Abstract: An automatic dose meter and control circuit arrangement of switching and of analog modes of operation, especially for ultrasonic therapeutic apparatus. The efficiency of ultrasonic therapy depends to a great extent on the dose received by the patient. The essence of the invention lines in that a signal proportional to the dose get by the patient is generated and processed, and the operation of an ultrasonic generator feeding the treatment head is controlled with this signal. The duration of the treatment is determined in the function of the dose get by the patient, in this way the dose will always be equal to the predetermined value. The automatic dose meter and control circuit arrangement can be realized in two different types: analog mode of operation and switching mode of operation.