LM 7660 is a CMOS voltage convertor capable of converting a positive voltage in the range of +1.5 v – 10 v to the corresponding negative voltage of -1.5v to -10v using very few external components. Below is the schematic diagram for the same.
We can use this get +/-5v from different sources like from 9v battery. Adding LM7805 converter to a 9v battery or 9v power supply will reduce it to 5v as shown below.
Components
- IC1 – LMC7660
- IC2 – LM7805
- C1,C2 – 10μF 16V
- C3 – 470 μF 25V
- C4 – 2.2μF 16V
- Battery – 9v