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Abstract - In general, high-voltage plants are carried out with large and complicated circuits. As research develops, a more simple and efficient series is needed. The Flyback transformer (FBT) method is one method that is often used in generating high voltage with a low DC voltage source. The advantage of this method is to have a simple, efficient and easy to carry series. This circuit consists of a flyback transformer as its main component. This circuit also consists of an ATMega 328 microcontroller, IGBT, and several other supporting components. The initial voltage comes from the PSA which has produced a DC voltage, then it will be forwarded to the IGBT driver which has been given a frequency from the ATMega 328 microcontroller. IGBT functions as a high frequency switching. After that, IGBT which already has a high frequency will be forwarded to the flyback transformer to produce a high voltage, according to the duty cycle regulated by the potentiometer. Frequency and Duty Cycle will be displayed on the LCD. The application of this tool can be carried out on milk pasteurization systems, dielectrics for food ingredients, food sterilization, and air purifiers.