Tamiya 70203 3-Speed Low-Current Motor Gearbox STEM Kit  [70203]

Tamiya 70203 Low-Current Motor Gearbox for classroom and bench experiments

The Tamiya 70203 Low-Current Motor Gearbox is a practical pick for hobbyists and educators wanting a clear example of basic mechanical and electrical principles. The unit is designed to accept both alkaline cells and low-voltage solar panels, giving flexible power options for projects.

Transparent construction and core features

Made from clear ABS, the gearbox exposes its internal gears so learners can observe how torque and speed change across stages. It offers three selectable ratios: 12.7:1, 38.2:1, and 114.7:1, so you can tune speed and torque for different builds. The 3mm hex drive shaft and included crank plates can also be used as simple wheels for small models.

Integration with common project frames

The housing includes 35mm mounting holes that fit Tamiya universal plates, making it straightforward to add to chassis or classroom rigs. Use it to drive small robots, moving displays, or solar demonstrators where a compact gear stage is needed.

Power and supply notes

The gearbox runs on standard alkaline batteries in the 1.5-3.0V range or on solar panel inputs rated at 0.5V or 1.5V. Power sources and additional mounting hardware are supplied separately so you can choose the best option for your setup.