Negative Voltage generation using regulators

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@masab_ahmad: I don't think it works that way.First of all,these devices need an external component—a compensation capacitor at the output.
Why not using two 24V DC batteries connected in series with their mid-point connected to ground,so that you have +24V & -24V & then using 7915
 

I actually wanted to give + and - 5V to an op amp, and wanted to use 2 small cell phone batteries in series and later regulate the output to the op amps, so the circuit i posted above is not possible?
 

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