Abstract: A printing device comprises an amplifying circuit configured to amplify a drive waveform signal, and an energy generating element. The energy generating element is configured to eject the liquid from a nozzle. The amplifying circuit includes a comparator of which the drive waveform signal is input to a positive input terminal, a gate driver, an output signal being input to the gate driver from the comparator, a first N-type MOSFET and a second N-type MOSFET. A drain of the first N-type MOSFET is connected to a power supply. A source of the first N-type MOSFET is connected to a drain of the second N-type MOSFET. The printing device comprises negative feedback wiring configured to connect a negative input terminal of the comparator to the source of the first N-type MOSFET and the drain of the second N-type MOSFET.

Abstract: A printing apparatus includes a first digital synthesizer configured to generate a first basic analog synthesis signal by synthesizing n (n is a natural number greater than or equal to 2) pieces of digital data, which indicating driving waveforms used to drive an energy generating element to cause a nozzle to eject liquid, and converting the same an analog signal, the n being a natural number greater than or equal to 2, an integrated signal synthesizer configured to generate an integrated analog signal by synthesizing the first basic analog synthesis signal and one or more analog waveform signals, and a separator configured to separate one of a driving waveform signal indicated by one of the n pieces of digital data and driving waveform signals indicated by the one or more analog waveform signals from the integrated analog signal.

Abstract: There is provided print apparatus including: piezoelectric member; individual electrode; first and second common electrodes; voltage application circuit; detection circuit configured to detect a capacitance of a first capacitor configured by the piezoelectric member, the individual electrode, and the first common electrode and a second capacitor configured by the piezoelectric member, the individual electrode, and the second common electrode; first switching element; and control circuit. The control circuit is configured to execute: a first voltage application process to apply a first voltage to the second common electrode in order to discharge the ink; a detection process to detect the capacitance after electrically connecting the piezoelectric member and the detection circuit with the first switching element; and a second voltage application process to apply a second voltage to the second common electrode before the detection process, the second voltage being lower than the first voltage.

Abstract: There is provided print apparatus including: piezoelectric member; individual electrode; first and second common electrodes; voltage application circuit; detection circuit configured to detect a capacitance of a first capacitor configured by the piezoelectric member, the individual electrode, and the first common electrode and a second capacitor configured by the piezoelectric member, the individual electrode, and the second common electrode; first switching element; and control circuit. The control circuit is configured to execute; a first voltage application process to apply a first voltage to the second common electrode in order to discharge the ink; a detection process to detect the capacitance after electrically connecting the piezoelectric member and the detection circuit with the first switching element; and a second voltage application process to apply a second voltage to the second common electrode before the detection process, the second voltage being lower than the first voltage.

Abstract: An image processing apparatus has a normal mode and a power saving mode as a power consumption mode. In the normal mode in which an image processor requires electric power supply, a direct voltage output by an AC-DC converter is supplied to the image processor. A voltage according to a power feed request from an external device connected to an USB connector is output by a variable output DC-DC converter via a power-feed terminal. In the power saving mode in which the electric power supply for the image processor in unnecessary, the voltage according to the power feed request from the external device connected to the USB connector is output by the AC-DC converter without routing through the variable output DC-DC converter.

Abstract: An image processing apparatus has a normal mode and a power saving mode as a power consumption mode. In the normal mode in which an image processor requires electric power supply, a direct voltage output by an AC-DC converter is supplied to the image processor. A voltage according to a power feed request from an external device connected to an USB connector is output by a variable output DC-DC converter via a power-feed terminal. In the power saving mode in which the electric power supply for the image processor in unnecessary, the voltage according to the power feed request from the external device connected to the USB connector is output by the AC-DC converter without routing through the variable output DC-DC converter.