500W Modified Sine Wave Inverter circuit which controlled by PIC16F628A. The MOSFET’s could be in parallel pairs for even more power. Just give each its own 470Ω gate resistor and a 22kΩ from each gate to source. The large 1000µF capacitor and 47Ω resistor used to clean up the voltage spikes coming from the transformer centre tap into the positive rail and protect the PIC from them.
Frequency is 13 Hz and 15Hz. Will be at frist damage MOSFET. hex FILE IS WRONG