This is over simplified. You must remove the dephased square wave signal sources and replace them with a simple multivibrator. About the transformer im not really sure if the values are correct so be cautious when building because the secondary winding is 220V and that's shock hazardous whether its mains or inverter. Oh I almost forgot this is not sinewave inverter but square wave inverter so some more sensitive electronic things may not work properly with it. There's something weird though. After stabilising it seems to ve drawing 34W but the load is rated at 40W. Whats the deal with that?