Abstract: A three-dimensional printing apparatus including a swing tank containing a liquid formation material, a swing mechanism, an elevating platform, a light source and a control unit is provided. The swing tank includes a pivot side and a swing side adapted to be swung about the pivot side. The swing mechanism includes a cam and a driving motor. The cam leans against the swing side for swinging the same. The elevating platform and the light source are respectively disposed above and below the swing tank. The control unit controls the elevating platform to immerge into the liquid formation material. The light source cures the liquid formation material between the elevating platform and the bottom of the swing tank. The control unit then controls the swing mechanism to swing the swing side, so the cured liquid formation material is separated from the bottom and located on the elevating platform.

Abstract: In an electronic audio signal processor suitable for electrical instruments such as electrical guitars, there is provided an improved pre-amplifier and compressor circuit which compresses the amplitude level of an inputted audio signal so as to provide lower noise better weak note recovery and improved high end boost, for low volume signals when the output thereof is fed through a distortion amplifier. The compressor circuit includes an op amp and feedback FET transistor.

Abstract: A heated revolving ironing cylinder is affixed with a flexible ironing bed drawn taut against the polished revolving cylinder surface functioning to efficiently iron and dry laundry work pieces in a single pass through the ironer. The ironer is comprised of a feed conveyor system delivering laundry work pieces to the top of the revolving ironing cylinder. The flexible ironing bed features holes and anti-friction and anti-static materials to provide a dry, highly polished, static-free laundry work piece. Further ironing efficiency is gained by reduced roller maintenance by means of a roller and air cylinder cooling system.