There is provided a bias arrangement for an amplifier adapted to amplify a varying input signal, the arrangement comprising a control circuit arranged to adaptively vary a bias current to the amplifier in dependence on an envelope of the varying input signal. The attitude control assembly is coupled to a spacecraft body at a plurality of attachment points and at least one of the plurality of force sensors is integrated at each of the attachment points. Once the expansion device starts its operation, the electric rotating device is rotated by the expansion device and therefore the operational mode of the electric rotating device is switched over to the power generating mode. The counter electrode substantially covers the drain electrode, for shielding unexpected coupling effects on the drain electrode due to data signals on a data line driving other pixels of the liquid crystal display device. The electrical box assembly provides an electrical box that is fastened directly to a stud on one sidewall and braced against the drywall at both ends of the box on the opposite sidewall to securely hold the electrical box with respect to the wall. The actuator is located laterally outside the spring arms in such a way that it acts transversely in relation to the latter.