Abstract: A fan assembly includes a case, a bracket and a fan module. The cage includes a ventilation plate. An installation portion and a positioning post are located on the ventilation plate. The fan module is secured to the ventilation plate and includes a bracket and a fan secured to the bracket. The bracket includes a body, a first sidewall, and a second sidewall. The first and second sidewalls are located on opposite sides of the body. The first sidewall defines a first receiving slot and a first positioning hole. The second sidewall defines a second receiving slot and a second positioning hole. The first positioning hole is aligned with the second positioning hole. An area of the first receiving slot is larger than that of the second receiving slot. The positioning post is engaged in the positioning hole. The installation portion is received in the first receiving slot.

Abstract: A base of a vending machine for holding a main body of the vending machine includes first holding poles, second holding poles perpendicularly connected to the first holding poles, and installation members secured in right corners between the first holding poles and the second holdings poles. The installation member includes an elastic installation portion and sidewalls. The second holding pole defines an installation hole, and the elastic installation portion is received in the installation hole. The sidewalls connect the first holding poles to the second holding poles to prevent the right corners from deforming.

Abstract: A lighting device includes a lighting unit, a control unit, and a brightness adjusting unit connected between the control unit and the lighting unit. The brightness adjusting unit includes an operational amplifier and a number of branch circuits parallel connected between the control unit and a positive input terminal of the operational amplifier. Each branch circuit includes a diode and a photoresistor. A reference voltage is applied to an inverting input terminal of the operational amplifier. The operational amplifier compares a voltage on the positive input terminal and the reference voltage, and output a voltage via an output terminal to the lighting unit according to a comparing result. The control unit further controls the diode to switch between a turned on state and a turned off state to adjust the sensitivity of the lighting device in response to user input.

Abstract: A test support apparatus includes a supporting mechanism supporting a product, a holding post pressed on the product, a positioning assembly, an operating member and a clamping member. The positioning assembly is attached to the supporting mechanism and the holding post. The positioning assembly includes a positioning member and a moving member. The moving member is attached to the holding post, and moveably relative to the positioning member to adjust a distance between the holding post and the supporting mechanism. The operating member is rotatably attached to the positioning member. The clamping member is rotatably attached to the operating member and rotatable relative to the operating member about a first axis. The clamping member engaged with the supporting mechanism, and the operating member is rotatable relative to the positioning member about a second axis to rotate the clamping member about the first axis to disengaged from the supporting mechanism.

Abstract: An output adjustment circuit includes a rectifier and filter circuit, a voltage drop circuit, a voltage output circuit, a PWM regulator, and a feedback circuit. The rectifier and filter circuit receives an AC voltage and converts it into a square wave signal. The voltage drop circuit includes a primary coil and a secondary coil. The primary coil is connected to the rectifier and filter circuit. The primary coil receives the square wave signal. The voltage output circuit is connected to the secondary coil. The PWM regulator is connected to the primary coil. The PWM regulator generates a pulse signal to turn on and turn off the primary coil periodically. The feedback circuit controls a duty cycle of the pulse signal to adjust a during time of the primary coil being on in a cycle. The primary coil transmits energy to the secondary coil according the during time.

Abstract: A mounting apparatus includes a securing plate and a mounting tray. The securing plate defines an opening and includes a bottom surface and a top surface opposite to the bottom surface. The mounting tray is used to secure input/output devices and includes a positioning portion and a resilient portion. The positioning portion is attached to the bottom surface. The resilient portion includes a resilient block clipped with a first edge of the opening. The resilient portion is deformable to disengage the resilient block from the first edge of the opening.

Abstract: In a method for driving a retina display of an electronic device, the electronic device includes a graphics input-output (I/O) driver, a video driver, a graphics engine, an I/O manager, and a video adaptor connected to the retina display. The graphics engine detects a retina resolution of the retina display and a standard resolution of an image currently displayed on the retina display, and analyzes a display ratio of the image displayed on the retina display according to the retina resolution when the retina resolution is greater than the standard resolution. The standard resolution is adjusted to the retina resolution according to an image compensation algorithm, and the video driver controls the video adaptor to display the image on the retina display according to the retina resolution and the display ratio.

Abstract: An exemplary external independent graphics device is capable of processing graphics data of a computer. The external independent graphics device includes a first thunderbolt port, a graphic processing unit, and a control unit. The external independent graphics device communicates with the computer via the first thunderbolt port. The control unit controls the first thunderbolt port to receive the graphics data from the computer, controls the graphic processing unit to process the received graphics data, and controls the first thunderbolt port to transmit the processed graphics data to the computer.

Abstract: A vending machine supporting apparatus includes a frame and a supporting assembly. The frame includes two first poles and two second poles connected between the two first poles. Each of the two first poles includes a first top piece and a first bottom piece parallel to the first top piece. The first bottom piece defines a first through hole. The first top piece defines a second through hole. The supporting assembly includes a supporting pillar and two fasteners. The supporting pillar includes a shaft portion and a map portion connected to the shaft portion. Each of the fasteners defines a securing hole. The two fasteners are located on opposite sides of the first bottom piece. The shaft portion is inserted in the first through hole, the second through hole and mounted in the securing holes of the two fasteners, and the map portion supported on ground.

Abstract: A connector assembly includes a first connector and a second connector. The first connector defines a plurality of inserting holes. A receiving slit defined between adjacent two of the plurality of inserting holes. The second connector includes a plurality of pins. A positioning piece is formed between adjacent two of the plurality of pins. The second connector is inserted in the first connector when the positioning piece is aligned to the receiving slit. The positioning piece abuts an outer portion of the first connector to prevent the second connector from being wrongly inserted in the first connector when the positioning piece is not aligned to the receiving slit.

Abstract: A mounting apparatus includes a case and a securing member. The case includes a bottom plate and a rear plate connected to the bottom plate. A mounting tray is attached to the rear plate and defines a receiving slot. The securing member, includes an inserting portion and a securing portion. The inserting portion is engaged in the receiving slot, and the securing portion is secured to an expansion card. The securing member is moveable in a direction that is substantially perpendicular to the bottom plate, to disengage the inserting portion from the receiving slot.

Abstract: A connector assembly includes a socket connector and a plug connector. The socket connector includes a first top plate and a second top plate. The plug connector includes a first bottom wall and a second bottom wall. The first top plate corresponds to the first bottom wall, and the second top plate corresponds to the second bottom wall. When the connector assembly is correctly assembled, pins extending from the plug connector are allowed to be fully received into inserting slots defined in the socket connector. When the connector assembly is incorrectly assembled, the first top plate abuts against the second bottom wall, blocking the pins from being fully received into the inserting slots.

Abstract: Electronic device and a method for backlighting a liquid crystal display (LCD) display to provide different display definitions, the LCD display includes a backlight unit composed of one or more backlighting blocks. The method determines a display definition of a video image and illuminates or turns off backlighting blocks of the backlight unit to display the video image accordingly. The video image is displayed in full screen by all backlighting blocks if the video image is an ultra high definition (UHD) image, and turns on a smaller number of the backlighting blocks to display the video image if the video image has other than UHD display definition. As such, the electronic device is controlled to save power consumption in different display definitions of the LCD display.

Abstract: A product delivery device includes a receiving tray. The receiving tray includes a bottom plate, a pushing plate, and a shielding plate. The pushing plate is toward the shielding plate, and the shielding plate is rotatably attached to the bottom plate. A product exit is defined in the bottom plate and is covered by the shielding plate. The pushing plate pushes a product onto the shielding plate. The shielding plate rotates to allow the product to drop out of the receiving tray via the product exit.

Abstract: A dispensing assembly includes a mounting plate with a plurality of openings, a rotatable shaft located adjacent to the mounting plate, a plurality of blocking plates pivotably attached to the mounting plate, and a plurality of jacking members attached to the rotatable shaft. Lengths of the plurality of jacking members are different from each other. When the shaft is rotated to an initial position, the plurality of jacking members disengages away from the plurality of blocking plates, and the plurality of blocking plates are received in the plurality of openings. When the shaft is rotated to a working position, the plurality of blocking plates is rotated out of the plurality of openings to positions slanted relative to the mounting plate by the plurality of jacking members. Slanting angles of the plurality of blocking plates relative to the mounting plate are different from each other.

Abstract: A dispensing device includes a cabinet and a dispensing module. The cabinet includes a bottom plate for holding a number of products and defines a product channel. The dispensing module includes a first blocking plate rotatably mounted to the cabinet. An obtuse angle is defined between the bottom plate and a direction of gravity. The first blocking plate is rotatable relative to the cabinet between an initial position and a dispensing position. When the first blocking plate is in the initial position, the first blocking plate blocks the products from sliding out of the product channel. When the first blocking plate is in the dispensing position, the product channel is open to allow the products to slide out of the product channel.

Abstract: A dispensing device for a vending machine includes a first sidewall, a second sidewall, and output plate. A product channel and an outlet are defined between the first sidewall and the second sidewall. The outlet is located on bottom of the product channel. The output plate is located on the outlet. The output plate is movable from the outlet. A first damping board extends to the product channel and is located on top of the outlet to dampen at least one vertically moving product.

Abstract: A charging circuit is used to charge a rechargeable battery. The charging circuit includes a voltage conversion unit and a leakage prevention unit. The voltage conversion unit converts a voltage of a power supply into a charging voltage of the rechargeable battery, and outputs the charging voltage to the leakage prevention unit. When the leakage prevention unit receives the charging voltage, the leakage prevention unit charges the rechargeable battery with the charging voltage. When the leakage prevention unit does not receive the charging voltage, the leakage prevention unit prevents a leakage of the rechargeable battery.

Abstract: A portable electronic device includes an earphone jack, a display, a video card, a switch, a conversion module, and a transmission module. The video card converts digital video signals into analog video signals and sends the analog video signals to the display. The switch generates a double-screen display signal in response to a user's operation thereon. The conversion module converts the digital video signals into analog audio signals in real time according to the double-screen display signal. The transmission module transmits the converted analog audio signals to another portable electronic device through a signal wire. Two ends of the signal wire plug into two earphone jacks of the two portable electronic devices, respectively. A display method is also provided.

Abstract: A vending machine includes a cabinet; a door, a bar, and a puller. The door is rotatable relative to the cabinet. The bar is mounted to the door. The puller includes a cylinder and a rod. The cylinder is fixed to the cabinet. A joint is attached to one end of the rod. The joint is slidable on the bar. The cylinder can draw the rod. The rod can pull the door relative to the cabinet.