thanks for the quick reply. my purpose for this is to replace an existing wall switch with some RC control switching (infrared, wifi, etc). but.. those conventional wall switches has only a live wire coming in... and an output wire going out connecting to the load. i do not have the intention of connecting any neutral wire to the device... because that would require extra wiring to the existing switch... yeah, in my sketch it acts exactly like a switch and i would want to know if there is a way to draw power from the live wire and converting it to dc power without lighting up the load ;D .... without the use of batteries or external power supply as it will require more space.