This power supply splitter circuit can divide the voltage of ± 5V only from a 9V battery. This circuit consists of three ICs. The first is IC ICL7660, these are monolithic, CMOS switched-capacitor voltage converters that invert, double, divide, or multiply a positive input voltage. Next is ICL7663 IC a positive voltage regulator. And the last ICL7664 for negative voltage regulator.
The oscillation frequency of the ICL7660 will be reduced with the external oscillator capacitor, so that it inverts the battery voltage more efficiently.