Abstract: Trim angle control apparatus configured to control a trim angle of an outboard motor including a prime mover, including: a detector configured to detect a rotational speed of the prime mover; an actuator configured to adjust the trim angle of the outboard motor; an operation member configured to be operated by a ship operator to input a change command for changing the trim angle; and an electronic control unit including a processor and memory. The memory stores a target value of the trim angle for each rotational speed range of the prime mover in advance. The processor is configured to perform: setting a target value of the trim angle based on the rotational speed; and controlling the actuator so that the trim angle becomes the target value. The setting includes changing the target value in accordance with the change command when the change command is input through the operation member.

Abstract: An amplifier circuit with favorable linearity is provided. An amplifier of the present invention is provided with an amplifier MOS transistor, a diode-connected transistor block for negative feedback source impedance constituted by series-parallel connection of the limited number (including 0) of the diode-connected MOS transistors and connected to a source side of the amplifier MOS transistor, and a diode-connected transistor block for load constituted by series-parallel connection of the limited number of the diode-connected MOS transistors and connected to a drain side of the amplifier MOS transistor. A voltage gain is configured to be determined by a ratio of the sum of source impedance of the amplifier MOS transistor and the impedance of the diode-connected transistor block for negative feedback source impedance to the impedance of the diode-connected transistor block for load.

Abstract: An amplifier circuit with favorable linearity is provided. An amplifier of the present invention is provided with an amplifier MOS transistor, a diode-connected transistor block for negative feedback source impedance constituted by series-parallel connection of the limited number (including 0) of the diode-connected MOS transistors and connected to a source side of the amplifier MOS transistor, and a diode-connected transistor block for load constituted by series-parallel connection of the limited number of the diode-connected MOS transistors and connected to a drain side of the amplifier MOS transistor. A voltage gain is configured to be determined by a ratio of the sum of source impedance of the amplifier MOS transistor and the impedance of the diode-connected transistor block for negative feedback source impedance to the impedance of the diode-connected transistor block for load.

Abstract: The object of the present invention is to provide the telemetering apparatus, which telemeters electric power, gas, and waterworks, for telemetering via a telephone network with an exchange, wherein the telemetering apparatus responds to the normal polarity inversion, the slow polarity inversion, and calling bell signal applied to the communication line therebetween upon starting or releasing of use of the communication line. To attain the above object, the telemetering appears according to the present invention comprises detection means for detecting a rising edge or falling edge of those polarity inversions and signal characterized thereby with reference to the respective predetermined voltage and the respective predetermined period, thus distinguishing one of these polarity inversions and signal from the others.

Abstract: The object of the present invention is to provide the telemetering apparatus, which telemeters electric power, gas, and waterworks, for telemetering via a telephone network with an exchange, wherein the telemetering apparatus responds to the normal polarity inversion, the slow polarity inversion, and calling bell signal applied to the communication line therebetween upon starting or releasing of use of the communication line. To attain the above object, the telemetering appears according to the present invention comprises detection means for detecting a rising edge or falling edge of those polarity inversions and signal characterized thereby with reference to the respective predetermined voltage and the respective predetermined period, thus distinguishing one of these polarity inversions and signal from the others.

Abstract: An off-hook signal and dial pulse generating circuit which has a smaller number of switching devices having a high withstand current characteristic and has a less surge voltage than up to now. A dial pulse circuit and a switch block circuit are connected in parallel with the output side of a full-wave rectifying circuit. The circuit comprises an impedance circuit and a first switch circuit to be turned on/off by a signal. The impedance circuit operates in a state where it has an inductance component in case that a signal synchronized with a signal is off and operates in a state where it has no inductance in case that the signal is on, and an electric current flowing therethrough is turned on/off by the first switch circuit. The circuit comprises a series circuit composed of second and third switch circuits. The second switch circuit is turned on/off in response to a signal synchronized with the signal (where this circuit is off when the signal is on).