For the circuit of opamp 741. we have to supply the dual power for it. How can I make a dual power supply from single. For example, make a (+9V)-GND-(-9V) from single 9V battery ?
Electronic – Making dual power supply from single for opamp
operational-amplifierpower supply
Best Answer
You can use the ICL7660. It takes a positive voltage (up to 12v) and generates the inverse:
Very easy to use, I've used it in several commercial products.
If the ICL7660 chip is difficult to find, you can also roll your own" charge pump inverter" using a 555 timer, which should be available anywhere, and a few extra components:
There are lots of variations on this circuit, not just for generating negative voltages but also voltage doublers and triplers too. Just do a Google search for "555 charge pump images".