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The tape-rotting mechanism allows the magnetic tape to move at a constant speed, as well as accelerated rewinding of the cassette in both directions. Contains an electric motor, a tonval flywheel with a clamping roller, magnetic heads and actuators of the receiving and feeding node of the magnetic tape. In the simplest case, it consists of two wheels with two passicles, one with two pulleys is mounted on the tonnage, the other contains a friction clutch, a dosing force on the receiving wheel. The wheels are connected by passicles, while the other passic connects the thonval wheel with the electric motor. The most advanced LPMs have an autoreversal (2 symmetrical tonals rotating in opposite directions, each with its own clamping roller), electronic control (usually using a system of gears with locks and levers and electromagnets). There may also be automatic cassette receivers with a separate electric motor.
The electric motor in middle-class devices is usually used collector with a special control scheme that allows to stabilize its rotational frequency under variable load and power voltage (especially when powered by batteries). In the simplest case, the circuit is assembled on two transistors. The circuit is a node having a site with negative differential output resistance. In Japanese tape recorders, as a rule, it is made on a specialized chip and built into the body of the electric motor. In Soviet tape recorders, the circuit was traditionally made on the KR198NT11 transistor microassembly.