (4 cm width x 2 cm lenght)
- a 12 V AC power supply
Step 1: Step 1
Firstly let's drill some holes.
Drill the small holes with a 3mm drill bit, the big one I drill with a 10 mm drill bit and the smallest with 2.5 mm drill bit.
Images have indications about lenght and width, so don't miss them,