This gearmotor is a miniature (0.94″ x 0.39″ x 0.47″), high-quality, low-current motor with 150.58: 1 metal gearbox, similar to Sanyo s popular 12 mm gearmotors. These units have a 0.365″-long, 3 mm-diameter D-shaped output shaft.
This shield allows you to use a computer power supply (or other power source) to use your Arduino to switch high current. With RFP30N06LE MOSFETS, you can easily control a lot of current directly from your Arduino.
This NEMA 23 size bipolar stepping motor has a 1.8 Degree step angle (200 steps/revolution). Each phase draws 2A at 3.2V, allowing for a holding torque of 9kg-cm (125 oz-in).
This NEMA 16 size bipolar stepping motor has a 1.8 Degree step angle (200 steps/revolution). Each phase draws 330 mA at 12 V, allowing for a holding torque of 2.3 kg-cm (32 oz-in).
This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor. The little 1.3 0.8-inch board supports a wide 5.5 to 50 V voltage range and is efficient enough to deliver a continuous 9 A without a heat sink.