Abstract: An electronic pipette real-time responsive to manual operation includes a pressing unit, a signal generator, a controller, a power unit and a drawing/draining unit. The signal generator senses a displacement stroke of the pressing unit by user and generates a displacement signal to the controller. The controller performs calculation on the displacement signal to generate a control signal for sending to the power unit. The power unit drives the drawing/draining unit according to the control signal. The amount and speed of the drawing/draining can be shown on a display of the controller.

Abstract: A charging device comprises a voltage stabilization unit, a charging unit, a battery protection unit, and a voltage setting unit including a control circuit, a voltage adjustment circuit, and a voltage selection circuit. The device can output a selected one of a plurality of voltages to one of various portable electronic devices being connected for achieving a great adaptability by possessing only one charging device. Moreover, the device is connectable to external power source or automobile power supply depending on applications. Hence, it is convenient in use.

Abstract: A charging device having a voltage stabilization unit, a charging unit, a battery protection unit, and a voltage setting unit. The voltage setting unit includes a control circuit, a voltage adjustment circuit, and a voltage selection circuit. The charging device can output a selected one of a plurality of voltages to one of various portable electronic devices such that a plurality of portable electronic devices can be charged with only one charging device. Moreover, the device is connectable to external power source or automobile power supply depending on applications. Hence, it is convenient in use.