Abstract:
A battery testing apparatus includes a charge circuit, a discharge circuit, a computer, and a control circuit. The charge circuit is coupled to a direct current (DC) adapter, the DC adapter charges a battery through the charge circuit. The discharge circuit is coupled to the battery and configured to discharge the battery. The computer records charge/discharge time and charge/discharge cycles of the battery, and calculates capacity and cycle life of the battery according to the time and cycles of charge and discharge. The control circuit has an input terminal coupled to the computer, and a plurality of output terminals respectively coupled to the charge circuit and the discharge circuit, the control circuit controls the charge and discharge circuits charging and discharging the battery.
Abstract:
A voltage test circuit for testing a computer power supply includes a voltage input unit configured for receiving voltages from the computer power supply, a voltage output unit configured for outputting the voltages to a plurality of electrical loads, a test unit, a switch control unit, and a capacitive load module. The test unit is connected between the voltage input unit and the voltage output unit for testing output ripple and noise of the voltages. The capacitive load module includes a plurality of capacitive loads. The switch control unit is connected between the voltage input unit and the capacitive module for selecting a suitable capacitive load according to the computer power supply.
Abstract:
A system for testing power supply performance is provided. The system includes a power supply having a plurality of outputs for outputting voltages, a plurality of display units corresponding to the plurality of outputs, for reflecting performance of the power supply, a plurality of resistance-matching selectors corresponding to the plurality of outputs, for supplying selective resistance, a voltage adjustable direct current source, and a selective switch. The display units are connected between first terminals of the outputs and the resistance-matching selectors, respectively. The resistance-matching selectors are in turn connected to ground. The voltage adjustable direct current source has a pole selectively connected to a second terminal of one of the outputs via the selective switch, and another pole grounded.
Abstract:
A fragrance emitting apparatus includes a case, a heat conducting board mounted in the case, a fragrance container disposed in the case and contacting the heat conducting board, a heater disposed in the case and contacting the heat conducting board, and a temperature control apparatus connected to the heater and configured to control the heater to heat the heat conducting board according to the temperature thereof.
Abstract:
A system and a method for playback test of an audio device. The method includes the steps of: controlling an audio analyzer (3) connected to a host computer (2) to generate analog audio signals at different sampling frequencies, different sampling bit width and different signal amplitude, and controlling the audio analyzer to output the digital audio signals to a client computer (5) connected to the audio analyzer via an analog signal output interface (310); receiving the analog audio signals and converting the analog audio signals into first digital audio signals by a first sound card (6) to be tested inside the client computer; outputting the first digital audio signals to a digital signal input interface (311) of the audio analyzer; and controlling the audio analyzer to test and analyze the digital signals received at the digital signal input interface, and producing a test result.
Abstract:
A backlight module includes a light source and a light guide plate. The light guide plate has a side surface adjacent the light source for entry of light beams from the light source, a bottom surface perpendicular to the side surface, a plurality of identical protrusions formed on the bottom surface, and a reflecting film plated on the bottom surface and the plurality of identical protrusions. The identical protrusions diffuse the light from the light source out of an upper surface of the light guide plate, which is opposite to the bottom surface. The reflecting film reflects the light leaking from the bottom surface back to the light guide plate.
Abstract:
An exemplary monitor includes an LCD, a supporting frame, and a base receiving an optical driver, a power circuit, and a USB hub therein. The LCD is mounted on the supporting frame, which is mounted to the base, the power circuit is configured for providing power to the LCD and the optical driver, the optical driver is connected to the USB hub through a first USB cable, the USB hub is connected to a port of a computer through a second USB cable.
Abstract:
An audio circuit arranged in a display includes an audio input connector configured to connect to an audio output connector of a computer to receive audio signals therefrom, an audio input circuit receiving the audio signals, an audio amplifier circuit connected to the audio input circuit to amplify the audio signals, an audio output circuit outputting the amplified audio signals, a first output connector connected to the audio output circuit, a volume adjusting circuit, a micro control unit (MCU) of a motherboard of the display connected to the volume adjusting circuit, and a speaker connected to the first output connector. The volume adjusting circuit receives a control signal from the MCU to control the volume adjusting circuit to adjust the audio signals, and the speaker receives the adjusted audio signals.
Abstract:
An exemplary light-emitting keyboard includes an upper cover with a plurality of keystrokes, a printed circuit board, and a lower cover. The keyboard further includes a light guide plate, a reflector, and a light source. The light guide plate and reflector are arranged between the upper cover and the lower cover, and the light source is arranged beside the light guide plate and connected to the printed circuit board to get power. The light guide plate receives light beams from the light source and evenly distributes the light beams over the entire light guide plate through reflection and diffusion, and the reflector is disposed under the light guide plate for upwardly reflecting light beams from the light source to the light guide plate. Thus, the light-emitting keyboard can be used in a dark or gloomy environment.
Abstract:
An electronic time switch control circuit includes a power supply, an oscillation period control module, an oscillator, and a switch control module. The power supply supplies power to the oscillation period module, the oscillator, and the switch control module. The oscillation period module supplies periodic signals to the oscillator. The oscillator alternately outputs two kinds of control signals to the switch control module according to the periodic signals. The switch control module receives the two kinds of control signals, and correspondingly controls an electronic product to be turned on and off repeatedly.