Photovoltaic systems and related techniques are provided. A circuit comprises a first register, a second register, a memory, a third register, and a multiplier circuit. The weight and the elastic element are disposed on the axis of the tool bit and between an inner wall surface of the tool body and an outer wall surface of the cylinder in such a manner as to cover at least part of the outer wall surface of the cylinder in the circumferential direction. A bump electrode is formed on the aluminum electrode by a wire bonding method.