Abstract: A control circuit for booting a number of devices in a certain order includes two delay circuits and three switch circuits, the first switch circuit and the first delay circuit receiving a power good signal and a voltage signal from a power supply unit and thus allowing a first device to boot and the first delay circuit outputting a first delay signal after a set time, to the second switch circuit and the second delay circuit, which repeat the process of the first delay circuit and switch circuit, to boot the remaining devices.

Abstract: A serial advanced technology attachment dual in-line memory module (SATA DIMM) device includes a circuit board. A storage chip is arranged on the circuit board and stores a first firmware. A memory is arranged on the circuit board and stores a second firmware. A control chip is arranged on the circuit board and connected to the memory, to read the second firmware from the memory and load the second firmware in the storage chip when the first firmware stored in the storage chip is damaged. The control chip is also connected to the storage chip, to control the storage chip to read or to write data.

Abstract: A keyboard includes a housing, a number of keys, a circuit board received in the housing, and a connecting port. The circuit board includes a main control unit, a key control unit, and an analyzing unit. The connecting port is configured for electrically connecting the circuit board to a main board of a computer. The main control unit includes a main controller. The key control unit includes a key controlling module electrically connected to the keys, and a processor electrically connected to the key controlling module through the main controller. The analyzing unit includes a display and an analyzing module. The analyzing module is electrically connected to the main controller and the connecting port, and is capable of reading breakdown information of the main board of the computer under the control of the main controller. The analyzing module displays the breakdown information on the display.

Abstract: A hot swappable memory motherboard includes a center processor unit and a memory unit. A button is set on the motherboard. Pressing the button, a signal is sent to the center processor unit to stop operating the memory unit.

Abstract: A serial advanced technology attachment dual in-line memory module (SATA DIMM) device includes a circuit board. A storage chip is arranged on the circuit board and stores a first firmware. A memory is arranged on the circuit board and stores a second firmware. A control chip is arranged on the circuit board and connected to the memory, to read the second firmware from the memory and load the second firmware in the storage chip when the first firmware stored in the storage chip is damaged. The control chip is also connected to the storage chip, to control the storage chip to read or to write data.

Abstract: A motherboard includes a connector, an identification module, a Serial Advanced Technology Attachment (SATA) signal module, a Universal Serial Bus (USB) signal module, and a selection module. The connector is used to determine compatibility and connect a SATA-type external device with a SATA connector and a USB-type external device with a USB connector. The identification module is coupled to the connector. The identification module outputs a first signal when the connector is coupled to the SATA-type external device and outputs a second signal when the connector is coupled to the USB-type external device. The selection module connects either the SATA signal module or the USB signal module to the connector as appropriate.

Abstract: When a measured current of a resistor is less than a preset current value after a device is inserted into a memory slot, a control chip and a storage chip does not receive voltages. When the measured current is not less than the preset current value and a count time reaches a preset time value, the control chip and the storage chip receive voltages, to read or write data. When measured current of the resistor is not less than the preset current value after the device is removed from the memory slot, the control chip and the storage chip receive voltages, to backup data. When the measured current is less than the preset current value and the count time reaches the preset time value, the control chip and the storage chip do not receive voltages.

Abstract: When a measured current of a resistor is less than a preset current value after a device is inserted into a memory slot, a control chip and a storage chip does not receive voltages. When the measured current is not less than the preset current value and a count time reaches a preset time value, the control chip and the storage chip receive voltages, to read or write data. When measured current of the resistor is not less than the preset current value after the device is removed from the memory slot, the control chip and the storage chip receive voltages, to backup data. When the measured current is less than the preset current value and the count time reaches the preset time value, the control chip and the storage chip do not receive voltages.

Abstract: A heat gun head includes a housing. The housing defines two rows of outlets in a front end surface of the housing. When the heat gun head operates, hot air in the housing flows out of the housing through the two rows of outlets.

Abstract: A power plug includes a main body and a rotating member rotatably connected to the main body. The rotating member includes a levering portion at a side of the point of rotation of the main body. The rotating member is rotated, to lever the power plug out of a power socket.

Abstract: A motherboard includes an interface and a switch module. The interface includes first to eighth pins used to connect a component object model (COM) connector or a registered jack 45 (RJ45) connector. The switch module is connected to the interface. The switch module is also connected to a serial communication bus and an Ethernet bus on the motherboard. The switch module is used to determine the type of a connector connected to the interface, and connect the connector to the serial communication bus or the Ethernet bus according to the determination.

Abstract: A draining apparatus for a keyboard of an electronic device includes a base for slantingly supporting the keyboard and a protecting film to be covered on the keyboard. The protecting film includes a waterproof sheet and a flange protruding up from edges of the waterproof sheet. The flange defines an outfall adjacent to a bottom end of the flange. In case liquid is spilled on the protecting film, the water may flow downward and islet out through the outfall.

Abstract: A control circuit for booting a number of devices in a certain order includes two delay circuits and three switch circuits, the first switch circuit and the first delay circuit receiving a power good signal and a voltage signal from a power supply unit and thus allowing a first device to boot and the first delay circuit outputting a first delay signal after a set time, to the second switch circuit and the second delay circuit, which repeat the process of the first delay circuit and switch circuit, to boot the remaining devices.

Abstract: A heat gun includes a canister, a first outlet pipe, and an assistant member. The canister includes a columnar sidewall bounding a receiving space and an installation board mounted in the receiving space. The assistant member includes a first vent pipe, and a second vent pipe communicating with the first vent pipe and slidably mounted to the first vent pipe. Top ends of the first outlet pipe and the first vent pipe extend through the installation board and communicate with an upper portion of the receiving space. Bottom ends of the first outlet pipe and the second vent pipe function as outlets of the heat gun.

Abstract: A draining apparatus for a keyboard of an electronic device includes a base for slantingly supporting the keyboard and a protecting film to be covered on the keyboard. The protecting film includes a waterproof sheet and a flange protruding up from edges of the waterproof sheet. The flange defines an outfall adjacent to a bottom end of the flange. In case liquid is spilled on the protecting film, the water may flow downward and islet out through the outfall.

Abstract: A circuit for testing a buzzer includes a microphone, an amplifier circuit, a microprocessor circuit, and a display circuit. The amplifier circuit is configured to amplify an analog signal from the microphone to an amplified signal. The microprocessor circuit determines whether a loudness and a frequency of the amplified signal are within proper ranges. The buzzer is qualified if the loudness and frequency of the amplified signal are within the proper ranges. The display unit displays the loudness, the frequency, and a test result.

Abstract: A control circuit for a display device includes a group of keys, a video graphics array (VGA), and a control unit. The VGA port is electronically connected to the display device via a VGA bus. The control unit is electronically connected to the group of keys, and is electronically connected to the VGA port via an inter-integrated circuit (I2C) bus. The control unit outputs control signals when at least one key is actuated, and then the control signals is transmitted to the display device via the VGA port.

Abstract: A multimedia projector includes a local area network (LAN) port, a storage system, a video playing module, a file activation module, and a projection lens. The LAN port is coupled to a peripheral apparatus to receive videos and files from the peripheral apparatus. The storage system stores the videos and the files. The video playing module reads the videos from the storage system, and plays the videos. The file activation module reads the files from the storage system, and opens the files. The projection lens projects the videos and the files accordingly.

Abstract: A drive circuit is used in an electronic device comprising multiple peripheral component interconnect-express (PCIE) slots. The drive circuit includes a motherboard, a first signal generation circuit, a second signal generation circuit, and a first delay circuit. The motherboard provides a control signal to the first signal generation circuit and the first delay circuit. The first signal generation circuit outputs immediate drive signals to first multiple PCIE slots. The first delay circuit outputs a first delay control signal to the second signal generation circuit after a predetermined time. The second signal generation circuit outputs drive signals to drive second multiple PCIE slots.