The material list is based on the Requirements list

Bill of Materials

For this device you do not need an Arduino or equivalent microprocessor.

Must have

# Amount Description Supplier NL Cost
1 1 Fan EOO, Farnell 8.99
2 2 Permanent magnets Supermagnete 0.65
3 1 Potentiometer 100 ohm 2W Farnell, Ebay, Mouser, RS Online 6.13
4 1 Knob Farnell, (EOO + EOO) 0.23
5 1 Power switch iPrototype, Farnell, EOO 0.95
6 1 Power jack EOO, iPrototype 0.85
7 1 Power supply iPrototype, EOO 13.95
8 1 Red LED EOO, iPrototype 0.15
9 1 470 ohm resistor iPrototype, EOO 0.45
10 1 Magnetic stirring rod Hinmeijer 3.06
11 1 Heavy weight, max 12 cm diameter Bol 4.72
12 4 Rubber feet Conrad 0.08
    Total costs    
  • You will also need some M3 10 mm bolts and nuts

Alternatives

  • You could use all kind of motors, for example from a hard drive.

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