Abstract:
The invention relates to the device for overvoltage protection containing between the pair of connection points L/N and N/L being connected at least one varistor (V1), which is through the thermal activation disconnectable from the protected electrical circuit, while between the pair of connection points L/N, N/L and the connection point PE of grounding there is connected the aerial discharge (2), and the device further incorporates a basic board (4) created as a printed circuit and containing electrically conductive layer forming at least a part of conductive connections between individual elements of the device. The varistor (V1) is with its one contact (K1) attached to the electric conductive layer of the basic board (4), and in the place of connection of outlet (K1) of varistor (V1) to electric conductive layer of the basic board (4) to the electric conductive layer of the basic board (4) by means of low-fusing joint (5) is attached the electric conductive breaking-off body (6), which is by means of electric conductive heat resistant link (8) connected to one outlet of the aerial discharge (2) and is coupled with the put off means (9).
Abstract:
An apparatus comprising a printed circuit board having a front side and a back side, and having therein a plurality of conductive layers, each conductive layer including one or more signal channels; a stub extending from the front side to the back side, the stub being electrically coupled to at least one signal channel; and an impedance matching terminal electrically coupled to the stub and to a ground. A process comprising providing a printed circuit board including a front side and a back side, and having therein a plurality of conductive layers, each conductive layer including one or more signal channels, and a stub extending from the front side to the back side, the stub being electrically coupled to at least one signal channel and being designed to receive a signal from a component attached to the printed circuit board; and coupling an impedance matching terminal to the stub and to a ground.
Abstract:
An optical device, such as a vertical cavity surface emitting laser (VCSEL) may be housed in a hermetic enclosure such as a transistor-outline (TO) can and form part of a transmitter optical subassembly (TOSA). The TOSA may be connected to a printed circuit board (PCB) with a flexible circuit. A heating element provided on the flexible circuit heats the hermetic enclosure to improve radio frequency (RF) performance of the optical device in cold ambient conditions.
Abstract:
A flexible liquid level sensor board assembly (100) for application with liquid level sending units (250) is presented. The liquid level sending unit (250) includes a stem (210), float (230), and a flexible sensor board assembly (100). The flexible sensor board assembly (100) is a distinct component of the sending unit (250) and as such is capable of repeated insertion and removal from the stem (210). The flexible sensor board assembly (100) is therefore ideal for existing/retrofit applications and new installations alike.
Abstract:
A second ground plane (18) has one end opposite to a connector (14), which end is connected to a first ground plane (17) by resistor connection means (41). Accordingly, it is possible to lower Q of resonance of the aforementioned ground structure by the resistor connection means (41) and to prevent generation of an intense electromagnetic field attributed to an electromagnetic field of a data processing circuit. Especially when the resistor connection means (41) has a resistance value identical to a characteristic impedance of the ground structure, the ground structure is terminated in a matched way and it is possible to assure prevention of generation of an electromagnetic field attributed to resonance.
Abstract:
An apparatus and method for altering a contrast of an as-manufactured LCD device is described. The LCD device (201) includes a contrast-setting circuit (100) and a printed circuit flex (203). During the assembly process, a shunt (101, 102, 103) around a resistor (Ra1, Ra2, Ra3) in a voltage divider subcircuit of the contrast-setting circuit extends onto a portion of printed circuit flex. Due to the shunt, the resistor is initially in a shorted state such that the resistor does not influence the contrast-setting circuit. During a stage of the assembly process, a current contrast of the liquid crystal display device is determined. If the current contrast deviates from an intended contrast, the portion (207) of the printed circuit flex is severed from the rest of the printed circuit flex such that the resistor becomes unshorted and thereby influences the contrast-setting circuit to provide a contrast closer to the intended contrast.
Abstract:
A suspended transmission line with an embedded signal channeling device includes a support layer and a conductor supported by the support layer between first and second plates each having a ground plane. The conductor includes a combined signal line and a plurality of discrete signal lines extending from the combined signal line. The discrete signal lines each transmit a portion of a signal transmitted on the combined signal line. A propagation structure is disposed between the first and second plates to substantially contain an electromagnetic field generated by the propagating signal.