As can be seen, two IC 4017 are cascadedto form an 18 pin sequencing logic circuit, wherein the each negative pulse or frequency from the IC 555 produces a shifting output sequence across each of the indicated outputs of the two 4017 ICs, starting from pin#9 of the upper IC upto pin#2 of the lower IC, when the. The above shown waveform is selected so that it is able to replicate the actual sinusoidal or sine waveform as closely as may be possible. An ordinary IC 555 astable is implemented here for creating the required clock pulses for feeding the cascaded 4017 ICs and for enabling the sequencing logic across their output pinouts. The R1, R2,and C1 associated with the IC 555 must be accurately calculated. The mosfets and the transformer of the above explained 1500 watt SPWM inverter circuit are the two elements which determine the total power output. For getting a 1500 watt.
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