Abstract: A digital camera includes a bezel and an extending ring. The bezel defines a circular-shaped recess, and N pairs of support arms are positioned on the inner sidewall of the recess. The N is an integer equaling or exceeding 2. Each of the pairs of support arms has different height and the two support arms in each of the pairs of support arms are symmetrically placed with respect to a central axis of the recess. The extending ring defines N?1 pairs of bar-shaped slots. An end of the extending ring contacts an end surface of one of the N pairs of support arms, and the N?1 pairs of bar-shaped slots are positioned corresponding to the other N?1 of the N pairs of support arms.

Abstract: A master/slave device system includes a baseboard, a master device connected to the baseboard, and at least one slave device communicatively connected to the master device. The baseboard provides a power source. A switch connects the power source and the at least one slave device. The switch is capable of being switched on when a predetermined time is reached. The at least one slave device is capable of automatically setting an address at the moment the switch is switched on. The master device is capable of identifying the at least one slave device using the address.

Abstract: A projector includes a projector body, a lens module with a lens, and a gear module. The lens module and the gear module are arranged in the projector body. The gear module is operable to adjust a height of the lens and keep an angle of the lens, in response to the gear module being rotated.

Abstract: A liquid crystal display (LCD) includes a graphic processor, a number of sensors, an optical signal collecting unit, a property saving unit, a property comparing unit, and a property setting unit. The optical signal collecting unit receives optical analog signals generated by the number of sensors, and converts the received optical analog signals into optical digital signals. The property saving unit saves a number of predetermined display properties and a number of predetermined optical signal ranges. The property comparing unit receives the optical digital signals and compares the optical digital signals with the plurality of predetermined optical signal ranges, and correspondingly selects corresponding predetermined display properties. The property setting unit receives the selected display properties and outputs the selected display properties to the graphic processor to adjust display properties of the LCD.

Abstract: A mobile phone battery includes a battery body and a protecting structure. The battery body includes positive and negative electric poles formed on a side wall of the battery body. The protecting structure is movably set on the battery body. The protecting structure includes a protecting piece. The protecting piece is operable to cover or expose one of the electric poles.

Abstract: A solar energy includes a charging control unit to output a number of charge voltages, a switch control unit, and a comparing unit. The switch control unit receives a break control signal and a charging control signal from the charging control unit to switch the charging control unit to charge the rechargeable battery, and receives a voltage detecting signal from the charging control unit to output a detect voltage corresponding to a charge voltage of the rechargeable battery. The comparing unit receives the detect voltage and correspondingly outputs a selecting signal to the charging control unit. The charging control unit determines the charge voltage of the rechargeable battery according to the selecting signal, and outputs a corresponding charge voltage to charge the rechargeable battery.

Abstract: A monitoring system applies to a long distance transmission. A number of data acquisition devices records still images and video as signals and converts the video signals into voltage signals suitable for transmission. A monitoring host connected to the number of data acquisition devices via a network cable for long distance transmission processes the voltage signals to show the video.

Abstract: A tablet electronic device configured to electrically connect to a portable electronic device is provided. The portable electronic device includes a first connecting interface and a processing module. The tablet electronic device includes a body and a touch panel. The body includes a second connecting interface connected to the first connecting interface. The touch panel is disposed in the body to generate a touch signal after a touch, and when the portable electronic device is connected to the tablet electronic device, the touch panel displays information of the portable electronic device.

Abstract: A monitoring system includes a controller, a number of input devices, a number of digital sensors, a number of analog sensors, a number of displays, and a number of alarms. Each input device includes a switching circuit, an input circuit, and a connector. The connector is connected to a digital sensor or an analog sensor. The switching circuit includes an n-channel metal-oxide-semiconductor field effect transistor (MOSFET), a p-channel MOSFET, a first resistor, and a second resistor. The input circuit includes an operational amplifier and a third resistor.

Abstract: An exemplary method for displaying audio/video includes the following. A network camera is zoomed at a first zoom ratio to capture video images, and audio signals transmitted from a first area are simultaneously received. The network camera is zoomed at a second zoom ratio, and simultaneously audio signals transmitted from a second area are received. The video images and audio signals corresponding to the sounds of the first area and the second area are stored. The audio signals of the first area with the video images captured at the first zoom ratio are synchronized, and the audio signals of the second area with the video images captured at the second zoom ratio are also synchronized. Selected of the video images and the corresponding synchronized audio signals are simultaneously played, as required by a user.

Abstract: A board-to-board connector includes a double plastic pin header connector and a supporting plate. The double plastic pin header connector includes two opposite positioning plates, and a number of pin headers arranged in two rows and extending through the positioning plates. The supporting plate is placed between the two rows of pin headers, with opposite ends of the supporting plate resisting against the corresponding positioning plates.

Abstract: A network camera includes a mainboard system and an audio/video capture system. The mainboard system includes a system-on-chip. The system-on-chip is configured for encoding video files captured by the network camera. The audio/video capture system includes an image sensor, a bus switch, and a voltage level switch. The bus switch is interconnected between the system-on-chip and the image sensor. The bus switch has an on state where the system-on-chip is electrically connected to the image sensor and an off state where the system-on-chip is not electrically connected to the image sensor. The voltage level switch is electrically connected to the system-on-chip, and has a high voltage level state and a low voltage level state. The system-on-chip is capable of sending instructions to turn the bus switch on or off according to the state of the voltage level switch.

Abstract: A chip adapter used to install a chip on a first chip arranging area of a circuit board includes a board. The size of the board has the same size as the first chip arranging area of the circuit board. Edges of the chip adapter define a number of gaps corresponding to first pads of the circuit board. A second chip arranging area of the same size as the chip is arranged in a center of the chip adapter. A number of second pads are arranged around the second chip arranging area of the chip adapter corresponding to pins of the chip. Each second pad is electrically connected to a sidewall of the corresponding gap of the chip adapter.

Abstract: A delay circuit used in a schedule controller includes a voltage detection unit, a timer, and a first electronic switch. The voltage detection unit receives an input voltage and compares the input voltage with a predetermined voltage. The timer is controlled by the voltage detection unit to calculate duration of an interval time. The first electronic switch is switched on or off under the control of the timer. When the input voltage substantially equals or exceeds the predetermined voltage, the timer calculates duration of the interval time, the timer generates and transmits a switch signal to the first electronic switch when the timing is reached, and the first electronic switch is switched on by the switch signal and provides an output voltage.

Abstract: A light-emitting diode (LED) control circuit includes a switch, a control signal generating circuit, a voltage conversion device, and N switching circuits. The voltage conversion device converts a first direct current (DC) power supply to a second DC power supply for supplying power to the control signal generating circuit. The control signal generating circuit outputs different control signals according to the switch to turn on or off the N switching circuits, thus power is supplied to corresponding groups of LEDs.

Abstract: A motherboard includes a power circuit, a system power supply, and a central processor unit (CPU). The power circuit includes a direct current (DC) voltage input terminal. A first control circuit receives a direct current (DC) voltage through the DC voltage input terminal and outputs a first control signal. A second control circuit receives the first control signal and outputs a second control signal to the CPU and output a third control signal. A switching circuit includes a number of switches. The second control signal controls the corresponding switches to be on or off. A voltage converting circuit receives the third control signal and converts the DC voltage from the DC voltage input terminal, and outputs the converted DC voltage to the system power supply. The CPU receives the second control signal and controls the motherboard operation.

Abstract: A lamp control circuit includes a first switch circuit receiving a voltage from a power supply after a control is turned on and outputs a first control signal, a count circuit receives the first control signal and outputs a second control signal, a gate circuit receives the second control signal and outputs a third control signal, a second switch circuit includes a number of electronic switches to receive the third control signal and controls the electronic switches to be turned on or turned off, and a lighting circuit including a number of light emitting diode (LED) groups. Each LED group includes an LED. When an electronic switch connected to an LED group is turned on, the LED of the corresponding LED group is lit. When an electronic switch connected to an LED group is turned off, the LED of the LED group does not light.

Abstract: An outdoor monitoring system includes a camera, a direct-current adapter, a solar cell unit and a power management unit. The power management unit includes a controller, a rechargeable power source, a first voltage detection circuit, and a second voltage detection circuit. The first voltage detection circuit detects a charging voltage of the solar cell unit for charging the rechargeable power source. The second voltage detection circuit detects an output voltage of the rechargeable power source applied to the camera. The controller selectively connects the rechargeable power source or the direct-current adapter to the camera according to the output voltage and connects or disconnects the rechargeable power source to the solar cell unit according the output voltage and the charging voltage.

Abstract: An illumination adjustment circuit includes a light sensitive unit, an amplification unit, a switch unit, and a light emitting unit. The switch unit includes a plurality of electronic switches with increasing threshold voltages. The light emitting unit includes a plurality of sets of light emitting diodes corresponding to the electronic switches. Each set of the light emitting diodes is connected to the amplification unit through one of the electronic switches corresponding thereto. The light sensitive unit detects the brightness of ambient light, outputting a first voltage to the amplification unit accordingly. The amplification unit amplifies the first voltage to a second voltage and outputs the second voltage to the switch unit, so that the electronic switches with the threshold voltages lower than the second voltage are turned on, and the set of light emitting diodes connected to the electronic switch becomes luminous.

Abstract: A fastener includes a cylinder and a draw hook. The cylinder includes a main body, two resilient arms extending from an end of the main body, and a flange extending from a circumference of an opposite end of the main body. A number of protrusions spaced in the axial direction of the main body extends from an inside surface of each of the resilient arms. The draw hook includes a post slidably received in the cylinder, a taper-shaped engaging portion extending from an end of the post and exposed out of distal ends of the resilient arms, and a handle extending from an opposite end of the post. A diameter of the engaging portion gradually grows larger along a direction away from the post.