Abstract: A control circuit for controlling current through LEDs of an LED lamp includes a voltage regulator, a feedback circuit with an amplifier and a photo-resistor. The voltage regulator includes an output terminal connecting with the LEDs and a feedback terminal. The amplifier includes an in-phase input end coupling with an output end of the LEDs, an out-phase input end and an output end connected to the feedback terminal of the voltage regulator. The photo-resistor is connected between the out-phase input end of the amplifier and the ground. The photo-resistor has a resistance increasing along with a decrease of the light intensity of the LEDs. The increase of resistance of the photo-resistor is fed back to the voltage regulator via the amplifier, to thereby increase the electric current through the LEDs to maintain the light intensity of the LED lamp within an acceptable range.

Abstract: A fan controlling circuit for detecting rotational speed of a fan, includes a comparison circuit and a controlling chipset. The comparison circuit receives a rotational speed signal from the fan at one input terminal, a reference voltage at another input terminal, and outputs a filtered rotational speed signal at an output terminal. The controlling chipset receives the filtered rotational speed signal, and outputs control signals to control the rotational speed of the fan.

Abstract: A mold assembly includes a mold moving half, at least one heat sink positioned on the mold moving half, and a plurality of heat pipes positioned on the mold fixed half and on the at least one heat sink. The at least one heat sink includes a plurality of parallel fins. The plurality of parallel fins is secured to the heat pipes with the heat pipes passing therethrough. The heat pipes are capable of moving together with the mold moving half.

Abstract: A mounting apparatus for mounting a speaker to a computer case, includes a base plate assembled on the computer case, a fixing member configured to fix two corners on a top edge of the speaker, and an elastic sheet configured to fix a bottom edge of the speaker.

Abstract: An enclosure for an electronic device includes a chassis and a cover. The chassis includes a bottom wall and an opening. A circuit board is mounted on the bottom wall. The cover is mounted on the chassis to cover the opening of the chassis. A fixing apparatus is movably mounted on the cover. The fixing apparatus contacts and biases the expansion card toward the circuit board.

Abstract: A mold assembly includes a mold moving half, at least one heat sink positioned on the mold moving half, and a plurality of heat pipes positioned on the mold fixed half and on the at least one heat sink. The at least one heat sink includes a plurality of parallel fins. The plurality of parallel fins is secured to the heat pipes with the heat pipes passing therethrough. The heat pipes are capable of moving together with the mold moving half.

Abstract: A control circuit for controlling current through LEDs of an LED lamp includes a voltage regulator, a feedback circuit with an amplifier and a photo-resistor. The voltage regulator includes an output terminal connecting with the LEDs and a feedback terminal The amplifier includes an in-phase input end coupling with an output end of the LEDs, an out-phase input end and an output end connected to the feedback terminal of the voltage regulator. The photo-resistor is connected between the out-phase input end of the amplifier and the ground. The photo-resistor has a resistance increasing along with a decrease of the light intensity of the LEDs. The increase of resistance of the photo-resistor is fed back to the voltage regulator via the amplifier, to thereby increase the electric current through the LEDs to maintain the light intensity of the LED lamp within an acceptable range.

Abstract: An enclosure for an electronic device includes a chassis and a cover. The chassis includes a bottom wall and an opening. A circuit board is mounted on the bottom wall. The cover is mounted on the chassis to cover the opening of the chassis. A fixing apparatus is movably mounted on the cover. The fixing apparatus contacts and biases the expansion card toward the circuit board.

Abstract: A mounting apparatus for mounting a speaker to a computer case, includes a base plate assembled on the computer case, a fixing member configured to fix two corners on a top edge of the speaker, and an elastic sheet configured to fix a bottom edge of the speaker.

Abstract: A fan controlling circuit for detecting rotational speed of a fan, includes a comparison circuit and a controlling chipset. The comparison circuit receives a rotational speed signal from the fan at one input terminal, a reference voltage at another input terminal, and outputs a filtered rotational speed signal at an output terminal. The controlling chipset receives the filtered rotational speed signal, and outputs control signals to control the rotational speed of the fan.