okkk sir its working well i ll proceed further later on . please let me have a circuit diagram for a sensor which in presence of our palm in its vicinity will activate itself or say will produce pulses applicable ro the op amp inputs . i mean unlike touch switch any of the circuit must not be touch to trigger itself,just t needs the presence & no costly devices like PIR sensor i need here . we already saw this application in automatic wash basins , now i need this for a very imp work , its too urgent sir simultaneously with all my work . . please help