Bandwidth reduction of amplitude andor phase components of relatively wide bandwidth composite signal. The front-end power stage and the back-end power stage of the lamp driving system are electrically isolated each other by an electrical isolator. The sorbent is mainly made of aluminum calcium carbonate. The second sounding part repeatedly collides with the first sounding part to emit sound when a spool rotates in the fishing-line reel-out direction. The electric motor case is attached to the housing and supports the stator.