Cleaning devices which use cleaning sheets affixed in traps are disclosed. A control signal is applied to the first coil within a control time interval to induce a first signal in the second coil, which is then detected. The phase-clipping circuit establishes a phase conduction angle that determines the RMS load voltage for the lamp and includes a transistor switch and a microcontroller that operates the transistor switch, where ONOFF periods of the transistor switch define the phase conduction angle. Fine-grain high density inter-layer vertical bus connections are used. The encoded values obtained from an input value encode an output value such that the output value cannot be recovered from any single encoded value. Therefore, the number of times that light cannot be received due to the agitation member is constant within one period.