| 摘要 |
A description is given of a small battery-operated electrical device, which can be driven by an oscillating electric motor or linear motor that can be controlled by an electronic circuit and which has a circuit for determining and indicating the charging state of the battery. When a specific charging state is reached or the charge falls below that state, the control circuit activates the oscillating electric motor or linear motor in such a way that the noise of the motor changes. When the specific charging state is reached or the charge falls below that state, the control circuit preferably activates the oscillating electric motor or linear motor with a control signal of a progressively decreasing frequency and/or pulse width. |
