The invention relates to a frequency converter for an immersion vibrator, comprising a mobile converter housing, and a converter circuit disposed in said converter housing and adapted to convert an electrical supply voltage to a special voltage. The converter is further provided with a feed line that is mechanically linked with the converter housing and electrically connected to the converter circuit. At the end of said feed line facing away from the converter housing a plug part is disposed. The converter circuit feeds a connector with the special voltage, a plug part of the immersion vibrator being insertable into said connector. A method of operating the immersion vibrator is also disclosed.