| 摘要 |
To reduce battery drain by a DC electric motor (e.g. in the case of an ambulatory monitoring tape recorder) the motor is fed with pulses of current derived from a pulse circuit that includes a differential amplifier monitoring the voltage difference between a first reference voltage that is related to torque load on the motor and a second reference voltage that is derived by adding a sawtooth waveform to a base signal that is proportional to the voltage across the motor.
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