Convert 9v (or 12v) to +15v/-15v ?

[Thelonious]

Hi,
I want to build a layout that use a +15V/-15V power. But I don't have this type of power supply.
I have 9V or 12V power supply.
How can I convert 9V (or 12V) to +15v/-15v ?

Thanks for your help

[Silver Blues]

There is a layout on this site that uses a converter just like this. Here.

[Thelonious]

Thank Silver Blues.
Hadn't seen this layout.