Abstract: A sleep/awake circuit includes an infrared receiving/sending module, a micro-control circuit, and a bus control circuit. The micro-control circuit sends a command signal to the infrared receiving/sending module at predetermined intervals. The infrared receiving/sending module detects the presence or absence of a user and then sends a signal back to the micro-control circuit indicating a result. According to the result, the micro-control circuit exchanges data and clock signals with the bus control circuit. The bus control circuit then sends control signals to the computer to control sleep/awake states of the computer.

Abstract: A dual voltage switching circuit includes a first resistor and two transistors. Each transistor has a first terminal, a second terminal, and a third terminal. The first terminals are connected to a control terminal of a computer. The second terminals are connected to a standby power supply of the computer. The third terminals are connected to a power-on terminal of the computer via the first resistor. When the first terminals receive a low level signal from the control terminal, the first and second transistors are on, and the power-on terminal receives a voltage form the standby power supply via the first resistor.

Abstract: A power supply circuit includes a first resistor and a first capacitor. One end of the first resistor is connected to a system power. The other end of the first resistor is connected to the anode of the first capacitor. The cathode of the first capacitor is connected to a digital analog converter A (DACA) VDD pin of a north bridge on a motherboard. The system power provides a stable power signal for the DACA VDD of the north bridge via the first resistor and the first capacitor. Thereby the display no longer ripples when the resolution of the display is adjusted to a certain value.

Abstract: A DDC interface circuit includes a first NMOS transistor and a second NMOS transistor. The gates of the first and the second NMOS transistors are all connected to a 3.3V system power via a first resistor. The source of the first NMOS transistor is connected to a DDC_CLK pin of a north bridge. The drain of the first NMOS transistor is connected to a 5V system power via a second resistor, and also connected to an SCL pin of a VGA interface via a third resistor to receive an ACK signal. The source of the second NMOS transistor is connected to a DDC_DATA pin of the north bridge. The drain of the second NMOS transistor is connected to the 5V system power via a fourth resistor, and also connected to an SDA pin of the VGA interface via a fifth resistor.

Abstract: An IEEE 1394 device detecting circuit includes a south bridge chip, a control device, an IEEE 1394 interface, and a resistor. The control device includes a power reset pin, a bus reset pin, and a cable power pin. The control device is connected to the south bridge chip through the bus reset pin, which is further connected to the power reset pin. The cable power pin is connected to a direct current power through the resistor. The control device is further connected to the IEEE 1394 interface, which is connected to an IEEE 1394 device.

Abstract: A power supply circuit for a motherboard includes an input/output (I/O) controller, a power circuit providing a working voltage for the I/O controller, and a first resistor. The I/O controller includes an I/O controller voltage pin and an I/O controller case open detection (COPEN) pin. The power circuit includes an input, a first output, a second output, and a GND pin. The input of the power circuit is connected to a standby power supply; and the first output of the power circuit is connected to the I/O controller voltage pin. The second output of the power circuit is connected to the I/O controller COPEN pin via the first resistor; and the GND pin of the power circuit is grounded.

Abstract: An exemplary circuit for regulating a timing sequence of a computer includes a PWM chip, a north bridge, a converting circuit, and a CPU. The PWM chip is connected to a power supply via a first resistor, and sends out a PWRGD_VRD signal and three-phase voltage signals. The north bridge outputs a PWRGD_CPU signal according to the PWRGD_VRD signal. The converting circuit transforms the three-phase voltage signals to a Vccp signal. The CPU sends out a VTT_PWRGD signal based on the PWRGD_CPU signal, and receives the Vccp signal. Wherein the logic level of the PWRGD_VRD signal is pulled up by the resistor, causing the timing sequence of the PWRGD_CPU signal to advance, the timing sequence of the VTT_PWRGD signal is also advanced according to the PWRGD_CPU signal, the timing sequence of the VTT_PWRGD signal is in advance of the timing sequence of the Vccp signal.

Abstract: A motherboard power on circuit includes a switch connector, an impedance circuit, and a super I/O chip. The impedance circuit includes a first resistor, a second resistor, and a capacitor. A terminal of the first resistor is connected to the power on terminal of the switch connector. The other terminal of the first resistor is connected to the power on terminal of the super I/O chip, a terminal of the second resistor, and a terminal of the capacitor. The other terminals of the second resistor and the capacitor are connected to a power source and ground respectively.

Abstract: A dual voltage switching circuit includes an input terminal receiving a control signal, an output terminal, three transistors, and a Zener diode. The gate of the first transistor is connected to the input terminal. The drain of the first transistor is connected to a standby power and the gate of the second transistor. The drain of the second transistor is connected to a first system power and the gate of the third transistor. The sources of the first transistor and the second transistor are grounded. The drain of the third transistor is connected to the input terminal. The source of the third transistor is connected to a second system power. The anode of the Zener diode is connected to the standby power. The cathode of the Zener diode is connected to the output terminal. The output terminal selectively outputs the standby power or the second system power.

Abstract: An exemplary circuit for preventing unauthorized access to a phone includes three transistors, a zener diode, and a rectifier comprising two input terminals for receiving an AC voltage from the telecommunication office, a negative output terminal connected to the phone via a first resistor, and a positive output terminal connected to the phone. The anode and the cathode of the zener diode are respectively connected to the positive output terminal and the base of the first transistor. The collectors of the first and third transistors are connected to the base of the second transistor, which is connected to the positive and negative output terminals respectively via two capacitors. The collectors of the first and second transistors are connected to the positive output terminal respectively via a second resistor and a buzzer. Emitters of the three transistors are connected to the negative output terminal of the rectifier.

Abstract: A power supply circuit for a motherboard includes a first resistor, a second resistor, a Schottky diode, and a direct current (DC) voltage source. The Schottky diode includes a first anode, a second anode, and a cathode. The first anode of the Schottky diode is respectively coupled to terminals of the first and second resistors, another terminal of each of the first and second resistors is respectively coupled to a power supply and ground. The second anode of the Schottky diode is coupled to the DC voltage source, the cathode of the Schottky diode is coupled to a south bridge.

Abstract: A mounting apparatus for securely fixing an air freshener such as a fragrance bag includes a panel of a computer and a fixing box accommodating the fragrance bag. One end of the box is pivotably mounted to the panel, and the other end is detachably fixed to the panel. Because of the mounting apparatus, the fragrance bag can't drop from the fixing box even when the computer is moved.

Abstract: A voltage monitoring device includes a comparison voltage generating circuit for providing a comparison voltage, a comparator, an electronic switch, and an LED. The comparator outputs a control signal in response to a comparing result between the comparison voltage and a voltage output by a power supply. The electronic switch includes a first terminal receiving the output of the comparator, a second terminal connected to a reference voltage, and a third terminal connected to ground. The LED includes an anode connected to the reference voltage, and a cathode connected to the second terminal of the first electronic switch.

Abstract: A motherboard includes a printed circuit board having a first via and a second via, and an integrated circuit component having a first pin and a second pin. The integrated circuit component is mounted on the printed circuit board by inserting the first pin and the second pin of the integrated circuit component into the first via and the second via of the printed circuit board respectively, wherein the first pin and the second pin of the integrated circuit component are differently shaped in cross section, and the shapes of the first via and the second via are corresponding to the shapes of the first pin and the second pin. The electronic component cannot be mis-mounted on the PCB.

Abstract: A sleep/awake circuit includes an infrared receiving/sending module, a micro-control circuit, and a bus control circuit. The micro-control circuit sends a command signal to the infrared receiving/sending module at predetermined intervals. The infrared receiving/sending module detects the presence or absence of a user and then sends a signal back to the micro-control circuit indicating a result. According to the result, the micro-control circuit exchanges data and clock signals with the bus control circuit. The bus control circuit then sends control signals to the computer to control sleep/awake states of the computer.

Abstract: A method for writing data onto a boot-up compact disc includes the steps of: encoding an optional bootstrap program providing a plurality of boot-up functions; controlling a CD writer (13) to write the optional bootstrap program, drivers of a computer device and basic input output system (BIOS) codes (122) of the computer device onto the boot-up compact disc (15). A related system is also disclosed.

Abstract: An exemplary computer enclosure includes a chassis, a pair of fixing members, a plurality of slats, and an actuating member. The chassis includes a pair of first parallel panels, and a second panel perpendicular to the first panels. The first panels and second panel cooperatively define an opening therebetween. The fixing members are attached to the first panels. The slats are pivotably attached to the first panels to adjustably shield the opening. Each of the slats includes a gear shaft fixed to an end thereof. The actuating member includes a rack bar slidably attached to one of the first panels to mesh with the gears shafts. The slats are rotatable clockwise or anticlockwise. Thus, the opening may be adjustably exposed to control an amount of air entering the chassis for dissipation of heat.

Abstract: The present invention provides a method for testing a serial port. The method includes the steps of: creating a transmission loop by connecting pins of the serial port; defining testing parameters, and reference values corresponding to the testing parameters; importing a test file that comprises test data; transmitting the test data into the transmission loop according to the reference values of the testing parameters; acquiring actual values of the testing parameters during transmitting; receiving data from the transmission loop; comparing the transmitted data with the received data and comparing the actual values with the reference values of the testing parameters; and analyzing whether the serial port is in a good working condition according to comparison results. A related system is also disclosed.

Abstract: In one preferred embodiment, an indicating circuit for a computer includes a microcontroller receiving a plurality of signals from the computer, and transforming the signals into a plurality of control signals; and an indicator having at least two light-emitting diodes (LEDs), and controlled by the control signals, wherein the at least two LEDs have different colors. The at least two LEDs emit lights of various colors according to the various usage states of hard disk, or power states of the computer. So it is easy for users to see the states of the computer.

Abstract: An anti-theft structure for a mobile phone, the anti-theft structure includes a power device for providing a direct current (DC) voltage, an oscillator circuit receiving the DC voltage and producing an oscillating signal, an amplifying element being connected to the oscillator circuit to amplifying the oscillating signal and producing a high-voltage oscillating signal, and a power amplifying circuit being connected to the amplifying element for amplifying power of the high-voltage oscillating signal and producing a high voltage arc at an output terminal of the power amplifying circuit.