Abstract: A circuit board includes a substrate, a first copper layer, a first solder mask, a second copper layer, and a second solder mask. The substrate has a first surface, an opposing second surface, and a conductive portion bypassing a laid-out circuit and passing through the first and second surfaces. The first and second copper layers are disposed on the first and second surfaces and connected to the conductive portion, respectively. The first and second solder masks are disposed on the first and second copper layers and provided with a first opening corresponding in position to a power component and a second opening for exposing the conductive portion and a portion of the second copper layer, respectively. Heat generated by the power component is transferred by the conductive portion to the second copper layer through the first copper layer and then dissipated to the outside through the second opening, better.

Abstract: The hand-held electronic device includes a central processing unit, a memory unit, a state-detecting unit, a state-determining unit, a main power supply unit, a standby power supply unit, and a power supply switching unit. After determining the presence of a fall state, the state-determining unit will output a fall instruction and which causes the central processing unit to enter a low current mode; meanwhile, the power supply switching unit monitors power output and continues to supply low-potential power. In case of a fall of the hand-held electronic device, the device and method protect operation data and reduce the otherwise power-consuming current. The less power-consuming current is conducive to the reduction of capacitance required for a backup battery. The low current mode is effective in reducing the time taken to recover the operation mode of the electronic device.

Abstract: A test device for testing a circuit board includes a base, a conveying platform, a driving unit, a connecting element, and a testing unit. The base has an operating space from above. The conveying platform is hinged to the base at a variable gradient, communicates with the operating space, and has thereon a carrier movable toward or away from the operating space as needed and configured to carry the circuit board. The driving unit is connected to the conveying platform and configured to drive the carrier to move. The connecting unit is connected to the conveying platform and the driving unit. The gradient of the conveying platform varies when the driving unit drives the carrier to move and thereby moves the connecting unit. The testing unit is movably disposed at the base and has at least one test terminal capable of approaching the operating space and testing the circuit board.

Abstract: A circuit board with double-sided universal circuit layout for laying out electronic components has a first side with a first circuit layout thereon and an opposing second side with a second circuit layout thereon; hence, the first circuit layout and the second circuit layout are disposed on the opposing sides of the circuit board, respectively. The first circuit layout and the second circuit layout feature electronic circuits having the same function, thereby allowing users to selectively install the electronic components at one of the first circuit layout and the second circuit layout as needed and still have access to the electronic circuits having the same function. A layout method for use with the circuit board with double-sided universal circuit layout is further introduced.

Abstract: A printed circuit board grounding structure for use with a communication apparatus is configured for use with a printed circuit board to contact a grounded casing and thereby form a grounded circuit capable of electromagnetic wave shielding. The printed circuit board ground structure includes a copper conductive layer and a plurality of solder contacts. The copper conductive layer is circumferentially disposed along the periphery of the printed circuit board. The solder contacts are disposed on the copper conductive layer and used for electrically contacting with the casing. The printed circuit board grounding structure prevents deterioration of electromagnetic wave shielding despite oxidation of the copper conductive layer. The circumferentially-disposed copper conductive layer blocks electromagnetic wave generated from inside the printed circuit board, prevents leakage of the electromagnetic wave, and ultimately prevents the electromagnetic wave from interfering with other electronic apparatuses.

Abstract: A method for laying out a printed circuit board for use in a gigabit-capable passive optical network includes the steps of providing a printed circuit board and laying out an analog circuit module, an analog-to-digital conversion module, a signal processing module, an optoelectronic transmitting and receiving module, and a power module on the printed circuit board. The printed circuit board has a first periphery and an opposing second periphery. The analog circuit module and the optoelectronic transmitting and receiving module are laid out at the first periphery of the printed circuit board. The power module is laid out at the second periphery of the printed circuit board. Electromagnetic wave generated by a power IC inserted in the power module does not interfere with data transmission taking place at the optoelectronic transmitting and receiving module. Furthermore, a printed circuit board for use with the method is proposed.

Abstract: A multiple-output clock source signal generator for use with a fiber-optic communication apparatus for multi-dwelling units (MDU) includes a piezoelectric crystal, an input capacitor, an output capacitor, and a buffer unit having output ends. The piezoelectric crystal, the input capacitor, and the output capacitor are connected to the buffer unit so as to form a feedback circuit whereby the piezoelectric crystal oscillates and generates clock source signals to be output from the output ends, respectively. The multiple-output clock source signal generator is advantageously characterized by low costs and multiple output.

Abstract: An electrical protection for mounting on a wire connector housing, wherein the wire connector housing comprises a fixed hole and a plurality of wire-lock apertures exposed on a top surface of the wire connector housing, and the electrical protection comprise an insulating body and an insulating protrusion located at bottom surface of the insulating body. The insulating body is used to cover the wire-lock apertures at the top surface of the wire connector housing, and the insulating protrusion is designed and constructed to fit into the fixed hole of the wire connector housing. The wire-lock apertures of the wire connector housing are all covered and insulated to prevent electrical shock from the electrical leakage through the exposed apertures.

Abstract: A carrier for transmitting a high frequency signal and a carrier layout method thereof are provided. The carrier includes a substrate, conducting wires and reference planes both formed on the substrate. The carrier layout method includes defining impedance and thickness of the carrier according to the high frequency signal and defining layout parameters according to the impedance and the thickness. The layout parameters include a conducting layer formed on the conducting wires, a coplanar waveguide encompasses both the reference planes and the conducting wires as a part thereof, roughness portions formed on the conducting wires, recessed portions formed on the conducting wires, and the substrate being a high loss tangent substrate. The layout is performed according to the layout parameters defined thereabove, so as to increase loss of the high frequency signal in transmission.

Abstract: A waterproof battery includes a casing having an opening; a battery body received in the casing; a connecting unit disposed in the casing, wherein the connecting unit has a circuit board electrically connected to the battery body and a connector electrically connected to the circuit board and protruded from the opening; and a waterproof adhesive layer for being affixed to and thereby connecting an inner surface of the casing and a bottom side of the circuit board so as to hermetically seal the opening. Accordingly, the waterproof battery is capable of preventing water or liquid from intruding into the battery body to cause damage thereto, that is, a built-in capacity to be water-free.

Abstract: A wireless network apparatus capable of illumination includes a casing, a motherboard, a prompting unit, and a light emitting unit. The casing has a light permeable portion. The motherboard is disposed in the casing for serving a networking function. The prompting unit is disposed at the motherboard and electrically connected thereto for generating a prompting signal in accordance with a status of the networking function being performed by the motherboard. The light emitting unit is disposed on the motherboard or in the casing and corresponds in position to the light permeable portion. The light emitting unit is powered by the motherboard and configured to emit light passing through the light permeable portion, thereby serving a lighting function. Accordingly, the wireless network apparatus provides home illumination, increases the value-added, and boosts consumers' willingness to buy and install the wireless network apparatus.

Abstract: A device and method for examining a USB port of a test apparatus are characterized in that before a functional test is performed, with the test apparatus, on an electronic product equipped with a USB interface, the device including a USB connector, a connecting unit, and an alerting unit is connected to the USB port of the test apparatus so as to examine the power supply status of the USB port of the test apparatus. Accordingly, the electronic product equipped with the USB interface is efficiently protected against damage which might otherwise arise from unstable power supply to or an error in the USB port of the test apparatus during the ensuing functional test.

Abstract: A waterproofing test device tests waterproofing performance of a unit under test (UUT). The UUT has thereon a test recess and an aperture. The aperture is hermetically sealed with a gas-permeable waterproof element. The waterproofing test device includes a carrying jig, a water-supplying unit, and a pressure-applying unit. The carrying jig carries the UUT and has a hermetic sealing portion and a gas-discharging through-hole disposed within the hermetic sealing portion. The water-supplying unit is disposed in the carrying jig and provided with a water outlet corresponding in position to the aperture of the UUT. The pressure-applying unit provides internal negative pressure for the UUT by discharging gas therefrom and tests internal pressure of the UUT. Further provided is a waterproofing test method for use with the device. Given the device and method, a waterproofing performance test can be performed on a UUT with an aperture or fissure by gas discharging.

Abstract: A cut-edge positioning type soldering structure and a method for preventing a pin deviation can prevent a plurality of pins of an electronic component from being deviated when the pins are soldered onto a printed circuit board by a solder, and each of at least two solder pads includes at least two cut edges, and the solder pads are installed in an alignment direction on the printed circuit board, such that the cut-edge positioning type soldering structure and the method for preventing a pin deviation can improve the efficiency of manufacturing processes and reduce the manufacturing cost.

Abstract: A hinge, configured to be stably positioned by a simple mechanism and advantageously characterized by ease of installation and uninstallation, includes a first connection member and a second connection member. The first connection member includes a first fixing unit and a support unit. The first fixing unit has a first fixing side and a connecting side. The support unit is connected to the connecting side, and has a cylindrical receiving chamber and a via in communication with the cylindrical receiving chamber. The via is penetrable by a rod-shaped tool. The second connection member includes a second fixing unit and a post connected to the second fixing unit. The second fixing unit has a second fixing side. The post is removably disposed in the cylindrical receiving chamber and has a positioning hole for receiving an end portion of the rod-shaped tool when aligned with the via.