PEF is the newest non thermal technology for liquid and semi -solid food processing system. Based on previous researches, PEF has the advantage of maintaining better nutritional products, compared with the thermal system. PEF pasteurization requires a high voltage pulse generator that produces electrical shock. Some researches had been conducted to develop a geneator circuit which has high efficiency and pulse wave that can be used in the PEF technology. The circuit of a high-voltage pulse generator can be designed either from resistor-capacitor (RC) circuits or resistor-inductor-capacitor (RLC) circuits. The high-voltage pulse generator with high voltage transformer used in this paper wil be controlled by microcontroller ATMEGA 8535. The paper also explores the design of high-voltage pulse generator which is equipped with voltage regulation that can be set through the key pad. Constant high-voltage pulse frequency is applied and is controlled by ATMEGA 8535 microcontroller. Chamber is designed as a tube shaped chamber with a pasteurized apple juice capacity of 1.5 liters. The high voltage transformers used in this paper is a step transformer with a maximum output of 1000KV. The designed equipmet The expected to produce high voltage in range of 20KV to 100KV with an increase scale of 20KV. The examination result shows there was an error between the expected and the real output voltage from the device/equipment. The average error of this equipment is 5.41% and the smallest eror on 60KV output