An improved variable capacitor includes main set main set part and preset part, wherein preset part composed of cover board, preset stator plate, preset moving plates, preset axle, preset film, preset earthing soldering piece and soldering piece. It features positioning bracket increased on cover board to make convenient positioning in installing preset stator plate and soldering piece, designing preset stator plate and preset moving plates in regulating capacitance to minimal without superposition, and to form one disengage spacing D, fan-shaped with height 0.05-0.3 mm on cover board to make preset stator plate close fitting on preset moving plates. Compared with current technology, said invention structure is more reasonable with more portably accurately positioning, more ideal preset capacitance, capable of furthest reducing even eliminating beaten noise. |