:) Here is Circuit 12 Volt to 220 Volt Inverter 500W.
http://circuit-electronic.blogspot.com/2007/04/12-volt-to-220-volt-inverter-500w.html
use Transister only. (No IC)
Easy to make PCB by Dry Film.
Negative Dryfilm Photo Resist Instruction for PCB prototyping.
http://eanic.blogspot.com/2007/01/negative-dryfilm-photo-resist.html
Good luck :)