Abstract: An acoustic signal generator, and a method for generating an acoustic signal are described. The acoustic signal generator has a membrane that can oscillate, a deflection sensor for detecting any deflection of the membrane, an exciter configuration that is coupled to the membrane, and a power semiconductor switch with a load path that is connected to the exciter configuration. The switch has a drive connection. A drive circuit has a first connection connected to the drive connection of the power semiconductor switch and at which a drive signal is available. The drive circuit further has a second connection, to which the deflection sensor is connected.

Abstract: A connecting lock and a sheet pile wall, wherein the connecting lock has a straight end and a curved end which are arranged on one side of a center piece, and a hook-shaped end which is arranged on the other side of the center piece. The hook-like end may be arranged directly across from the straight end or the curved end.