Abstract: The disclosure relates to a magnetometer in which direction of the Earth's magnetic field is determined on the basis of time variant differences in the inductance of a sensor coil of the digital compass which is a function of the orientation of the sensor coil with respect to the Earth's magnetic field. The magnetometer includes a sensing coil, a feedback resistor, and a comparator.

Abstract: Lighting devices for a vehicle arc disclosed that can include a light emitting diode and control circuitry for the light emitting diode. Also disclosed are circuits for a light emitting diode. Additionally, a method of forming a lighting device is disclosed. The lighting device, circuits, and method can be used, for example, to illuminate the interior of a vehicle.

Abstract: Lighting devices for a vehicle are disclosed that can include a light emitting diode and control circuitry for the light emitting diode. Also disclosed are circuits for a light emitting diode. Additionally, a method of forming a lighting device is disclosed. The lighting device, circuits, and method can be used, for example, to illuminate the interior of a vehicle.

Abstract: The present invention refers to a magnetometer (2) comprising a relaxation oscillator build up by a sensing coil (10), a feedback resistor (118) and a comparator (20), wherein an output node (107) of the comparator (20) is connected via the feedback resistor (118) to a first input node (102) of the comparator (20) and via the sensing coil (10) to a second input node (103) of the comparator (20), wherein the first input node (102) is controllable by an alternating first input signal (110) and wherein the second input node (103) is controllable by an inversely alternating second input signal (111).

Abstract: Lighting devices for a vehicle are disclosed that can include a light emitting diode and control circuitry for the light emitting diode. Also disclosed are circuits for a light emitting diode. Additionally, a method of forming a lighting device is disclosed. The lighting device, circuits, and method can be used, for example, to illuminate the interior of a vehicle.

Abstract: A constant temperature anemometer utilizes a fine wire or thin film sensor or probe and a pulse width modulated driver in a digital control loop to adjustably drive the probe to maintain its temperature at a nominally constant value and provide a digital output to associated metering or recording equipment. The pulse width modulated driver includes a clock, an RS flip-flop and a comparator. At the beginning of the clock cycle, power is provided to a voltage divider and the divided voltage drives one input of the comparator and the fine wire or thin film sensor. The other input of the comparator is maintained at a reference voltage. When the drive voltage to the hot wire or thin film sensor exceeds the reference voltage, the comparator provides a high logic signal to the RS flip-flop, resetting it and shutting off power to the sensor until the next clock cycle. The pulse width modulated drive signal may be utilized directly by an associated processor or computer.