Tamiya 70203 Low-Current 3-Speed Gearbox Education Kit  [70203]

Hands-on learning with the Tamiya 70203 Low-Current Motor Gearbox

The Tamiya 70203 Low-Current Motor Gearbox provides a simple, visible way to study mechanical advantage and basic circuits. It is compatible with both battery power and small solar panels, so it suits demonstrations and science projects.

See-through build and selectable gearing

The unit is molded in transparent ABS so you can watch the gears in motion. It includes three ratios: 12.7:1, 38.2:1, and 114.7:1, which let you experiment with speed tradeoffs and torque multiplication. A 3mm hex drive shaft and crank plates are supplied, and those plates can be repurposed as wheels on small prototypes.

Mounting and application tips

With 35mm mounting holes, this gearbox integrates easily with Tamiya universal plates for quick attachment to frames and rigs. It is a handy drive option for small robots, solar experiments, and classroom models where clear demonstration is useful.

Power compatibility

Designed to run from alkaline batteries at 1.5-3.0V or from solar cells rated at 0.5V or 1.5V, the gearbox encourages exploration of sustainable power. Note that power packs and panels are not included so you can select the right source for your project.