Abstract: A method of command entry for an electronic device. First, a single button is pressed to enter the electronic device into a multi-function entry state, indicated by a first light status. The button is pressed again within a first predetermined period after entering the multi-function entry state, corresponding to one command. The light indicator displays a second light status corresponding to the command. Finally, the button is pressed again to confirm the command within a second predetermined period.

Abstract: A method for controlling a sled-home operation in an optical disc drive by driving a sled motor. The method includes two stages: a motor-starting stage and a sled-home-driving stage. In the motor-starting stage, the sled motor is driven at a first target speed. In the sled-home-driving stage, the target of the sled motor is gradually changed to a second target speed greater than the first target speed. The second target speed is less than or equal to the speed Rm that corresponds to a maximum allowable excitation frequency for the sled motor to overcome a dynamic friction torque and greater than the speed Rs that corresponds to a maximum allowable excitation frequency for the sled motor to overcome a static friction torque.

Abstract: A disc drive, which inputs and outputs signals by an earphone jack. The signal processing circuit includes a digital-to-analog converter, a memory for storing firmware programs, a signal switch device, and an earphone jack coupled to the signal switch device. When the signal switch device is coupled to the digital-to-analog converter, an audio signal is output from the disc drive through the earphone jack. When the signal switch device is coupled to the signal processing circuit, a digital signal is input or output to/from the disc drive through the earphone jack.

Abstract: An electrostatic discharge protection circuit receives an electrostatic discharge current generated by a first printed circuit board and conducted to a first grounding line of the first printed circuit board. The electrostatic discharge protection circuit includes a flexible cable having a connecting line with one end connected to the first grounding line, a second printed circuit board including a fixed component, an electrostatic discharge protection path electrically connected between another end of the connecting line and the fixed component, and a second grounding line electrically connected to the fixed component.

Abstract: An electrostatic discharge protection circuit includes a first printed circuit board including a first grounding line, a flexible cable including a connecting line having one end connected to the first grounding line, an electrostatic discharge protection path having one end connected to the first grounding line, a second printed circuit board including a second grounding line electrically connected to another end of the connecting line, and a housing connected to another end of the electrostatic discharge protection path.

Abstract: A method of command entry for an electronic device. First, a single button is pressed to enter the electronic device into a multi-function entry state, indicated by a first light status. The button is pressed again within a first predetermined period after entering the multi-function entry state, corresponding to one command. The light indicator displays a second light status corresponding to the command. Finally, the button is pressed again to confirm the command within a second predetermined period.