I found only this one on the net, and this is not extrlay what I need
Electronics Experiments: Simple DC-DC Converter
I have to convert DC 220V to about 5-10V (i'm not shure extly what I need there, I will know only after my device will work)
Curent I do not care, device need very low curent , about 100mA, But it has to be as light as possible, so I cannot use usual transformer chemm ( It cannot be under 70g weight, and I prefere total weight under 50g).
So I prefere any scheme that I can use here.
p.s. I cannot use schemes without the transformer (like tiristor based) besouse of the safety.
thank u for all your unswers.