inside a cordless drill (with schematic & gearbox autopsy)

What's inside a 12V cordless power drill / screwdriver. Including the schematic of the motor speed regulator (controller) and an autopsy of the gearbox with its adjustable torque mechanism. It probably had a 3-cell Li-Ion or a 10-cell NiCd battery.

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Видео inside a cordless drill (with schematic & gearbox autopsy) канала DiodeGoneWild