First of all - Hi all
I do not know much about electronics and circuits. I know it's a bad way to start this post, but there's no hiding it.
Moreover that's exactly why I am here, because it seems to me, that what I have in mind is quite easy for a person that knows that s/he's doing.
OK so what I want to do is
1) have a switch (A)operating on the main 230V power line - like a light switch, but this switch would be one operated by another circuit of much smaller voltage - so when the low voltage circuit is closed by its switch (B) the high voltage circuit would be closed by the switch (A)
2) have a mean of transforming the 230V voltage into a much smaller voltage to power the low voltage circuit.
OK I hope I made it clear. Would you know how to do this? I would appreciate any help and would be very grateful for names of the particular parts I need to get.