im reallyin the act of making an inverter for a while but is square-wave using pwm ic but i want to start pure sine wave inverter,if i an get help from the forum how to proceed with it but not with double conversion cos i live in this part of the world where we import nearly everything and cost of importing is high so iwill use the bulky xfomers that is available or if u cant give me hint on how to mke a ferrite xfomers on my own thanks