○  Following the tests and the studies we performed in the previous work period, we collected sufficient data to be able to improve the overall efficiency of the power inverter circuit that generates the cold plasma we use to obtain the biodiesel fuel. After studying the data we concluded that it's time to build a new and improved inverter circuit. During the construction, special attention was given to the manufacturing of the high voltage output transformers and to the selection of the best ferrite cores, thus ensuring an optimal power transfer to the cold electrical discharge ("cold plasma"), minimizing the losses. Figure 1 presents the block schematic of the new inverter circuit we built in this time period.

Figure 1. The block diagram of our improved inverter circuit.
The transformer marked with "Tr.1" on Figure 1 is an output transformer wound on ferrite core. It has a transforming ratio of 1 : 10. The other transformer, marked with "Tr. 2" (Figure 1) is an air cored transformer, also known as a "Tesla resonant transformer" or "Tesla coil". This transformer is tuned exactly to the switching frequency of the output power stage, built around the power transistors T1 and T2 (Figure 1). Figure 2 presents the mainboard of the inverter circuit, already mounted on the bio-diesel reactor's chassis.
Figure 2. The inverter's mainboard mounted on the chassis of the biodiesel reactor.