Abstract: Coil patterns are provided in layers of a board to be wound in a same direction. The coil pattern is wound outwardly in a last layer on a rear-most side and in each even-numbered layer. The coil pattern is wound inwardly in each odd-numbered layer other than the last layer. An inner end portion of the coil pattern in each odd-numbered layer is connected to an inner end portion of the coil pattern in an adjacent back-side layer. An outer end portion of the coil pattern in each even-numbered layer, and an outer end portion of the coil pattern in an adjacent back side layer or an inner end portion of the coil pattern in the last layer are connected by the individual inter-layer connection portion. Outer end portions of the coil patterns in a first-numbered layer and the last layer are connected to respective terminal portions.

Abstract: Provided is a signal output circuit capable of outputting a normal signal in accordance with an input signal, even when part of the circuit fails. A signal output circuit includes a CPU, a switching circuit, and an output terminal. The switching circuit includes: a first switching unit having a first switching element and a second switching element, and a second switching unit having a third switching element and a fourth switching element. The drain, source, and gate of each of the first and second switching elements are connected to a power source, drains of the third and fourth switching elements, and a first output port of the CPU, respectively. The source and gate of each of the third and fourth switching elements are connected to the output terminal and a second output port of the CPU.