Acquiring negative voltage without dual rail power supply

Hello everyone,

We are working with a circuit that implements a dual supply op amp with 5V as the positive rail and -5V as the negative rail. The circuit also needs a common ground. We have a power supply that only ranges from 0 to 12V. What is the best way for us to acquire the -5V that we desire?

We are using an LM7805 for the 5V, power supply is held at 12V for other uses.

Thanks,
Daniel

 

Check out this IC:

http://www.linear.com/product/LTC1044

 

http://forum.allaboutcircuits.com/threads/creating-a-virtual-power-supply-article.13678/

 

Here's another very good chip to accomplish what you want.