Abstract:
A board-mounted parallel circuit structure with efficient power utilization includes a first substrate, a first constant voltage layer and a second constant voltage layer. The first and second constant voltage layers are connected to a power supply respectively through two power connection points. The first constant voltage layer has at least one insulating zone. Each insulating zone has a light-emitting unit formed therein. One electrode of the light-emitting unit is connected to the first constant voltage layer, and the other electrode thereof is connected to the second constant voltage layer through a conducting wire. When the power supply outputs a low voltage to the first constant voltage layer, resistance values everywhere on the first constant voltage layer are identical. Accordingly, given any distance between a light-emitting unit and a corresponding power connection point, lighting efficiency of the light-emitting unit is not affected and effective power utilization can be ensured.
Abstract:
An illuminated keyboard module has a base, a film circuit membrane, a illuminator membrane, multiple supporting frames, multiple keys and multiple illuminator. The film circuit membrane is attached onto the base. The illuminator membrane is attached onto the film circuit membrane and has multiple wires. The multiple supporting frames are attached onto the illuminator membrane and are connected to the base. Each key is attached onto the top of a supporting frame and has a light permitting portion. Each illuminator is attached to the illuminator membrane under a key and electrically connected to the wires. The illuminator irradiates lights going through the light permitting portions of one key to provide satisfying illuminating effect.
Abstract:
The present invention discloses methods for manufacturing chip resistor networks, which are free from the short circuit owing to electron migration of the silver electrodes. In one embodiment of the present invention, a barrier layer is formed to prevent the silver electrodes from electron migration. In another embodiment of the present invention, copper or nickel electrodes are formed to replace silver electrodes. These methods for manufacturing chip resistor networks are the ways to solve the short circuit caused by electron migration of the silver electrodes.
Abstract:
A hand toll equipped with an illuminator has a conductive assembly settled within the handle to provide power to a lamp assembly which can lighten the operating end of the hand tool. A user can push a switch back and fort to operate the conductive assembly and in turn switch on/off the illuminator.
Abstract:
A purchase method with price negotiation is used for facilitating a real-time purchase transaction in a system providing a user with real-time price inquiry and price negotiation, which examines a consumer identity, a purchase record, a purchase quantity, a product category and so on and accordingly provides various recommended prices and purchase ways through a computer program and a database to facilitate a purchase transaction. According to the method, when a product has been selected, a user may choose one of a plurality of price negotiation modes (based on quantity, bundle, credit or direct quote) and initiate the price negotiation. Thereafter, the user may decide to complete or abandon the deal, and the price record is collected and saved in the database, serving as an immediate price for next purchase or as a future offer to the customer when the cost is met.
Abstract:
In a direct conversion receiver with zero-frequency intermediate frequency (IF) signal, the DC offset and 1/f noise of the IF signal is compensated by means of double-sampling. The first period of the doubling-sampling is a calibration phase, which stores the DC offset and the 1/f noise. The second period is a signal flow phase during which the stored DC offset and 1/f noise is connected in opposition with the IF signal to cancel the DC offset and 1/f noise.
Abstract:
The in-phase intermediate frequency signal and the quadrature intermediate frequency signal of a direct conversion FM receiver are applied to a mixer or multiplier serving as a detector, and the output of the mixer yields the demodulated FM signal.
Abstract:
A MOSFET can operate as a resistor by operating in the linear or ohmic region of the drain V-I characteristics. This region can be obtained by floating the gate of the MOSFET, when the dc current and the voltage drop are given. Multiple resistors can be duplicated (or mirrored) by sharing the same source and floating gate. The floating gate voltage can be simulated using a closed loop equivalent circuit. Alternatively, the gate voltage can also be derived from the given drain-to-source voltage and the given current in a feedback loop. With this adaptive MOSFET resistor, the minimum supply voltage can be as low as the sum of the BJT threshold and the complementary BJT saturation voltage, e.g. VCC≧VBE+Vsat (e.g. 0.8+0.15