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Increased use of ultrasonic energy in industrial applications has created a greater demand for ultrasonic frequency power supplies. Most of these power supplies are constructed with vacuum tubes as the conversion devices. However, power supplies, which are made with transistors operated as high-current switches,1 can be made higher in power conversion efficiency and more compact for the same power rating. Described in this paper will be the circuits which have been utilized in the generation of ultrasonic frequency power.