Op-Amps require dual polarity supply for their proper operation. When working with battery supply, it is difficult to get dual power supply from battery supply as it requires more steps and components. So, presented here a simple circuit that provides +/- 5V from few components.It is built around monolithic CMOS voltage converter IC ICL7660A (U2) and linear voltage regulator IC LM7805 (U1). ICL7660A is configured as voltage inverter to convert the positive 5V supply to negative 5V supply. The linear voltage regulator converts the 9V battery input into regulated 5V. The regulated 5V output from IC 7805 is given to pin 8 of IC U2.