DC DRIVE Russian patent published in 1997 - IPC

FIELD: DC motor speed control for devices, such as sound recorders and reproducers. SUBSTANCE: DC drive has series-connected first resistor, control transistor, and electric motor. It also has voltage divider, two transistors of which first one has its emitter connected to negative terminal of power supply through second resistor and through third resistor and switch. Transistors are inversely connected which increases translator transient time. EFFECT: improved reliability of motor starting at various characteristics of circuit components and transistors. 1 dwg