For this device you do not need an Arduino or equivalent microprocessor. Do make sure you have enough 3mm material to cut the design from and a bunch of M3 10mm bolts and nuts for the assembly.
| No | Amount | Description | Supplier NL | Cost |
|---|---|---|---|---|
| 1 | 1 | 80 mm Fan | Farnell, EOO | 3.35 |
| 2 | 2 | Permanent magnets | Supermagnete | 0.85 |
| 3 | 1 | Potentiometer 100 ohm 2W | Farnell, RS Online | 6.34 |
| 4 | 4 | Power switch | Farnell, iPrototype | 2.35 |
| 5 | 1 | DC power jack | Farnell, EOO | 0.85 |
| 6 | 1 | 7.5 W power supply | iPrototype, EOO | 12.50 |
| 7 | 1 | Red LED | Farnell, EOO, iPrototype | 0.15 |
| 8 | 1 | 470 ohm resistor | Farnell, iPrototype, EOO | 0.04 |
| 9 | 1 | Magnetic stirring rod | Hinmeijer | 3.21 |
| 10 | 4 | Rubber feet | Conrad | 0.10 |
| 11 | 1 | Heating foil | Sparkfun, Conrad | 4.50 |
| 12 | 3 | 68 Ohm 5W Power resistors | Farnell | 0.37 |
| 13 | 1 | Superglue | SuperMagnete | 8.08 |
Estimate total: EUR 42.69
Alternatives
- You could use all kind of motors, for example from a hard drive.
- Take a USB coffee mug heater apart for the heating foil or use a cheap power resistor to save money