How can i convert 220V to 9V without using transformer?
Use a switched mode power supply. They come in a a small and very light weight wall wart form factor, are cheap, easy to use, safe to operate and many people have one lying around from an old mobile phone charger.



Any other transformerless solution is possible, but can be potentially lethal; one should really respect those tiny little innocent-looking copper wires that come from a wall socket. With 1 rep and an empty profile, I don't feel confident I should explain you how to do a transformerless design, but maybe someone else is more fearless.