Abstract. In this article will be shown the basic working principal of PMT (photo multiplier tube), how it operates and what are the best practices of powering them in order to achieve optimal operation. Here is presented how to calculate optimal capacitance for Cockcroft-Walton voltage multiplier circuit and how theoretically it affects the voltage drop and voltage ripple in the multiplier stages. Using that information a design procedures are shown in order to build a test prototype power source, controlled and stabilized by a MCU (micro-controller unit).

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