Abstract: A device arrangement includes an electronic device having a rechargeable battery and a power adapter which can be electrically coupled to the electronic device and has a converter circuit for producing at least one operating voltage (UB) for the electronic device from a supply voltage from a power supply system at a voltage output, wherein the operating voltage (UB) is a DC voltage, the voltage output of the electronic device and the power adapter can be connected to one another via at least one power supply line to transmit the DC voltage, and the electronic device has a monitor that monitors at least one state of the electronic device and/or of the rechargeable battery, a first controller that produces at least one control signal (S) as a function of the monitored state, and a first signal device that signals the produced signal (S) to the power adapter, which first signal device is designed to modulate a radio-frequency AC voltage signal which is associated with the control signal (S), onto the power suppl

Abstract: An electronic device (1), which can assume an operating state and at least one energy-saving state, with a power supply (7) that can be connected to a mains voltage, and an evaluation unit (4), which can control the electronic device (1) from the operating state into the energy-saving state and vice versa, wherein the evaluation unit (4) is connected to the power supply (7) in such a way that the power supply (7) can be turned off by the evaluation unit (4) for assuming the energy-saving state and can be turned on again for assuming the operating state, and the evaluation unit (4) can be supplied, at least in the turned-off state of the power supply (7), with energy from another electronic device, which is connected via a standard interface to the electronic device, and/or with energy from a capacitor and/or with energy from an accumulator and/or with energy from a solar cell.

Abstract: A device arrangement includes an electronic device having a rechargeable battery and a power adapter which can be electrically coupled to the electronic device and has a converter circuit for producing at least one operating voltage (UB) for the electronic device from a supply voltage from a power supply system at a voltage output, wherein the operating voltage (UB) is a DC voltage, the voltage output of the electronic device and the power adapter can be connected to one another via at least one power supply line to transmit the DC voltage, and the electronic device has a monitor that monitors at least one state of the electronic device and/or of the rechargeable battery, a first controller that produces at least one control signal (S) as a function of the monitored state, and a first signal device that signals the produced signal (S) to the power adapter, which first signal device is designed to modulate a radio-frequency AC voltage signal which is associated with the control signal (S), onto the power suppl

Abstract: For preserving and, thus, for extending the useful life of a picture tube of a picture tube screen device having a waiting state function. The filament current of the picture tube in the waiting state of the picture tube screen device is reduced by at least a slight percentage of an original filament current. Also, the picture tube is supplied with another video signal, in addition to an original video signal, that generates a beam current in the picture tube having a white image level that is at least a slight percentage of an original white image level generated by the original video signal.