Quantity   Component name
1 × IRFZ44 (IRFZ48N, STW80NE06-10) TO-220 or TO-247 FET with low resistance (RDSon), order spares.
1 × A3144 Hall Sensor
2 × 2n3904, 2n3906 general purpose NPN and PNP trannies
2 × 1K Ohm 1/4W resistor
1 × 5 Ohm 1/4W resistor
1 × Magnet Wire I used 25 AWG, but about anything will work
1 × 100 to 1000uF Rated voltage needs to be higher than coil supply voltage.