Abstract: An electronic device includes a casing defining a first opening and a through hole, a first antenna, a first cover, and a camera module. The first antenna is mounted in the casing and whose position corresponds to the position of the first opening. The first cover is detachably fixed in the first opening and covering the first antenna. The camera module is mounted in the casing and includes a lens module received in the through hole for converging light incident thereon. The first antenna and the camera module are arranged in a first line, the first cover being fixed in the first opening is separated from the camera module by a first predetermined distance in a first direction parallel with the first line.

Abstract: An electronic device includes a casing defining a first opening and a through hole, a first antenna, a first cover, and a camera module. The first antenna is mounted in the casing and whose position corresponds to the position of the first opening. The first cover is detachably fixed in the first opening and covering the first antenna. The camera module is mounted in the casing and includes a lens module received in the through hole for converging light incident thereon. The first antenna and the camera module are arranged in a first line, the first cover being fixed in the first opening is separated from the camera module by a first predetermined distance in a first direction parallel with the first line.

Abstract: A driving circuit comprising a reference-voltage circuit, an amplifier, an adjusting circuit, and a current-setting circuit. The reference-voltage circuit is used for generating a reference voltage. The amplifier comprises a first input terminal used for receiving the reference voltage, a second input terminal used for receiving feedback voltage from a load, and an output terminal used for outputting an output current to the load. The adjusting circuit is used for adjusting a voltage of the load when a resistance of the load changes. The current-setting circuit is used for setting a value of the output current based on the feedback voltage.

Abstract: A driving circuit comprising a reference-voltage circuit, an amplifier, an adjusting circuit, and a current-setting circuit. The reference-voltage circuit is used for generating a reference voltage. The amplifier comprises a first input terminal used for receiving the reference voltage, a second input terminal used for receiving feedback voltage from a load, and an output terminal used for outputting an output current to the load. The adjusting circuit is used for adjusting a voltage of the load when a resistance of the load changes. The current-setting circuit is used for setting a value of the output current based on the feedback voltage.