Abstract: An electronic system comprises an automatic power control (APC) unit, an adjustment unit, and a calibration unit. The automatic power control (APC) unit receives a first input signal and a second input signal and generates an output signal. An adjustment unit coupled to the first input terminal of the APC unit generates a voltage offset according to an adjustment signal. The calibration unit provides the adjustment signal with a series of values. The calibration unit monitors the output signal until the output signal changes states.

Abstract: A hinge with variable torque is disclosed to include a first part, which has a shaft at one side thereof and recessed portions on the peripheral wall of the shaft, and a second part, which has a sleeve disposed at one side thereof and grooves on the inside wall of the sleeve. The sleeve is pivotally coupled to the shaft of the first part. A first contact area and a first friction force are produced between the peripheral wall of the shaft and the inside wall of the sleeve when the first part is turned to a first angle relative to the second part, and a second contact area and a second friction force are produced between thereinbetween when the first part is turned to a second angle relative to the second part.

Abstract: A portable computer includes a host body and a cover. In this case, the host body has a containing space and at least one electronic component. The electronic component is disposed in the containing space, and the bottom of the host body is formed with an opening to expose the electronic component. The cover is removable from the host body. The cover is disposed on the host body to cover the containing space.

Abstract: A touch pad module of a computer has a metal click plate to control its operation system. A plastic member is attached under the metal click plate to provide a suitable and comfortable click action. The plastic has a frame portion and two button portions. Two button portions are respectively connected with the frame portion by a rib and a suspension arm. The suspension has an U-shaped spring to provide a proper elastic force when it is bent by a click action.